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1
Olivier, Stephen Chris. "Physiological and psychophysical factors in the rating of perceived exertion during uphill overground and treadmill running." Thesis, Rhodes University, 1989. http://hdl.handle.net/10962/d1015769.
Texte intégralRésumé :
The purpose of this study was to examine possible differences between the field and laboratory ratings of perceived exertion (RPE) when the performance and physiological measures for the two conditions were equated. Furthermore, the interactive effects of local, central and overall RPE were examined. Finally, the question of the potential effects of attitudes on RPE was addressed. Eleven well-conditioned adult male marathon runners voluntarily participated in the study. After a period of treadmill habituation, biographical and anthropometric data were collected. This was followed by a VO₂ max test and a speed-matching session at 70% of VO₂ max to determine overground running speed at 3.8% and 7. 5% grade. Subjects then completed an attitudinal questionnaire and ran 4km overground. Finally, the above test was repeated on the treadmill, with the gradient and running speed of the overground condition being replicated. Physiological measures and differentiated RPE were obtained during the final two sessions. There were no physical environmental, task characteristic or performance differences between the overground and treadmill conditions. No heart rate or VO₂ differences were observed between the two conditions, but VE was significantly elevated in the laboratory. Local and overall RPE were significantly higher in the laboratory than in the field, but there was no difference for central RPE. Attitudes were more favourable towards the field than towards the laboratory work task. The results suggest that neither heart rate nor VO₂ are major factors directly influencing the perception of exertion. VE however appears to be a potent central signal mediating RPE. The results also indicate that local factors play a more important role in the perception of exertion than was previously thought. Attitudes towards a work task could possibly mediate the self-reports of exertion. The findings of this study also suggest that RPE are influenced by cognition to a large degree. Finally, environmental cues, or the ambience of a particular working environment, can exert a substantial influence on RPE. Direct perceptual translations from laboratory to field situations may therefore be invalid.
2
Rorke, Stafford Conroy. "The contribution of psychogenic factors limiting prolonged work performed at different relative intensities." Thesis, Rhodes University, 1986. http://hdl.handle.net/10962/d1004772.
Texte intégralRésumé :
This study investigated the physiological and psychological limitations to prolonged work performed at different relative intensities, through the use of an eclectic integrative methodology. Ten young male caucasian subjects (mean V0₂ max. 60,0 ml.kg⁻¹.min⁻¹ ± 7,9) were randomly exposed to treadmill runs at each of four relative intensities, namely 55%, 65%, 75% and 85% of V0₂ maximum, with the instruction to run to the point of subjective discomfort at which they were no longer willing to continue. Physiological measures of oxygen consumption (V0₂), heart rate (HR), respiratory exchange ratio (R) , minute ventilation volume (Vi), breathing frequency (Vf), tidal volume (Vt) and psychological measures of Ratings of Perceived Exertion (RPE), Perceived Thermal Comfo·rt (PTC), Perceived Pain and Perceived Fatigue were recorded throughout the protocol. The relative intensity was held constant by slight decreases in treadmill speed as subjects fatigued, and through feedback from an on-line oxygen consumption computer-aided data acquisition system. Significant increases in both physiological and psychological measures occurred with increases in relative intensity (p<0,05). HR and Vf increased overtime (p<0,05) whilst Rand Vt decreased over time (p < 0,05) . All psychological ratings increased in intensity over time (p < 0,05). Mean endurance times to exhaustion were 243 minutes ± 70 at 55% relative intensity, 159 minutes ±37 at 65%, 96 minutes ±25 at 75 % and 23 minutes +- 8 at 85%, being within the range reported by earlier researchers . A regression equation for prediction of endurance time given a known relative intensity was developed for this sample: % V0₂ max. = 117,8 + (-10,6 x LN (time)) (where r = -0,91) Convergence rankings indicate the greater contribution of local factors in the overall gestalt of perceived exertion, pain and fatigue, with biomechanical limitations to prolonged work (running) strongly implicated . High inter correlations between psychological rating scales suggest the use of the scale considered most applicable to the task at hand and the psychological response measure required. A coefficient of multiple correlation of 0,94 established the close interrelationship amongst the physiological and psychological parameters measured. Pre- and post-test Fatigue Cluster Analysis questionnaires indicated that the most important clusters contributing toward the sensation of fatigue and subsequent decision to cease activity were Task Aversion and General Fatigue (r = 0,96), followed by Leg Fatigue and Thirst. Motivation, the task at hand and an attainable goal appear to be important considerations in prolonged work performance. Relative intensity appears a valid tool for use in prolonged work studies due to its high predictive capacity for endurance performance times (r=-0,91). It is concluded that workloads considerably below 55% of maximal aerobic capacity are indicated as acceptable workloads for an 8 hour working day.
3
Blackwood, Susan Kim. "Aspects of fitness and physical activity patterns in Edinburgh school children." Thesis, Open University, 1997. http://oro.open.ac.uk/57657/.
Texte intégralRésumé :
There is growing concern that many children in Britain do not take sufficient exercise to benefit cardiovascular health. This is supported by extensive evidence advocating the importance of regular physical activity for lifelong health and well-being, and is of particular relevance in Scotland given it's notorious record of adult coronary heart disease death. This study examined aspects of fitness and physical activity in groups of Edinburgh school children, aged between 13 and 14 years. A three stage investigation was adopted: Phase One: A repeated measures, same subject design was used to examine the reliability and validity of selected measures (20m shuttle run test, peak oxygen uptake (V02 Peak), and anthropometric measures). Thirty three children (15 boys, 18 girls) performed each test on 3 separate days. Anthropometric measures showed strong reliability (r > 0.94, n=33) whilst reliability for the treadmill test ofV02 peak and shuttle run performance was lower (r=0.89 and r=0.79 respectively). Multiple regression analysis yielded a new equation for predicting V02 peak for children. This age specific prediction equation incorporated shuttle run performance in conjunction with skinfold thickness measures (Boys, R2=0.64 SEE=3.46; Girls, R2=0.79, SEE=2.81). Repeat testing was also recommended. Phase Two: An evaluation of methods of heart rate data analysis to assess physical activity in children. Twenty eight children (14 boys, 14 girls) wore continuous heart rate monitors (polar Electro PE4000, Finland) over a period of 7 days (Monday to Sunday), mean duration 737 (+/-55) mins/day. A detailed 7 day self report activity diary was also completed. Variability of heart rate measures was high (R=0.10-0.30), and it was noted that using data for just 4 days or less resulted in considerable underestimation of total weekly activity levels (44-100% error). If activity levels are to be compared against current recommendations, researchers must endeavour to achieve weekly rather than daily estimates of activity. Evaluation of methods of heart rate data analysis showed good correlation between heart rate activity indices and reported seven day activity. For boys strongest correlation was achieved using the number of 5 minute periods with HR > 139 b.min"l and the number of 5 minute periods with HR > 50% heart rate reserve (r=0.80, n=14). Total activity time was similar for both males and females but girls engaged in fewer sustained bouts of activity (>5 minutes) and a better correlate with activity in females was achieved using the total number of elevated heart rates (total HR > 50% heart rate reserve, r=0.64, n=14). Phase Three: A cross sectional survey was conducted to investigate standards of aerobic fitness and patterns of physical activity in groups of Edinburgh school children. Height, weight, skinfold thickness, shuttle run performance and physical activity (assessed by heart rate monitoring and activity diary) were recorded in a sample of 91 children (44 Boys, 47 Girls). Overall, males performed significantly better on the shuttle run test (t=5.4, df=88, p < 0.05), had higher predicted peak oxygen uptake (t=5.6, df=87, p < 0.05), and engaged in more bouts of moderate to vigorous activity than females. Seventy percent of boys and 50% of girls fulfilled current physical activity guidelines. Most activities were school based (131 mins per week as compared to 85 mins per week of out of school activities). Activity tended to be sporadic with active days interspersed with inactive days (mean 3.2 +/·1.6 days per week). After school activities specifically targeting young girls should be promoted.
4
Nustad, Jill K. "Changes in aerobic capacity following an endurance training program as a function of age." Virtual Press, 1991. http://liblink.bsu.edu/uhtbin/catkey/774742.
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The recent American college of Sports Medicine Position Stand concerning the quantity and quality of exercise for developing cardiovascular fitness (1) suggests a need for more information concerning the rate of improvement in aerobic power as a function of age. Therefore, the purpose of this retrospective study was to assess whether the change in maximal oxygen uptake (AVO2max) following endurance training varies as a function of age. Subjects were healthy men (N=277) and women (N=161), ranging in age from 20-72 years, who completed an endurance training program (= 3-5 months) between 1972 and 1987. The standard training stimulus consisted of individualized aerobic exercise (walking, walk-jog, or jogging) at about 75-85% maximal heart rate reserve for = 30-60 minutes, 3-4 sessions per week. A description of the %OVO2max expressed in relative and absolute terms, ± SEE are presented below.Variable20-29 yrs30-39 yrs40-49 yrs50-59 yrs60-69 yrsM 9/6AV02max ml•kg-1-min-'17.1 ± 13.220.0 ± 11.817.3 ± 13.319.5 ± 13.719.8 ± 9.1M%%OV02maxLmin-112.6 ± 10.616.0 ± 11.514.7 ± 11.616.6 ± 15.116.2 ± 9.8F °/oA VO2max mlkg''•min-'16.3 ± 9.022.5 ± 13.119.0 ± 10.917.6 ± 13.415.4 ± 6.8F%OV02maxL.min-'15.2±12.321.7±12.716.6±11.515.7±13.411.9±9.8N=Men women)20(17)87(54)112(51)46(30)12(9)A stepwise multiple regression analysis was used to assess the relationship between age and %OVO2max in both relative and absolute units, after adjusting for other parameters known to effect the training response. After adjusting for pre-training VO2max.(ml-kg-1-min-1) there was a significant negative correlation between OVO2max and age in both men (r = -0.31, p < 0.01) and women(r = -0.37, p < 0.01). When expressed as %OVO2max (L•min-1), the resultsrevealed the same age trend as that observed for the relative unit. Since the AVO2max after =3-5 months of training decreased as a function of age, this study supported the contention that training adaptations may be attenuated with increased age.<br>School of Physical Education
5
Lombard, Tamara Neubauer. "Improving physical activity adherence : the effects of self-control strategies, telephone prompting using lifestyle physical activity /." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-164730/.
Texte intégral
6
Matheri, Joseph Mwangi. "Physical inactivity among adolescents with physical disabilities attending high schools in Kenya." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3717_1258009225.
Texte intégralRésumé :
<p>Physical inactivity together with overweight and obesity has emerged as a major health risk factor for chronic disease of lifestyle as coronary heart disease, diabetes type 2, and hypertension affecting adolescents with physical disabilities in developed countries. This has contributed to the increase of social and economic costs of healthcare and social services in these countries. Review of literature has revealed that little has been documented about the status of adolescents with physical disabilities in developing countries. This study, therefore, aimed at establishing the degree of physical inactivity among high school adolescents with physical disabilities in Kenya.</p>
7
Maroun, Martin J. "Physical conditioning and nitric oxide production during exercise." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=35219.
Texte intégralRésumé :
Nitric Oxide (NO) has been detected in the expiratory air of normal animals and human subjects. Recent experiments revealed that expiratory NO production rises during exercise and correlates well with O$ sb2$ consumption and heart rate. Whether or not physical conditioning influences expiratory NO output production remains unclear. In this study, NO concentration in expired gas was measured in 18 healthy male volunteers subdivided into 3 groups (sedentary, intermediate, athletes) based on their state of physical conditioning. Measurements were taken at rest and during two steady-state exercise bouts on a bicycle ergometer designed to elicit VO$ sb2$ of 1 and 2 1/min with the athletes performing an additional bout at VO$ sb2$ of 4 1/min. In the sedentary and intermediate groups, expired NO concentrations declined significantly with increasing VO$ sb2.$ In contrast, expired NO levels declined only slightly with increasing VO$ sb2$ in athletes. At a VO$ sb2$ of 2 1/min, expired NO concentrations were significantly higher in athletes compared with the other groups. When correlated with V$ rm sb{E},$ expired NO concentrations declined linearly with the increase in $ rm V sb{E}$ in sedentary and intermediate groups but not in the athletes. Only the athletes had a significant linear increase in NO output (expired NO x V$ rm sb{E})$ with increasing VO$ sb2$ (p $<$ 0.001). These results support the notion that physical conditioning increases expiratory NO output during exercise. We speculate that the rise in expiratory NO output in athletes might be due to increased vascular and/or epithelial production of NO. Enhanced vascular NO production may be the result of increased shear stress and/or upregulation of endothelial NO synthase gene expression.
8
Zhong, Tao. "The causality orientations scale for physical activity : development, validation and initial application among Chinese adults." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/597.
Texte intégralRésumé :
Despite the compelling evidence that physical activity, especially regular physical activity plays a key role in enhancing health and well-being, many people remain physically inactive. To promote physical activity among the general adult population, identifying possible correlates is essential. In this regard, self-determination theory (SDT) with its motivational perspective may provide useful insight. This research examined the collective effect of the sub-theories of SDT (causality orientations theory, basic psychological needs theory, and organismic integration theory) on physical activity behavior explanation among Chinese adults. Given the lack of a measure for causality orientations in the context of physical activity behavior, an attempt was firstly made to develop and validate a psychometrically sound tool, namely the causality orientations scale for physical activity (COS-PA). The COS-PA was developed and validated in multiple phases. First, a scenario/item pool was created from multiple sources. Second, the pool was subjected to face validity, content validity, clarity, readability and comprehensibility appraisal. Adjustments were then made to finalize the initial scale. Third, the factorial, convergent and discriminant validity of the initial COS-PA were assessed via a series of exploratory factor analyses (EFAs), and correlated-trait, correlated-uniqueness analysis in the multi-trait, multi-method approach with two independent samples. The nomological validity of the scale was assessed by correlation analysis with theoretically linked constructs. In addition, the potential effect of social desirability bias of participants’ response to the COS-PA was checked. Fourth, the COS-PA’s reliability was evaluated using multiple methods, including Cronbach’s alpha coefficient, composite reliability and test-retest reliability. Subsequently, the proposed SDT process model (established based on the tenet of SDT and previous findings) was examined for physical activity explanation in an independent sample. Overall, the COS-PA exhibited sufficient validity and reliability in the multi-phasic tests. The proposed SDT process model, describing a motivational sequence whereby causality orientations and perceived autonomy support independently explain basic psychological needs satisfaction and behavioral regulation, which in turn explains PA behavior was partially supported. Moreover, potential indirect effects in the SDT model were examined. Although scale validation is an on-going process, these findings provide evidence for the COS-PA’s adequate psychometric properties and value for future use. Furthermore, the findings lead to a deeper understanding of the explanatory efficacy of the macro-SDT framework (i.e. the SDT process model) for physical activity explanation among the Chinese population. The findings highlight the positive roles of autonomy causality orientation and perceived autonomy support for basic psychological needs satisfaction, self-determined behavioral regulation and physical activity behavior.
9
MAUK, JACQUELINE KERN. "RELIABILITY AND VALIDITY ASSESSMENT OF THE EXERCISE SUITABILITY SCALE." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188035.
Texte intégralRésumé :
This study examined the reliability and the validity of the Exercise Suitability Scale (ESS). The ESS was a psychometric instrument developed to measure the suitability of four different forms of exercise (aerobics, bicycling, jogging, and swimming) for different individuals. Aspects of Exercise Suitability included in the ESS were ease, satisfaction, enjoyableness, fatigue, interest, convenience, comfort, safety, affordability, and time-involvement. Background information relating to the development of the ESS as well as methods and results of testing the instrument for reliability and validity were included in this study. Data from a student population were used for estimating the reliability and validity of the ESS. Reliability testing included computing inter-item and item-to-total correlation coefficients, Cronbach's alpha, and internal consistency coefficients (theta and omega) derived from factor analytic techniques. Several types of validity were assessed: content validity, criterion-related validity, and construct validity. Criterion-related validity was estimated by comparing scores on the ESS with information about participation in exercise. Multiple regression was also used to assess criterion-related validity. Principal components analysis was used to examine the construct and content validity of the ESS. Construct validity was also estimated by correlating ESS scale scores with a parallel instrumentation approach, a Q-Sort. Satisfactory reliability indices were obtained for all four ESS exercise scales. Criterion-related validity indices were also adequate. Factor analysis provided some evidence of content validity of the ESS, but provided little support for the construct validity of the ESS. Construct validity was supported, however by the convergence approach.
10
Hene, Nceba Mzimkulu. "Physical fitness of elite women's rugby union players over a competition season." Thesis, University of the Western Cape, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_6193_1305016359.
Texte intégralRésumé :
<p>The primary aim of this study was to investigate the changes in physical fitness characteristics of elite women&rsquo<br>s rugby union players over the duration of the season. Thirty two elite female rugby players who were identified as members of the South African Rugby Union High Performance Squad were assessed on three separate occasions (pre-season, mid-season and post-season) throughout the competition season. The players were sub-divided into two positional categories consisting of 17 forwards and 15 backs. On all testing occasions, players underwent anthropometric (stature, body mass and sum of 7 skinfolds) and physical performance measurements (sit-and-reach, vertical jump, 10m and 40m speed, 1 RM bench press<br>pull-ups<br>1 min push-ups and multi-stage shuttle run test). A two&ndash<br>factor analysis of variance evaluated differences in the physical fitness variables between and within playing positions over the competition season.</p>
11
Swartz, Ann M. "A comparison of the health and fitness benefits received with varying quantities of energy expenditure." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1115731.
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The Surgeon General's Report on Physical Activity and Health recommends expending 200 kcals "on most, if not all days of the week" (1000 to 1400 kcals/week) as a minimum quantity of exercise energy expenditure (EE) required to obtain health benefits. The ACSM recommends expending a minimum of 1000 kcals/week to receive fitness benefits. The purpose of this study was to evaluate the effect of EE above and below 1200 kcals/week on health and fitness benefits. Twenty-six previously sedentary males and females (mean age = 47 ± 2 years), with at least one risk factor for CAD completed the 22-32 week endurance exercise training study. Subjects performed an initial health screening and treadmill test which included measures of heart rate, blood pressure, blood lipids, body composition at rest, and metabolic data (V02, VE, RER) during the maximal treadmill test. Subjects began exercising with the Adult Physical Fitness Program at a self-selected amount of energy expenditure, recording heart rate, frequency, and duration of exercise on an exercise log card after every exercise session. After 22-32 weeks, subjects returned to the laboratory for a final evaluation identical to the first. The metabolic data from the initial and final tests, along with the data from the exercise log card was used to develop an estimation of energy expenditure/week. Subjects were then categorized into either < or > 1200 kcal/week energy expenditure. Results of the pre/post (n=12) training blood pressure, blood lipids, body composition and V02 __ measures were:EE <1200 kcalsEE >1200 kcalsVariablePre TrainingPost TrainingPre Training 'PostTrainingVO2.(L/min)2.287+.1982.397±.1983.064±.2073.290±.210VO2.(ml/kg/min)27.4+1.7-28.2+1.7-33.0+2.4-37.3±2.6 #HDL-C(mg/dl)51+4.355±4.547±2.850±3.2SBP(mmHg)121±4117±3124±4y120±37BMI(k g/m2)28.0±1.728.3+1.731.2+1.6730.0+1.5y #*p <0.05 training main effect, #p < 0.05 group by time interaction, y: n=14The group that expended above 1200 kcals/week displayed more improvement inrelative V02 n,.,., and BMI following the training program than the group thatexpended less than 1200 kcals/week. Furthermore, there was a training main effect showing adaptations in V02 ., HDL and SBP. In conclusion, previously at risk, sedentary individuals exercise training > 2 days/week can receive health and fitness benefits. However, those expending more than 1200 kcals/week will receive a greater benefit in terms of body composition and cardiovascular fitness.<br>School of Physical Education
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Artale, Lisa M. "The effects of physical activity on aging : a longitudinal analysis." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1115727.
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The purpose of this study was to examine the participants of the Ball State University Retirees Fitness (BSURF) program in order to determine the role that habitual participation in an exercise program plays on the aging process. The participants of the BSURF program were divided into two groups: those that have been exercising for seven or more years (LT; n=14), and those that have been exercising for six years or less (ST; n=10). Subjects underwent testing on the following variables: BMI, body composition, resting heart rate and blood pressure, blood lipid profile, biceps muscular strength, trunk flexibility, and the Rockport Walk Test. Group differences were determined using an independent t-test. Despite a significant difference in age and duration of participation time between the LT and ST groups, no statistically significant differences in cardiovascular measurements, anthropometric measurements, and body size were seen between the two study groups. The only exception to the positive effects of this exercise program on the aging process is demonstrated by the trunk flexibility data. The ST group was significantly more flexible (27.6 ± 1.51 cm) than the LT group (17.7 ± 2.67 cm). The results of this study suggest that continued participation in the BSURF program enabled the LT group to maintain their physiological functioning. Further, the length of participation by the members of the BSURF program clearly demonstrates significant adherence, and suggests that a program of moderate intensity in combination with a large social aspect may play a role in the exercise adherence of older adults.<br>School of Physical Education
13
Pochobradsky, Pavel. "Computerized system for time-motion analysis." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26306.
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Regular participation in sports is a common practice among the general population. For cardiovascular fitness, the frequency, duration, intensity and mode of the activity must be appropriate for the individual to benefit from the activity. The benefits for cardiovascular fitness are questionable in sports involving high intensity intermittent exercise of short duration. In the past, the procedures for determination of the heart rate and the time-motion characteristics of an activity were cumbersome and time consuming, thus making application to sports an inconvenience. The purpose of this project was to develop a computer based system for matching heart rate data with time-motion characteristics. The system was tested using ice hockey and squash. Subjects were observed during activity. The heart rate data during the activity were collected using a Polar Vantage XL Heart Rate monitor set to record heart rate values in 5-second intervals. The duration and type of activity were entered in the computer in real time using a coding system. Program combined the time-motion analysis with the heart rates that were downloaded from the Polar heart rate monitor. The results were summarized as follows: (1) total time at each intensity level, (2) mean duration at each intensity level, and (3) mean heart rate at each intensity level. Output from the computer program was similar to manual calculations.
14
Lee, Patrick Quinn. "Essays in occupational fitness and absenteeism." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25151.
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Occupational fitness programs have enjoyed enormous popularity over the course of the past decade. Their continuing penetration into all sectors of the business community coupled with the rapid growth of organizations serving professional fitness personnel, suggests that their presence may be permanent.
A major reason for the popularity of occupational fitness programs, is the claim that fitness programs can reduce employee absenteeism. Two important issues at this time are:
(1) the role of physical fitness in mediating sickness absence behavior, and,
(2) the role of participation in occupational fitness programs as a way of enhancing worker attendance motivation.
These issues fit in well with the Steers & Rhodes (1978) Process Model, a conceptual framework which deals with employee absenteeism from the standpoints of ability to attend (ie. high fitness) and motivation to attend (ie. high morale). The Steers & Rhodes theoretical model was chosen as an appropriate vehicle to guide this study. Part I reviewed the claim that physical fitness as a physiological state, is inversely related to sickness absence among employees. The literature review suggested that fit employees would miss fewer days from work than unfit employees. The prediction that physical fitness and sickness absence will be inversely related, formed the core of the hypotheses generated in Part I. In addition, hypotheses were also developed concerning the possible effects of gender, age, length of service and company affiliation.
Correlational analyses were performed on several physiological and absence variables obtained from a sample of employees from the years 1979 through 1984.
Modest but significant inverse correlations were found to exist between MVO₂ and a number of different absence measures. The magnitude of these correlations disappeared in some cases when the groups were controlled for gender.
Significant correlations were also found between variables such as length of service and absence or age and absence. Absence patterns for males and females and management and classified employees also showed significant group differences. These results point to the need to consider these personal and socio cultural variables when attempting to describe any relationships between occupational fitness and absenteeism. Part II chose the Steers & Rhodes concept of motivation to attend. Based on the review of literature, it was expected that participants in the company fitness program would report positive changes in a number of attitudinal and personal variables.
A simple questionnaire was developed to assess this change, and the entire population of a very large (n=1076) corporate fitness program was polled.
Respondents in the main, indicated a significant improvement in their personal perception of a number of different attitudinal variables. The magnitude of this improvement was significantly related to the length of time they have been members of the program and their degree of participation in the program<br>Education, Faculty of<br>Curriculum and Pedagogy (EDCP), Department of<br>Graduate
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Greene, J. Curtis. "The effects of a ten-week physical fitness program on fitness profiles, self-concept, and body-esteem in children." Virtual Press, 1993. http://liblink.bsu.edu/uhtbin/catkey/897492.
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The purpose of this study was to determine the effects of a 10-week physical fitness program on the fitness profiles, levels of self-concept, and body-esteem in 3rd- and 4th-grade low-fit children. The participants were 17 children (9 boys/8 girls) who failed to meet the Physical Best fitness standards in at least 2 of 3 fitness profile components, including cardiovascular endurance (one-mile run/walk), muscular strength and endurance (situps/min), and flexibility (sit and reach). All participants were pre and posttested in each of the three fitness profile components. Self-concept and bodyesteem were also pre and posttested using a shortened version of Harter's Self-Perception profile for children (SPPC) and the Body-Esteem Scale for Children (B-ESC).The treatment group (n = 10) participated 3 days/week for 60 min/day in a vigorous physical activity program designed to maintain heart rates corresponding to 60-80% of each individual's V02 max. An Analysis of Covariance revealed that the treatment group scored significantly higher (p < .05) on the posttest than the control group in two of the four self-concept dimensions (athletic competence and global self-worth) and on two of the three fitness profile components (muscular strength and endurance and flexibility). In light of the problems associated with increasing children's physical activity levels, offering after school programs such as this one appears to be an effective strategy.<br>Institute for Wellness
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Hulecki, Mary Beth. "The relationship between increased physical fitness and learning disabled children's self-concept, anxiety, and academic achievement." Virtual Press, 1988. http://liblink.bsu.edu/uhtbin/catkey/558374.
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The purpose of the study was to determine the relationship between increased physical fitness and learning disabled student's self-concept, anxiety level. and academic achievement. 34 learning disabled students in seventh arr. eighth grade (X age = 14 years, 7 months) were divided equally into comparison and treatment groups. For six weeks, the comparison and treatment groups maintained similiar class schedules with the exception that the treatment group was assigned to a physical education class where the students would partake in an aerobic exercise program (i.e. running and aerobics) and the comparison group remained in study hall. All 34 LD students were pretested and posttested using the 12 Minute Walk/Run Test. Piers-Harris Self- Concept Scale for_ Children, Revised Children's Manifest Anxiety Scale, and Wide Ranae Achievement Test-Revised.Four null hypotheses were tested using multivariate any, univariate analysis. The .05 level of significance was Mary Beth Hulecki Ed.D Ball State University, 1988 established as the critical probability level for the non acceptance of the statistical hypotheses.FindingsResults of multivariate analyses indicate: that no significant differences existed between the comparison and treatment groups on measures of IQ. self-concept. and anxiety. Results of multivariate analyses of pre-and posttest measures of the independent variable under study indicated that no significant differences existed between the comparison and treatment groups on measures of IQ. self-concept.and anxiety. Results of univariate analyses found no significant differences between the treatment and comparison groups after the physical fitness program on the independent measures of self-concept and anxiety level. Significant differences (p < .05) between the treatment and comparison groups were noted after intervention on measures of achievement and fitness. These results were observe: to be significant in the area of reading (p <.001).ConclusionsThe results of this study did not support theories that Suggested an increase in physical fitness Produced higher Self-concepts and decreased the anxiety level of learning disabled children. Although the LD students significantly raised their achievement scores, their anxiety level did not lessen and their self-concept scores were no higher after the running program. Several possible explanations are offered for consideration:1. Although achievement scores were higher after Intervention, they were still 2 or more standard deviations below the mean. These LD students were still functioning like mildly mentally handicapped students and were still far below the functioning level of their normal achieving peers. 2. As cited by other authors, LD students often try to portray themselves in a better light and do not accurately report their feelings.3. Underachievers were thought to respond unreliably on measures of self-concept.<br>Department of Special Education
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Hargens, Trent A. "Reliability of the double product break point measurement." Virtual Press, 1999. http://liblink.bsu.edu/uhtbin/catkey/1129627.
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The double product break point (DPBP) has been shown to occur in normal and cardiac subjects with values comparable to the ventilatory threshold (VT). The purpose of this study was to evaluate the intramodal and intermodal reliability of DPBP measurements during treadmill (TM) and cycle ergometry (C) exercise and to compare the DPBP to the VT. Seventeen subjects, (eight men and nine women) ages 18-60 (31.5 ± 12.4 yrs), performed four maximal exercise tests, two utilizing a standardized ramp treadmill and two utilizing an individualized ramp cycle protocol. A minimum of 48 hours separated each test. Double product (DP) was measured every 15 seconds during each test via the Kyokko Bussan CM-4001 automated blood pressure unit. Breath by breath analysis of gas exchange measurements were performed. The DPBP and VT was determined visually by three blinded observers (acceptance criteria being at least 2 observers agreeing within 10%). There were no significant intramodal differences in the V02 at the DPBP (ml'kg'1'min 1) for the two treadmill trials (23.8 + 4.9, 23.2 ±5.0) or for the two cycle trials (21.7 +7.2, 21.7 ±6.4). There was also no significant mean intermodal difference in the V02 at the DPBP for the treadmill and cycle (24.4 + 4.4, 23.1 + 5.8). Intramodal intraclass correlations for the DPBP were 0.84 and 0.79 for the treadmill and cycle, respectively. Intermodal intraclass correlation for the DPBP was 0.85. There were significant differences between the DPBP and the VT for both the treadmill (23.3 + 4.7, 28.2 ± 5.3)and the cycle (22.1 + 7.1, 27.5 ± 10.4). Correlations for the DPBP/VT comparison were 0.43 and 0.78 for the treadmill and cycle, respectively. In conclusion, results of this study suggest that DPBP measurements are reliable both intramodally and intermodally, however due to a wide range in correlations, the results suggest that the DPBP and VT are not occurring at similar V02 values.<br>School of Physical Education
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Wegner, Michael S. "The effects of a field learning trial and various methods of feedback in self-regulation of exercise intensity." Virtual Press, 1990. http://liblink.bsu.edu/uhtbin/catkey/722231.
Texte intégralRésumé :
This study was designed to assess the independent effect of a field learning trial, combined with various forms of exercise intensity feedback on the self-regulation of exercise intensity. Following a treadmill test, 42 males (21.8±2.7yrs) were randomly assigned to one of 3 exercise intensity feedback groups: heart rate (HR), heart rate + rating of perceived exertion (HR+RPE) or no systematic feedback (CONT). Half of the subjects in each group, were paced (P) to target heart rate (THR) during the first 800 meter field trial on day 1. Subjects in the non-paced (NP) groups completed the first trial at a self-selected pace. Following the first trial, subjects were instructed to exercise at their target intensity, and received the designated feedback after each of three 800m trials, on four days (D1-D4) within one week. Deviations (±bpm) from THR were recorded following each trial, and group means (S.D.) are presented below. Differences among groups were tested using a 3-way ANOVA (pacing x feedback x trials) with repeated measures across trials.GROUPDAY 1DAY 2DAY 3DAY 4P HR8.8(4.3)2.5(3.6)5.3(4.3)2.5(4.2)NP HR4.8(9.8)3.1(3.8)1.7(1.7)2.3(3.3)P HR+RPE6.1(6.6)1.3(6.4)2.8(5.8)2.1(3.4)NP HR+RPE9.0(9.0)6.9(6.6)4.3(8.0)3.6(5.7)PCONT5.7(5.9)2.9(12.3)5.4(8.8)2.4(13.5)NP CONT *21.67.316.38.416.010.914.17.5* NP CONT > all other groups on each day (p < 0.05)The pacing x feedback x trials interaction was not significant within any day. All groups increased accuracy from D1-D4, with most of the improvement being noted between D1 & D2 (p < 0.01). The addition of RPE (HR+RPE) feedback during the trials did not result in greater accuracy when compared to HR only feedback. Although both the P CONT & NP CONT groups improved across days, the P-CONT subjects were no less accurate than the groups using HR or HR+RPE feedback. Thus, a single 4-5 minute learning trial was as effective as the use of HR and perceptual feedback in the self-regulation of exercise training intensity in the field setting.<br>School of Physical Education
19
Figaji, Tamara Ann. "Impact of a lifestyle physical activity intervention on school going children's physical activity participation." Thesis, University of the Western Cape, 2009. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_6968_1297753030.
Texte intégralRésumé :
<p>Associated with physical inactivity and obesity are numerous other health risks which have become a major health concern. A steady decrease in the levels of physical activity during childhood and adolescents have been noted in various parts of the world. The picture of low physical activity levels in developed countries is no different in developing countries. Children spend the majority of their day at school therefore a school setting is ideal to conduct physical activity intervention studies The primary aim of this study was to measure the effect of an intervention programme on the physical activity participation levels among school going children and adolescents. The study was carried out at an urban independent Catholic school. The sample, which was conveniently selected, which included 100 learners from grade 5 to 7 with parental consent. A quantitative approach using a quasi-experimental design was used in this study. Baseline data included levels of physical activity participation, Body Mass Index (BMI), hip-waist ratio, and socio-demographic variables. Physical activity was assessed with the Modifiable Activity Questionnaire for Adolescents. The Promoting Lifestyle activity for Youth (PLAY) programme was implemented at the school. This process-oriented programme shifts the focus from fitness toward regular participation in daily physical activity, and it is not intended to replace a comprehensive physical education programme.</p>
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Pitkethly, Amanda Jane. "Examining the role of self-regulated learning in adolescent physical activity behaviour." HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/222.
Texte intégralRésumé :
Introduction Physical activity (PA) engagement is highly beneficial for adolescents and although interventions are shown to be effective, participants often return to former PA levels once the intervention is removed. Adolescents may lack explicit training in psychological and behaviour change skills required to sustain PA behaviour changes, such as self-regulation. SR is a key process in psychological functioning and its failure can result in impulse control problems, such as a tendency not to engage in behaviours that require a delay of gratification such as physical activity. Purpose Self-regulated learning (SRL) is an approach that focusses on how to make improvements through a systematic method of learning how to adapt to ever changing environments, i.e. through planning, self-monitoring, effort, self-efficacy, self-evaluation and reflection. Study 1 examined the effectiveness of studies examining SRL variables in a PA context. Study 2 translated and validated an English language SRL questionnaire to measure SRL in a Chinese adolescent population. Study 3 assessed the contribution of SRL variables to PA in both Chinese and Scottish adolescent samples. In preparation for study 5, study 4 qualitatively assessed Chinese students’ motivation for and engagement in PA. Finally, study 5 taught SRL skills in a PA context with the aim of positively impacting on adolescent PA levels. Methods and Results In study 1 a systematic review of the literature was conducted. The majority of reviewed studies demonstrated a positive effect of SRL variables on PA. The review highlighted a lack of research conducted using SRL theory. Study 2 translated and validated a Chinese version of an SRL questionnaire with 315 (and cross-validated with 480) Hong Kong Chinese adolescents. The short SRL-SRS-C was found to be a sufficiently reliable instrument to measure SRL in a Hong Kong Chinese adolescent population. In study 3, a cross-sectional study of 480 Hong Kong and 411 Scottish adolescents was conducted to assess the relationship SRL and physical activity. Results revealed that adolescents from Hong Kong and Scotland do not engage in sufficient PA to achieve the potential health benefits that PA can provide. Significantly more use of self-monitoring, self-evaluation and reflection was associated with significantly higher LTPA in Scottish adolescents. In both samples, SRL was weakly but significantly associated with higher PA, and self-efficacy and reflection played significant roles this SRL-PA relationship. Study 4 conducted two qualitative focus group interviews and found that most Chinese adolescents only engaged in PA during limited physical education classes. Most students were knowledgeable of the health benefits of PA, however, academic pressures and the effort required to overcome PA barriers was too great. Students propose that walking more and felt that novel ways to encourage PA, such as through WhatsApp, were worthwhile. Finally, study 4 used a quasi-experimental design with three groups (total n = 98) Hong Kong Chinese secondary school students. Peers modelled SRL skills and the learning was prompted either face-to-face or through Whatsapp. Meaningful, but not significant, mean value increases in PA and SRL were found. SRL was weakly but positive and significantly associated with PA, and reflection emerged as the key SRL component in the SRL-PA relationship. Conclusions SRL and PA are weak, but positive and significantly associated. Importantly, reflection has emerged as a significant predictor of adolescent PA. Adolescents with better SRL and reflective skills may be more aware of their strengths and weaknesses and able to translate this knowledge into future action. Considering that SRL skills are amenable to training, further experimental research should focus on teaching SRL strategies, particularly reflection, and assessing their impact on PA. SRL research in the adolescent PA area is promising but is at an early stage. Therefore, further research is recommended before strong conclusions can be made.
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Hung, Chor-nam, and 洪楚南. "The relationship between physical fitness and physical activity in Hong Kong secondary school students." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B19277106.
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Wong, Tung-kwong. "Aspects of habitual physical activity in Hong Kong primary school children /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20263466.
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Hovey, Richard. "Examination of the Bosco jump test." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55609.
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24
Leslie, Deborah R. "Comparison of training target heart rate determined by percent maximal heart rate reserve and ventilatory threshold in adults." Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/935928.
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Exercising at an appropriate training intensity for individuals is important for improvement of cardiorespiratory fitness. The American College of Sports Medicine (ACSM) has recommended that healthy adults exercise at an intensity of 60-80% maximal heart rate reserve (MHRR). The ventilatory threshold (VT) has also been recommended for use to determine intensity for exercise prescription. The purpose of this study was to compare the heart rate at the VT (VTHR) and at 60-80% MHRR. A secondary purpose was to determine the relationship, if any, between age, gender, height, weight, body mass index, percent body fat, resting heart rate, physical activity status (PAS), smoking history, and rating of perceived exertion (RPE) at 60 and 80% Hrmax and the difference between the VTHR and 60% MHRR. Subjects were 373 apparently healthy or high risk (as defined by ACSM, 2) individuals (209 men, 164 women), ages 19-77 (46.1+12.8 yr.), from the Ball State University Adult Physical Fitness Program who performed a maximal treadmill test between 1992-1994. VT was selected using a computerized V-slope method by the SensorMedics 2900TI Metabolic Measurement Cart. The VTHR (125.2+16.9) was significantly lower than the 60-80% MHRR (133.1+10.8 to 154.5+12.7) (p<0.05). Two hundred and sixty two subjects (70.1%) were below 60% MHRR and 3 subjects (0.8%) were above 80% MHRR at the VTHR. Multiple regression analysis explained 11.2% of the variance in the difference between the VTHR and 60% MHRR using RPE at 60% HR,,,, PAS, and smoking history. For the majority (70.2%) of the adults in this study, the VTHR falls below the traditional THR of 60-80% MHRR. The 60-80% MHRR would appear to be an appropriate exercise training intensity for cardiorespiratory benefit and therefore the %MHRR range alone would seem to be an adequate training intensity. Further study related to the VTHR is warranted to determine its application, if any, to exercise prescription intensity.<br>School of Physical Education
25
Wehrli, Kenneth Wayne. "Evaluation of a shallow water running test for the estimation of cardiorespiratory fitness." Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/935935.
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The direct measurement of maximal oxygen consumption (V02 max) has always been the benchmark for the determination of Cardiorespiratory fitness (CRF). However, the time and expense of that type of testing does not lend itself to students in activity classes or adult fitness participants. Therefore, the purpose of this study was to evaluate the validity of a 500 yard shallow water run test in determining CRF. A commonly used field test, the 1.5 mile run, was used as a basis for comparison during the 500 yard water run. Subjects in this study included 15 men and 28 women that completed a 1.5 mile run and a 500 yard shallow water run as well as a graded exercise test to fatigue on a treadmill. Correlations between 1.5 mile runs and the 500 yard shallow water run and VO2 peak were -.89 and -.80 respectively. In addition to simple regression analysis, multiple regression analysis was used to significantly improve the prediction of CRF (p<0.05). Peak HR during the 1.5 mile run significantly improved the 1.5 mile run prediction of CRF (R2=0.78 to 0.82) with a reduction in SEE (3.95 to 3.52 ml/kg/min) from the simple regression alone. Percent body fat and subject height improved the 500 yard shallow water runs prediction of CRF (R2=0.62 to 0.86) with a reduction in SEE (5.14 to 3.19 ml/kg/min). In conclusion the 500 yard shallow water run can be used to accurately predict CRF and with the addition of percent body fat and height provide a better prediction of CRF.<br>School of Physical Education
26
Wong, Tung-kwong, and 黃東光. "Aspects of habitual physical activity in Hong Kong primary school children." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31220125.
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Olsen, Janette. "Religiosity and Physical Fitness: A Study of Middle-Aged Mormon Men." Diss., CLICK HERE for online access, 1999. http://patriot.lib.byu.edu/u?/MTNZ,4318.
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莊硯琦 and Yin-kei Doris Chong. "Anaerobic recovery and physical activity in normal and obese children." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31257173.
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Hill, Christie D. "Effects of Meal Size and Type, and Level of Physical Activity on Perceived Masculinity, Femininity, Likability and Attractiveness." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc279273/.
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Previous research indicates that women are judged on the amount of food eaten and that both men and women are judged on the type of food eaten. This study is an attempt to determine whether meal size or type predominantly accounts for these findings on the variables of masculinity, femininity, attractiveness, thinness, fitness, and likability. Physical activity was also included to determine its effect on these variable. Subjects used were 313 undergraduate students. Results indicate that meal type is more influential than meal size and that physical activity significantly influences judgements of others. The results are discussed in terms of future research and relatedness to socio-cultural theories of eating disorders.
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Chan, Kwok-cheung Anson, and 陳國璋. "How the built environment affects physical activity and health." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44901781.
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Litke, Lonnie D. (Lonnie Dale). "Relationship Between Mood State and Cognitive Strategies on Endurance Performance." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc500275/.
Texte intégralRésumé :
The present investigation examined the relationship between elated and depressed moods and dissociation, association, and positive self-talk strategies on endurance performance. Results showed a significant mood main effect with elated subjects performing longer than depressed subjects. Results also revealed a significant cognitive strategy main effect with positive self-talk and dissociation groups producing longer endurance times than association and control groups. A significant interaction between mood and cognitive strategy found that subjects in the positive self-talk and dissociation groups increased their performance time to a greater extent from the depressed to the elated condition than did subjects in the association and control groups. Results are discussed in terms of previous investigations of mood and cognitive strategies on physical performance.
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Nizeyimana, Eugene. "Perceived constraints to physical activity among paramedical institution students in Uganda." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
Texte intégralRésumé :
Research has clearly shown that all individuals will benefit from regular physical activity. Unfortunately, young adults including college and university students are not physically active on a regular basis worldwide. In the developing world particularly in Sub- Saharan Africa, physical inactivity along with tobacco use, poor diet and nutrition are increasingly parts of today&rsquo<br>s lifestyle. Physical activity declines with age and the most important decline appear to be during the transition period from high school to university and during university years. The aim of this study was to assess the level of physical activity, to investigate the perceived constraints to physical activity and to determine whether socio-demographic characteristic have an influence on participation in physical activity and perceived constraints to physical activity among paramedical institutions students in Uganda. A cross-sectional study with descriptive quantitative design was conducted. Four hundred (400) paramedical institution students were selected using a stratified random sampling technique. A self-administered questionnaire adopted from the literature was used to collect the data. A response rate of 90% was obtained. Descriptive and inferential statistics using the statistical package for social sciences were used to analyze the data. The relationships and associations between different variables were determined by carrying out significant tests using chi-square tests. Alpha level was set at 0.05. The mean age of the sample was 22.44 years (SD = 2.03). Males constituted 73.9% and females constituted 26.1% of the sample. Students from eight (8) health professional courses participated in the study. Over half (59%) of participants were classified as physically active and 41% were classified as inactive or sedentary. For male participants, lack of the right equipment to exercise and wanting to do other things in their free time were perceived as the major constraints to physical activity. For female participants, lack of motivation and tiredness after exercise were perceived as the major constraints to physical activity. The findings of this study demonstrate that there is an influence of socio-demographic characteristics such as gender, year of the study and different departments/schools on participation in physical activity and perceived constraints to physical activity. They also indicate the need of health promotion intervention aiming at promoting physical activity among paramedical institution students in Uganda.
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Lee, Heesu. "Effects of Levels of Physical Activity on Physical Self-Concept and Social Physique Anxiety Among College Students." CSUSB ScholarWorks, 2012. https://scholarworks.lib.csusb.edu/etd-project/2760.
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Physical activity plays a crucial role in contributing to psychological stability regarding physical concept. However, the evidence for showing the association between levels of physical activity and the psychological state has not been closed to focus on college students. This study was to examine the importance of physical activity by investigating the effects of different levels of physical activity on physical self-concept and social physique anxiety among college students. This study used a secondary data set approved by Institutional Review Board, and obtained a written permission and approval for data use. The data set used for this study was not previously analyzed and published. A total of 238 participants (99 males and 139 females) were 4-year comprehensive university students in Southern California. Godin Leisure-Time Exercise Scale (GLTES), Physical Self-Description Questionnaire (PSDQ), and Social Physique Anxiety Scale- 7(SPA-7) were used to analyze levels of physical activity, physical self-concept, and social physique anxiety, respectively. The SPSS version 19 was used to analyze the data for the purpose of this study. Results showed that there were statistically significant differences in physical self-concept and social physique anxiety among the levels of physical activity. There were statistically negative correlations between social physique anxiety and physical self-concept.
34
Isaacs, Roshan. "Comparison of physical activity practices and dietary habits of health club members and community controls in Khayelitsha, Cape Town." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4386_1256889698.
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<p>Chronic diseases pose public health concerns globally with an increasing trend in developing countries. The development of interventions to minimize or prevent the burden associated with chronic diseases has therefore become a necessity. In 2002 the School of Public Health of the University of the Western Cape developed a health club intervention in Khayelitsha. This intervention focused on promoting healthy lifestyles, particularly improved diet and physical activity. The objectives of this study was to determine whether members were more physically active than non-members and to determine whether members made healthier dietary choices than non-members.</p>
35
Lopato, Marisza. "The effect of body mass and body composition on mean power output in the 30 second Wingate test at five resistance settings /." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59408.
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The purpose was to examine the effect of body mass and body composition on the mean power output in the 30 second Wingate cycling test at five resistance settings. Forty females (X = 22 years), were divided into four groups based on body mass and the sum of five skinfolds. The Wingate test was performed at the resistance settings of 0.075, 0.080, 0.085, 0.090, and 0.095 kp/kg body weight. A 3-way ANOVA (mass, skinfolds, resistance settings) indicated that: (1) mean power (W/kg) was similar for low and high mass groups; (2) the low sum of skinfolds group had a significantly higher (p $<$ 0.02) mean power output than the high sum of skinfolds group; and (3) at resistance settings of 0.080, 0.085, 0.090, and 0.095 (kp/kg) the low sum of skinfolds group had a higher (p $<$ 0.05) mean power score than the high sum of skinfolds group at equivalent resistance settings.
36
Lu, Shin-Shan. "The effects of active and passive recovery on blood lactate concentration and exercise performance in cycling tests /." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60011.
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The purpose of this study was to examine the effects of recovery modes and exercise durations on blood lactate concentrations and subsequent performance in cycling tests. Fourteen male subjects completed six randomly assigned experimental protocols with a combination of three durations and two modes of recovery (passive and active cycling at 45% VO$ sb{ rm 2 max}$). Each protocol consisted of eight bouts of cycling at 120% of VO$ sb{ rm 2 max}$ interspersed with five minute recovery periods. Each protocol terminated with a maximal performance task consisting of a 45s all-out cycling test. Results indicated significantly (p $<$ 0.05) higher blood lactate concentrations in the passive and 60s conditions. Mean power outputs measured in the performance task were significantly (p $<$ 0.05) higher in the active recovery conditions compared to passive recovery. Mean power outputs were lower during the 60s conditions. Since the correlation between blood lactate and mean power output was low (r = -0.24), other factors were influencing subsequent performance.
37
Mancini, Wendy F. "Power output and lactate concentration following repeated 10 s intervals using varying recovery patterns." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61140.
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Blood lactate concentration and mean power output were examined over a series of maximal intermittent exercise bouts with varying recovery patterns. Thirteen elite male cyclists completed four randomly assigned experimental conditions. Each exercise/recovery condition consisted of twelve 10 s maximal exercise bouts on a Monark cycle ergometer. Four different recovery patterns (30, 60, 90 and 120 s) followed the repeated 10 s all-out efforts. Results revealed that the mean power output averaged over the 12 trials was 12.7, 13.0, 13.2 and 13.4 W/kg, for the 30, 60, 90 and 120 s conditions, respectively. Blood lactate concentration during exercise were 9.9, 9.2, 6.5 and 6.0 mmol/1, for the 30, 60, 90 and 120 s conditions, respectively. The 30 and 60 s conditions yielded significantly lower mean power output values compared to the 90 and 120 s conditions. Following the repeated maximal 10 s efforts, blood lactate concentration was significantly greater in the 30 and 60 s recovery conditions compared to the 90 and 120 s conditions.
38
Koziris, L. Perry (Lymperis Perry). "Blood lactates following intermittent and continuous cycling tests of anaerobic capacity." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60051.
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The purpose of this study was to compare the concentration of and the time to peak blood lactate following three 90-s cycle ergometer tests--intermittent all-out (Int-A), continuous all-out (Cont-A), and continuous constant (Cont-C), and to compare group peak lactate to blood lactate at individual peak time. Eight fingertip blood samples were drawn between 1 and 12min post-exercise. Subjects were university hockey players (n = 19) and physical education students (n = 19). The two all-out tests had a higher peak concentration than the Cont-C test (P $<$ 0.05). The Int-A test had an earlier peak than the two continuous tests (P $<$ 0.05) but this difference vanished if peak time was measured from the onset of the tests. A number of sampling times had lactate concentrations similar to the individual peak concentration (P $<$ 0.05): (1) 1, 2, 3, and 4min for Int-A; (2) 2, 3, 4, 5, and 6min for Cont-A; (3) 2 and 4min for Cont-C.
39
Ladouceur, Ginette. "A comparison of peak VO2, EPOC and lactate concentration on three tests of anaerobic endurance /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64026.
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Kaleth, Anthony Scott. "Effects of volume of resistance training on muscular strength and endurance." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1074543.
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The American College of Sports Medicine recommends a resistance exercise routine that consists of a minimum of 1 set of 8-12 repetitions on 8-10 exercises, 2 times per week. These guidelines are less than traditional programs and are based on the premises that longer programs are associated with lower adherence and that additional sets and repetitions produce little, if any, additional increases in strength. Therefore, the purpose of this study was to determine if greater gains in strength and endurance could be attained by doubling the recommended dose. Sixteen subjects were randomly assigned to one of two training groups that performed 1 or 2 sets of 8-12 repetitions for 10 weeks on 7 exercises (chest press, lat pull-down, leg ext., leg curl, shoulder press, triceps ext., biceps curl) and 8 subjects were assigned to a non-training group. Pre- and post-training 1repetition maximum (RM) and muscular endurance were measured. To assess endurance, subjects completed as many repetitions as possible at 75% of their pre-training 1-RM on all exercises except the shoulder press (60% of 1-RM). Both training groups showed a significant increase in 1-RM strength and endurance compared to controls (P < 0.05). Only the biceps curl exercise showed a significant difference in strength between the two training groups (P < 0.05). The 2 sets group increased post-training endurance to a greater degree than the 1 set group, but only the lat pull-down exercise was significant (P < 0.05).. Contrary to previous studies, these findings pertain to 8-10 exercises that use larger muscle groups. It was concluded that 1 set of 8-12 repetitions was as effective as 2 sets in increasing muscular strength and endurance.<br>School of Physical Education
41
Jones, Marc Rhys. "Investigating factors which may influence recovery and preparation in professional rugby union." Thesis, Swansea University, 2014. https://cronfa.swan.ac.uk/Record/cronfa42486.
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To enhance understanding of recovery and preparation in rugby union, the aim of this thesis was to examine the impact of competition on key parameters and investigate factors which may influence the recovery process from competition and training. The findings of study one demonstrate that movement patterns and thus the physiological demands of match-play vary considerably between different positional groups. Additionally, study two demonstrates that the movement characteristics which determine the extent of muscle damage post-match are position specific, and that movement characteristics may be used to prospectively tailor individual recovery and manage subsequent training. Recovery patterns may also be influenced by factors not associated with match-play such as sleep, which has important physiological and psychological restorative effects. The findings of study three suggest that sleep patterns may vary considerably within a squad with many players presenting evidence of sleep disruption, particularly post-match which may be detrimental to recovery. Recovery following exercise may also be modulated by the application of post-exercise recovery strategies such as cold water immersion. However, study four demonstrates that cold water immersion may impede adaptation to strength training in rugby union players. When no recovery intervention was administered during a five week pre-season period, isometric mid-thigh pull peak force and relative peak force significantly increased by 5.4 +/- 4.7 and 5.8 +/- 5.4% respectively. However when individuals were immersed in cold water post-training there were no significant changes in strength during the training period. These findings may have great implications for strength training, particularly during periods of physical development. The findings of the thesis have furthered understanding of the characteristics of performance and identified several factors which influence recovery from training and competition. This in turn may be used to inform best practice procedures in attempt to 'optimise' preparation and recovery in rugby union.
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Petaishiski, Jayme Nichole. "The buffering effects of perceived fitness on stress reactivity." CSUSB ScholarWorks, 2002. https://scholarworks.lib.csusb.edu/etd-project/2212.
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This study addresses the effects of the changing workforce and the physiological and psychological benefits of fitness. The purpose of this experiment is to test the relationship between situational stressors, perceived fitness, exercise locus of control, self-control, and perceived stress.
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Gluck, Beth. "The Effects of Physical Activity on Bone Density in Adolescent Females." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/GluckB2004.pdf.
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Burton, Catherine J. "The heart rates of elementary children during physical education classes." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1020151.
Texte intégralRésumé :
The purpose of this paper was to monitor the heart rates of-first, third, and fifth grade students during physical education classes to determine if the classes contribute to improvement in cardiovascular fitness levels. The study determined the average heart rate of students in physical education classes and determined the percent of time the heart rate remained in, above, and below a predetermined heart rate range of 140 to 180 beats per minute.Students from seven schools were involved in this study which included: 338 first graders, 236 third graders, and 217 fifth graders. Each school was visited three times.The measurement of heart rates was accomplished by placing a heart rate monitor on each student during their regular physical education class. The results indicated that the average heart rate for all first graders was 142.28 beats per minute (bpm), for all third graders was 141.68 bpm, and for all fifth graders was 142.85 bpm. The percentage of time spent in the pre-determined heart rate range for first grade students was 39.98%, third grade was 37.78%, and 40.64% for fifth grade. The percentage of time spent above the pre-determined heart rate range for first grade was 15.59%, 15.76% for third grade, and 13.91% for fifth grade. The percentage of time spent below the predetermined heart rate range for first grade was 43.99%, for third grade 46.32%, and 47.00% for fifth grade. The above findings revealed that the average heart rates did increase, although when further examining the percentage IN, ABOVE, and BELOW the pre-determined heart rate range the figures indicated that heart rates were not maintained at an appropriate level of intensity for the adequate time needed to increase cardiovascular fitness levels. If cardiovascular fitness is a goal in these classes, changes in class drills and games will be required to accomplish this goal.<br>School of Physical Education
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Sheinbein, Shelly T. "Psychosocial Mediators of the Fitness-depression Relationship Within Adolescents." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699904/.
Texte intégralRésumé :
Adolescence is a developmental period during which boys and girls are at high risk of developing major or minor depression. Increases in fitness have been associated with lower levels of depressive symptomatology and improvements in psychological well-being, yet the mechanisms that underlie this relationship have not been thoroughly examined. Three such psychosocial variables (i.e. body satisfaction, social physique anxiety, and physical activity self-efficacy) have been identified as possible mechanisms and although they have theoretical support, additional research is needed to demonstrate empirically the potential effects of these variables. Self-report measures were used to assess the psychosocial variables and the Progressive Aerobic Cardiovascular Endurance Run (PACER) in conjunction with age, Body Mass Index [BMI], and sex was used to determine an estimate of aerobic capacity (VO2max). Path analyses were used to test the proposed model using version 6.2 EQS Multivariate Software. Results of study revealed that the boys’ and girls’ depressive scores were determined based on the extent that their fitness levels improved their satisfaction with their bodies and lowered the anxiety they experience in relation to real or imagined judgments of their physique. Although all pathways in the model were significant, with the exception of physical activity self-efficacy to depression, differences emerged between the boys and girls in terms of the strength of some of the relations amongst the variables. Limitations include restricted generalizability, self-report measures, and cross-sectional design. Results have implications for individuals in a context intended to improve physical and psychosocial well-being of adolescents.
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Wiley, Ruth Anne. "Motivational factors enhancing student involvement in physical education." CSUSB ScholarWorks, 2008. https://scholarworks.lib.csusb.edu/etd-project/2970.
Texte intégralRésumé :
The purpose of this study was to examine motivational factors that would increase middle and high school students participation in physical education. This study is intended to better understand what factors students lack in order for participation in physical education activities and to stress the importance of physical education acitivity for a healthy lifestyle.
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Andresen, Jean M. "Aortic Baroreceptor Reflex Control of Blood Pressure: Effect of Fitness." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc500922/.
Texte intégralRésumé :
Aortic baroreflex (ABR) control of blood pressure was examined in 7 untrained (UT) and 8 endurance exercise trained (EET) young men. ABR control of blood pressure was determined during a steady state phenylephrine infusion to increase mean arterial pressure 10-15 mmHg, combined with positive neck pressure to counteract the increased carotid sinus transmural pressure, and low levels of lower body negative pressure to counteract the increased central venous pressure. Functioning alone, the ABR was functionally adequate to control blood pressure. However, ABR control of HR was significantly diminished in the EET subjects due solely to the decrease in the ABR sensitivity. The persistent strain from an increased stroke volume resulting from endurance exercise training could be the responsible mechanism.
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Wildschutt, Phillip Jacobus. "The effect of accumulative physical activity on the fitness and health status of rural school children." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&.
Texte intégralRésumé :
Numerous studies focusing on cardiovascular disease risk factors such as obesity, hypertension, smoking, diabetes mellitus, elevated serum lipids, inactivity and lack of physical fitness prevalent in children highlight the importance of the early diagnosis and prevention of conditions that are associated in adulthood with cardiovascular disease. The purpose of this study was to assess the impact of accumulative physical activity on the fitness profile, blood pressure and body composition in 14-16 year old school children in the Western Cape of South Africa.
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Chu, Yuet-wah, and 朱月華. "The pattern of physical activity in children." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38572813.
Texte intégral
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De, Pao Andrew T. (Andrew Thadeu). "Factors influencing short duration, high-intensity endurance cycling." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52267.
Texte intégralRésumé :
Thesis (MSc)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: A 5 km cycling time trial (TT) demands high, sustained muscle power output and
substantial oxidative and glycolytic energy delivery. The aims of this study were to firstly
use the novel approach of using Peak Sustained Power Output (PSPO) as a predictor of
cycling performance for variable fixed-workload testing and 5 km time trialing and
whether oral creatine supplementation would affect 5 km time trial performance and
metabolism. The effect of oral creatine supplementation with 20 g/day for 7 days on 5 km
time trial performance and metabolism after a random-variable workload protocol
(stochastic test) was investigated in a single-blind placebo controlled study. Thirteen
trained male cyclists volunteered for the study that was approved by the University of
Stellenbosch Research Ethics Committee. We hypothesized that Cr supplementation
would affect time trial performance as well as the appearance of breakdown products of
adenine nucleotides in the plasma. Baseline: the subjects' peak power output was
measured and they underwent a baseline stochastic test followed immediately by a 5 km
time trial (STI) and on a different day, a single 5 km time trial test (Tl) was undertaken.
Study 1: In the following week the subjects repeated the stochastic test with 5 km time
trial (ST2) and on a different day a 5 km time trial (T2). During T2 blood samples were
taken at regular intervals as well as during recovery. A muscle biopsy was taken after T2
in the recovered state. The major performance predictors were the 5-km time trials (TTl
and TT2) with a coefficient of variation between the thirteen trained male cyclists of
0.6%. The 5 km time trials in the fatigued state (STI and ST2) had a coefficient of
variation of 0.7%. Results: There was a significant difference between 5 km TT
performed fresh and 5km TT performed fatigued (P=0.0001). The decrement in time
ranged between 1.0 sec to 38.0 sec. The relationship between two different high intensity
endurance performance tests: PSPO and 5 km TT (TT mean) had a correlation ofr=-0.79
P<O.OI. The correlation between PSPO and the 5 km TT performed in the fatigued
condition (ST mean) was r= -0.60 P<0.05. There was also a relationship between age and
PSPO (F 0.73; P<0.05). Age showed a good negative relationship with TT mean (F-
0.71; P<0.05). Mass and PSPO were also correlated (FO.85; P<O.OI). Plasma lactate
concentrations were significantly different from rest at all other time points P<O.OOOIup
to 20 minutes post-exercise. Hypoxanthine (P<O.OOOI)and urate (P=O.05) concentrations were also significantly different from rest at all other time points. There was a significant
change in plasma hypoxanthine concentrations over time (P<0.0001). There was a
significant correlation between plasma lactate concentration at time 0 in recovery and %
Myosin Heavy Chain (MHC) I (FO.59, P<0.05) and % MHC na (F -0.61, P<0.05). Area
under the curve for hypoxanthine showed significant relationships of F -0.53 (P=O.05)
and F 0.56 (P<0.05) respectively for %MHC I and %MHC ITa. Study 2 -
Supplementation: following T2 the subjects received Cr or placebo powder containing
sachets to be ingested 4 times daily for the next week with carbohydrate also provided.
Post-supplementation testing: the subjects returned and conducted another variable fixedworkload
test with 5 km time trial (ST3) as well as a single 5 km time trial (T3). They
once again underwent the same blood sampling routine and had another muscle biopsy in
the rested state. The average of ST1 and ST2 was used as the major measure for
performance under fatigued conditions and TTmean. Results: there was a significant
difference between 5 km TT performed fresh and 5 km TT performed fatigued
(P=0.0001). Plasma lactate, hypoxanthine and urate samples were taken at the postloading
5 km time trial (TT3). The levels of these plasma metabolites were compared to
the concentrations of those sampled at TT2 and between the creatine and placebo groups.
The plasma hypoxanthine levels were significantly different from rest for both the
creatine and placebo groups (P<0.0001). Plasma urate had significant change in
concentrations over the time points (P<0.005). Another significant difference was found
between the creatine and placebo groups for the pre-and post tests conducted (P<0.005).
The creatine group showed a non-significant increase (7%) in mean total intramuscular
creatine concentration. No significant differences were found in the mean values for total
nucleotide concentration pre- and post loading in the creatine and placebo groups.
Conclusions: The 5 km performance test resulted in high values for plasma lactate,
hypoxanthine and urate, an indication of fatigue induced by this performance test. Oral
creatine supplementation did not improve performance significantly in the variable fixedworkload
protocol 5 km time trials or the individual 5-km time trials and had an effect on
adenine nucleotide metabolism in both the variable fixed-workload protocol 5-km time
trial and individual 5 km time trial performance tests.<br>AFRIKAANSE OPSOMMING: Die 5 km fietsry tyd toets (TT) verg hoëvolgehoue, spierkrag en wesenlike oksidatiewe
en glikolitiese energie verskaffing. Die doelwitte van hierdie tesis was eerstens om 'n
nuwe fietsergometer toets te ontwerp vir die voorspelling van kompetisie prestasie. Die
toets was 'n veranderlike, voorafvasgestelde werkladingstoets (VVWT). Dit is vergelyk
met 'n maksimale volgehoue kraguitsetingstoets (MVKT) en 'n 5 km TT. Daarna is
bepaal ofkreatien supplementasie 'n effek sou hê op enige van hierdie oefeningstoetse of
metabolisme tydens die 5 km TT. Die supplementasie eksperiment was 'n enkelblinde,
plasebo-gekontroleerde studie ontwerp. Dertien manlike fietsryers het vrywilliglik
deelgeneem. Resultate: Daar was 'n statisties betekenisvolle verskil tussen die 5 km TT
wat vars onderneem is en die wat direk na die VVWT onderneem is (P=O.OOOl). Daar
was ook 'n betekenisvolle korrelasie tussen die twee verskillende hoë intensiteit korttydsvak
oefeningstoetse (r=-0.79 P<O.Ol vir TT en MVKT). Plasma laktaat konsentrasies
was betekenisvol verhoog met vergelyking van die monsters geneem tydens rus en all
ander onteledings tydspunte (P<0.0001) tot en met 20 minute na oefening. Hypoxantien
(P<O.OOOl) en uraat (P=0.05) konsentrasies was ook betekenisvol verskillend van rus by
alle ander tysdpunte. Daar was 'n betekenisvolle korrelasie tussen plasma laktaat direk na
oefening en die % Myosien Swaarketting (MIlC) I (r=0.59, P<0.05) en % MHC ITa (r= -
0.61, P<0.05). Studie 2 - Na supplementasie was daar geen verskil in oefeningsprestasie
nie maar wel in plasma metaboliet waardes van nie. Gevolgtrekkings: Die 5 km TT het
baie hoë waardes vir plasma laktaat tot gevolg gehad, asook hypoxantien en uraat, 'n
indikasie van die hoë mate van vermoeienis deur hierdie oefeningtoets berwerkstellig.
Kreatine supplementasie kon nie oefeningsprestasie verbeter nie.