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Naik, Sagar K. "Force modulation deficits in chronic stroke grip formation and grip release phases /." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041222.
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Hainbuch, Friedrich. "Grip strength training prevents falling /." Aachen : Shaker, 2008. http://d-nb.info/988058014/04.
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Turrell, Yvonne. "Grip force adjustments in collisions." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368433.
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Strömberg, Emmalisa. "Analysprogram för grip- och lyftkraft." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149098.
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Att reglera sin gripkraft och lyfta ett föremål kan tänkas vara enkelt och självklart. Men för personer med visa neroulogiska sjukdomar som hydrocefalus och Parkinsons sjukdom har det visat sig att deras sjukdomar kan påverka deras gripkraft. Om nu gripkraften påverkas kan det kanske användas inom vården för att kontrollera sjukdomsförloppet, om det blir bättre efter behandlingar. På Medicinsk Teknik - Forsking och Utveckling (MT-FoU) har ett mätinstrument som mäter gripstyrkan och lyftaccelerationen konstruerats. För att detta instrument skall bli mer användbart i klinisk praktik behövs ett analysprogram för att ta fram resultatet efter mätningar gjorda med utrustningen. Ett datoriserat analysprogram har potential att vara betydligt snabbare, effektivare och objektivare jämfört med den manuella analys som används idag. Syftet med detta projekt är att skapa ett analysprogram som kan ersätta arbetet av den manuella analysen och som kan ta fram resultat från mätdata. Resultatet skall inte skilja mellan en manuell analys och den automatiska analysen. Målet är att analysen ska bli snabb, effektiv och vara objektiv samt ge samma resultat som en manuell analys skulle ge. Programmet som konstruerades blev snabbare och effektivare än den manuella analysen. Mätningar på sex stycken friska, frivilliga personer användes för att jämföra de automatiska och manuella analyserna. Ingen signifikant skillnad kunde påvisas för någon av de parametrar som skulle analyseras, och detta visar att det automatiska analysprogrammmet fungerar lika bra som manuella analyser och därmed kan ersätta dessa för att analysera framtida mätningar. Dock är detta endast testat på friska personer så om de automatiska och manuella analyserna är jämförbara även för personer som har en neurologisk sjukdom bör utredas vidare innan den automatiska analysmetoden tas i bruk.To be able to regulate your grip force and lift an object can be simple for healthy people. However, for people with disabilities of neurological diseases such as hydrocephalus and Parkinson’s disease it has been found that their diseases can affect their grip force. If the grip power is affected, it may be used in healthcare to check the course of disease, if it gets better after treatment. At the department of Biomedical Engineering - Research and developmet a measurement device for analysing grip force and acceleration when lifting an object has been developed. In order for this instrument to be more useful in clinical practice, an analysis program is required to produce the result after measurements made with the equipment. A computerized analysis program has the potential to be significantly faster, more efficient and more objective compared to the manual analysis used today. The purpose of this project was to create an analysis program that can replace the work of the manual analysis and which can generate results from measured data. The results should not be different between a manual analysis and the automatic analysis. The goal was that the analysis should be fast, efficient and objective and also provide the same results as a manual analysis would provide. The program that was designed became faster and more efficient than the manual analysis. Measurements on six healthy volunteers were used to compare the automatic and manual analyzes. No significant differences could be detected for any of the parameters that were analyzed, and this shows that the results of the automated analysis are comparable to the manual analysis and thus can replace these to analyze future measurements. However, the automatic analysis has only been tested on healthy people, so if the automatic and manual analyzes are comparable even for people with a neurological disease should be further investigated before using the automatic analysis method on patient data.
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Eliasson, Lars. "Analyses of single-grip harvester productivity /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1998. http://epsilon.slu.se/avh/1998/91-576-5614-2.gif.
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Yamanaka, Juri. "Anticipatory grip force control in stroke." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97235.
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When moving the arm while holding an object, grip force (GF) increases at movement onset (anticipatory control; AC). Post-stroke individuals preserve AC in some tasks but few of these have been ecological. We hypothesized that post-stroke individuals will have problems in AC during functional hand tasks. Subjects lifted a 63.5g load cell (lift) with the thumb and index finger and held it (hold) while flexing or extending the elbow (transport). GF, EMG activity of the elbow and thumb, and forearm acceleration were recorded. Stroke subjects had no impairments in AC between GF and acceleration. However, they used higher GF, had deficits in maintaining constant GF during hold, demonstrated abnormal couplings between GF and temporal parameters of grasp and had disrupted timing of muscle activation between thumb and elbow flexors during flexion movements. These findings suggest that people with stroke have disruptions in the patterns of grasping during functional arm tasks.Quand le bras en mouvement tient un objet, la force de préhension (FdP) augmente en début de mouvement (contrôle anticipatoire; CA). Après un accident vasculaire cérébral (AVC), les personnes conservent le CA dans quelques tâches mais peu d'entre elles sont écologiques. Nous avons émis l'hypothèse que l'AVC entraîne des problèmes de CA lors de tâches fonctionnelles. Les sujets ont levé un capteur de force de 63,5g (lever) avec le pouce et l'index et l'ont tenu (maintien) tout en fléchissant ou allongeant le coude (transport). La FdP, l'activité EMG des muscles du coude et du pouce ainsi que l'accélération de l'avant-bras ont été enregistrées. Les sujets avec un AVC n'avaient pas de déficience dans le CA entre la FdP et l'accélération. Toutefois, ils utilisaient plus de FdP; ils avaient des déficits dans le maintien de la FdP; ils ont démontrés des relations anormales entre la PdF et les paramètres temporels de préhension et ils présentaient une perturbation temporelle de l'activation musculaires entre le fléchisseurs du coude et du pouce lors des mouvements de flexion. Ces résultats suggèrent que les l'AVC altère les patrons de préhension lors de tâches fonctionnelles du bras.
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Lee, Peter T. (Peter Taeyun). "Haptic grip interface for virtual tools." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10817.
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Dyberg, Malin, and Ahlbäck Elvira Troillet. "P.E.G.A.S : Powered Exoskeleton Grip Amplifying System." Thesis, KTH, Mekatronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295802.
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In this bachelor’s thesis, the development and construction of a soft exoskeleton for a human hand is described.The purpose of the project includes evaluating what type of exoskeleton that is most suitable for aiding the user inactivities of daily living and how this exoskeleton can be constructed in order to increase grip strength in the human hand. In addition, the prototype should be portable and not inflict any harm on the user. The necessary theoretical research is thoroughly conducted followed by the construction of the final prototype. The purpose of the project is achieved, resulting in a flexible, portable and safe exoskeleton which with satisfaction can aid the user in its activities of daily living. However, this prototype is limited to exclusively include the thumb and index finger, and in further work the prototype can be developed to include all five fingers of the human hand.I detta kandidatexamensarbete behandlas utvecklingen och konstruktionen av ett mjukt exoskelett för den mänskliga handen. Syftet med projektet är att undersöka vilken typ av exoskelett som passar bäst för att hjälpa användaren med aktiviteter i det dagliga livet, samt hur detta exoskelett kan konstrueras för att förstärka greppet i handen. Prototypen ska även vara bärbar och inte skada användaren. Den nödvändiga teorin presenteras, följt av konstruktionen av den slutgiltiga prototypen. Syftet med projektet uppfylls och resulterar i ett flexibelt, portabelt och säkert exoskelett som kan hjälpa användaren med aktiviteter i det dagligalivet. Dock är denna prototyp begränsad till att endast inkludera styrning av tummen och pekfingret, och prototypenkan således i framtida arbeten utvecklas till att inkludera samtliga fem fingrar på den mänskliga handen.
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Chen, Xuewei Sue. "The effect of elbow position and grip span on isometric grip strength and force distribution of fingers." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ31408.pdf.
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Carter, Evan C. "Religious Cognition and Duration of Maintained Grip." Scholarly Repository, 2010. http://scholarlyrepository.miami.edu/oa_theses/23.
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Recent work suggests that the links between religious belief and behavior with a variety of positive outcomes (e.g., longer life, more marital satisfaction, scholastic achievement, better health behaviors) may be partially explained by religious belief systems' ability to foster self-control and self-regulation. The current investigation sought to explore this hypothesis by determining if induction of religious cognition (through a supraliminal religious prime) could increase behavioral self-control, operationalized as performance on a maintained grip task. Using 118 participants, the author tested whether nonconscious exposure to religious content would increase the amount of time that participants were willing to physically persist at two rounds of the maintained grip task as compared to a control group. A within-subjects trial-by-prime interaction was found (the prime appeared to cause participants to persist at the task for less time during the first trial, but not the second) and a between-subjects sex-by-prime interaction was found (on average, men given the religious prime held their grip for less time than did men in the control group, whereas no differences were found between women). Findings are discussed in terms of the link between religion and self-control and future directions are suggested.
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Romin, Alexander, and Anton Karlsson. "Grip stiffness analysis of carton board packages." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-64772.
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This report is a part of the research project "A New Model for Deformation of Carton Board Packages by Manual Handling". This project is a collaboration between Örebro University and two companies engaged in carton board packages. This report describes whether Syntouch's BioTac is an appropriate tool, compared with a consumer study when investigating the grip stiffness of consumer packaging. Syntouch's BioTac is an artificial sensor designed to imitate the force of a human fingertip. The concept of grip stiffness is used in the packaging industry to describe the packaging’s properties to withstand clamping pressure when handling by the user. That is, the robustness of the packaging. The carton board packaging should perceive as stiff, firm to grip and not deform during handling. The purpose is to perform laboratory tests with the BioTac sensor, to see if the sensor can be used as a measurement method for grip stiffness of card board materials.Denna rapport som ingår i forskningsprojektet ”A New Model for Deformation of Carton Board Packages by Manual Handling”. Detta projekt är ett samarbete mellan Örebro Universitet och två företag som arbetar med förpackningar. I denna rapport beskrivs och analyseras om Syntouch’s BioTac är ett lämpligt verktyg, i jämförelse med en konsumentstudie vid undersökning av en förpacknings greppstyvhet. Syntouch’s BioTac är en konstgjord sensor som är utformad för att imitera kraften som en mänsklig fingertopp har. Greppstyvhet är ett begrepp som används i förpackningsindustrin och beskriver förpackningens egenskaper att kunna motstå klämtryck vid hantering. Det vill säga förpackningens robusthet. Förpackningen skall uppfattas som styv, greppvänlig och skall ej deformeras vid hantering. Syftet med det här arbetet är att utföra laborativa tester med sensorn BioTac, för att se om sensorn kan användas som en objektiv mätmetod för greppstyvhet för olika förpackningsmaterial.
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Clerke, Anita. "FACTORS INFLUENCING GRIP STRENGTH TESTING IN TEENAGERS." University of Sydney, 2006. http://hdl.handle.net/2123/3553.
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Doctor of PhilosophyThe aims of the Thesis were: to investigate and quantify the factors influencing the production of maximum isometric grip strength force in a sample of Australian teenagers when using JamarTM-like handgrip dynamometers; to determine the reliability of this measure over long and short retest intervals; to establish a database of anthropometric and strength values for this group and prediction equations for premorbid strengths to aid assessment of recovery in those with upper limb pathologies. The history of these handgrip dynamometers demonstrates that they have been employed in one form or another for over three hundred years and are still widely used today in hand rehabilitation and medical examinations. Many new types of dynamometers have been constructed subsequent to the ubiquitous JamarTM and have all been briefly reviewed here. Handedness (dominance) was thought to be a possible factor influencing grip strength performance and was later evaluated. But first, the Edinburgh Handedness Inventory was tested with 658 teenagers and 64 adults and confirmed to be a valid tool for assessing handedness. Its validity was improved by substituting the tasks of sweeping and opening the lid of a box for hammering and use of a screwdriver. Its excellent reliability (ICC = .78, p < 0.01) was confirmed with 45 teenagers and 45 adults. There were 235 teenagers who performed maximal isometric grip strength tests and from the results a local database was created. It was confirmed that the grip strength difference in males and females becomes significant after the age of 13 years, and that the average teenaged male is stronger than the average teenaged female by 11.2 Kg force (p < .01). Height, weight, BMI, hand dimensions, past upper limb injuries, degrees of handedness and exercise levels were measured and compared with known norms to establish that the grip strength tested sample of teenagers was representative of urban teenagers in Australia. The influence of handedness on maximal grip strength in dominant and non-dominant hands was unable to be completely ascertained due to the vast majority of the sample of teenagers being right-handed. Only 13 of the 235 teenagers used their left hand for most tasks, with another 20 using their left hands for a small majority of tasks. There was a grip strength bias towards the dominant hand of 2.63 kg force (p < .01). The most accurate way to predict the grip strength of one hand is by knowing the grip strength of the other hand. Prediction models found that 90% (R2 adj .902) and 70% (R2adj .702) of the variance in one hand could be accounted for by the grip strength of their other hand for male and female teenagers, respectively. Prediction equations were also created to assist in estimating the pre-morbid grip strength of teenagers suffering from bilateral hand injuries. If for the males, measurements for height and hand surface area were entered into these models, the grip strength of the dominant and non-dominant hands could be estimated with 62.6 and 63.5% of the variance between the real and predicted scores accounted for, respectively. For the females the prediction models using height and hand surface area could only account for 33.9 and 42.8% of the variances, with no other independent variables improving the prediction equations. The reliability of the maximal grip strength performance of 154 of these teenagers was retested after one or four weeks. A number of sub-group permutations were created for age, gender, retest time interval and handedness groups. The measures of grip strength for males were highly reliable with ICC (3,1) values ranging from .91 to .97. These measures were significantly higher than that obtained from the females, where reliability values ranged from .69 to .83. Handedness played a significant part in grip strength reliability. The dominant hand of right-handed teenagers achieved an ICC (3,1) of .97, as contrasted with the non-dominant hand of left-handers who attained a very poor ICC (3,1) of .27. The shape of the hands of the males did not influence their grip strength or their reliability values, which ranged from .954 to .973. The shape of female hands did not affect their ability to generate maximal grip strength, only its reliability. The females with hands shaped squarer-than-average had mean grip strength reliability values of ICC (3,1) at only .48, in contrast to those with longer-than-average hands who achieved a mean ICC (3,1) of .92. The handle shape of the dynamometer may disadvantage square-handed females, and this should be further investigated.
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Fang, Nathan. "Perception of pinch grip force and aging." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80260.
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The ability to pinch an object precisely is an essential function of the hand. The primary objective of this experiment was to examine the effect of aging on the perception of a pinch-grip force exerted by the thumb and index finger. Twelve young (25.3 +/- 2.4 yr.) and twelve older (71.4 +/- 3.3 yr.) healthy adults executed unilateral and bilateral pinch-grip tasks with and without visual feedback. The performance of the older group was worse than that of the younger individuals when asked to reproduce a pinch force. Specifically, the older adults tended to produce an initial overshoot in force which then decreased towards the required force. However, no difference existed between the two age groups when they were asked to produce a same force with both hands simultaneously. These results suggest that the normal aging process has a more significant effect on sensorimotor memory than on the output of descending motor commands.
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Hainbuch, Friedrich [Verfasser]. "Grip strength training prevents falling / Friedrich Hainbuch." Aachen : Shaker, 2008. http://d-nb.info/1161313400/34.
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Grover, Francis M. "Intermittency between grip force and load force." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522334274008361.
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Zhang, Jing. "The correlation among three hand srength [sic] measurement methods : hand dynamometer." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1020143.
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The purpose of this study was to determine the correlation among three hand strength measurement methods: Hand dynamometer, MDD (Middle Digital Extension Isokinetic Dynamometer), and Cybex. Five students (2 males, 3 females) from Ball State University were asked to participate in this study. Both right and left lower arm data were collected from these subjects. A Cybex 340 (Lumax Cor.) was employed to determine wrist flexion and extension isokinetic peak torque, total work, and power at 30 degrees/second and 60 degrees/second. A MDD was used to determine third digit eccentric torque, work, and power. A hand dynamometer (Lafayette Instrument Co., Model 76618) was used to determine grip force. Pearson product moment correlation coefficients were used to determine correlation among these variables. Significant correlations were noted between isometric grip strength and isokinetic 30 and 60 degrees/second wrist flexion power, as well as between isometric grip strength and isokinetic 30 degrees/second wrist extensor power. The results of this study indicate there is very little relationship between the three clinically used measurement tools.School of Physical Education
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Callenberg, Mikael, and Stefan Bohman. "Utveckling av hjälpmedel för rörelsehindrade : Air Grip-1305." Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Maskinteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-21851.
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Examensarbetet är en vidareutveckling av ett föregående års arbete vars mål var att skapa en 3D-printad modell av en vakuumlift. Ett hjälpmedel för rörelsehindrade för att plocka upp föremål från marken eller trånga utrymmen. Med det som utgångspunkt har författarna tillsammans med E.MIL Energi & Miljö valt att arbeta vidare med utvecklingen av vakuumliften åt ett mer funktionsinriktat håll. Syftet med arbetet är att göra tester, analysera ingående delar och tillslut skapa en funktionsmodell på vakuumliften som tilldelats arbetsnamnet AG-1305. Genomförandet och metoden har till största del berört tester på två befintliga fläktar, en radialfläkt och en axialfläkt. Flertalet tester har genomförts med ett antal olika vanliga föremål i hushållet. Med avseende på olika faktorer har förhållanden mellan rörets längd, utformning och material kunnat göras likväl som spänningens påverkan på fläkten. Resultatet visade på klara riktlinjer av vad som är viktigt att ta i beaktande när en funktionsmodell ska skapas. Med hjälp av resultat från litteraturstudier kring batterier och ergonomi kunde en modell byggas. Modellen anpassades utifrån teknisk prestanda samt vilka krav som sattes upp, med hänsyn till ergonomisk utformning, för att möta gruppen rörelsehindrade.The work is an extension of a previous year's work, whose goal was to create a 3D-printed model of a vacuum suction. An assistant device for disabled people to pick up objects from the ground or narrow places. Based on that, the authors together with E.MIL Energy & Environment decided to work on and develop the vacuum suction to a more functionally orientated direction. The aim of this work is to make relevant tests, analyze the components and eventually create a functional model of the vacuum suction assigned the working title of AG-1305. The implementation and the method consists of tests on two existing fans, one centrifugal fan and one axial fan. Many tests have been conducted with various objects. The tests have been performed with regard to a variety of factors as the ratios of the tubes length, design and materials and as well as the voltage impact on the fan. The results showed clear guidelines of what’s important to take into consideration when a function model should be created. With the help of literature reviews on batteries and ergonomics a model could be assembled. A model well adapted in both performance and also the ergonomically requirements set up in regard of the target group that is disabled people.
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Churchill, Andrew. "Vision and grip coordination in reaching and grasping." Thesis, Lancaster University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314237.
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Fagergren, Anders. "A multidisciplinary system identification of the human precision grip /." Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-632-4.
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Capstick, John Martin. "Social expertise : a development of 'Intersubjective Maximal Grip' (IMG)." Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11175/.
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The aim of this thesis is to supplement the interactionist alternatives to folk psychology. Briefly stated, whereas the proponents of folk psychology claim that interpersonal understanding centrally involves the attribution of propositional attitudes, such as beliefs and desires, in order to predict and explain behaviour, the interactionists argue that social understanding is a skill that encompasses a number of different aspects, which includes, but is not limited to, the attribution of propositional attitudes. Since the interactionists’ arguments are relatively new in the social understanding debate, many aspects of the arguments are not fully developed and explored. For instance, Hanne De Jaegher claims that the concept of “social skill” needs further development (2009, p. 427). This thesis aims to do just that by integrating two separate debates: social understanding and expertise. Drawing on Hubert Dreyfus’ non-representational/non-propositional account of expertise, I describe, in detail, a form of social interaction (or ‘social expertise’) that does not centrally involve the attribution of propositional attitudes. Central to Dreyfus’ discussion of skillful coping is Maurice Merleau-Ponty’s concept of ‘maximal grip’ (MG), which refers to the way we seek to obtain a better perspective in a situation via our body. Building on this discussion, I develop a new concept called ‘intersubjective maximal grip’ (IMG), which describes a way we interact with others by anticipating their behaviour by recognising and responding to our respective optimal positions. In explaining this phenomenon further, I expand on Dreyfus’ discussion of MG to develop two skills related to understanding others: ‘joint optimal position recognition’ (JOPR) and ‘optimal position recognition’ (OPR). I then apply IMG to the debate about social understanding to demonstrate how IMG supplements the interactionists’ arguments against folk psychology.
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Li, Ke. "Measurement and analysis of grip strength using advanced methods." Troyes, 2009. http://www.theses.fr/2009TROY0038.
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La force de préhension palmaire est un indicateur précieux qui peut être utilisé pour décrire non seulement la fonction de la main mais également le statut global du membre supérieur voire du corps entier. Sa mesure reste plusieurs aspects à améliorer ou explorer. Cette thèse est une contribution au développement de nouvelles méthodes de mesure et d’analyse de la force de préhension palmaire. Après une analyse bibliographique approfondie, un nouveau dispositif adapté au milieu écologique est présenté. Cet outil, la Grip-Ball, consiste en un capteur de pression et un système de communication sans fil, dans une balle étanche et souple, ce qui permet de mesurer et transmettre la pression interne à la balle lors de son écrasement. Une deuxième étude s’attache à comparer un autre dispositif innovant, le Myogrip, adapté aux très faibles forces de préhension avec les deux dispositifs les plus utilisés (Jamar et Martin Vigorimètre). En outre, les effets de la position du coude et la taille de la poignée ont été testés pour ces trois dynamomètres. Le développement d’un modèle de prédiction basé uniquement sur la circonférence de la main fait l’objet d’une troisième étude, ce qui donne un modèle simple facilement utilisable en routine. Les trois derniers chapitres sont consacrés à la présentation de méthodes avancées de traitement du signal lors de contractions soutenues dans le temps: transformée de Hilbert-Huang, analyse fractale, analyse par récurrence. Ces méthodes ont montré leur aptitude à caractériser les effets de la fatigue, du tremblement, de la maladie ou de l’âge au cours de ces contractionsGrip strength is a valuable indicator that can be used to describe not only hand function, but also the overall functional status of the upper-limb strength or even of the entire body. A number of improvements could be made. The aim of this thesis is to contribute to the development of new methods of measurement and analysis of grip-strength. After an in-depth literature review of the most relevant aspects of grip-strength testing, an intelligent dynamometer for home-based testing, the Grip-Ball, is presented. This dynamometer consists of a pressure sensor and a wireless communication system, which are inserted in-side a supple, air-tight ball, in order to measure the pressure inside the ball when it is squeezed. In addition to the Grip-Ball, another innovative dynamometer, the Myogrip, which is well-suited to the measurement of very weak grip strength, was compared to two of the most widely-used dynamometers (Jamar and Martin Vigorimeter). Furthermore the investigation was performed to evaluate the effects of elbow position and of the handle sizes when using these three dynamometers. The development of simple predictive model for the maximal grip strength based solely on hand circumference is presented in a third study, with this simple model suitable for routine use. The last three chapters are devoted to the presentation of advanced methods of signal processing obtained from sustained grip-strength contractions: Hilbert-Huang transform, fractal analysis, and recurrence analysis. These methods are able to characterise the effects of fatigue, tremor, disease or age during these sustained contractions
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Anderson, Ellen, and Martin Granlöf. "Get a Grip : Dynamic force adjustment in robotic gripper." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264515.
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Autonomous mobile robots are on the rise and are to be expected on the market in about 5-10 years. Several challenges need to be solved for this to happen, and the most crucial ones are to develop versatile and safe robots. The Get a Grip robot is a dynamic force adjustment gripper using inputs from two different sensory systems. The construction of the robot consists of two parallel gripper plates moved by a rack and pinion gear attached to a direct current (DC) motor. Embedded into one of the plates is a Force Sensitive Resistor (FSR) for input of the gripper’s exerted force. Mounted to the other plate is a self constructed Slip sensor used for measuring the occurrence of slip and slip rate. A surrounding crane for mounting of the gripper and lifting was also constructed. The idea of this bachelor’s thesis project is to enable lifting of objects with unknown weight without the gripper exerting more force than necessary. This is something that will be useful in both industrial applications and in household robots in the future. In order to realize the concept two different methods for calculating the gripper’s applied force were tested, one using motor current and the other using a FSR sensor. Through testing it was concluded that the FSR sensor was the method giving better accuracy and consistency. Proportional–Integral–Derivative (PID) controllers were then tested for both setting force references for the gripper using the Slip sensor as input, and controlling the exerted force in the gripper using the FSR as input. The results led to two PID controllers thought to be sufficient as starting points for further testing of the complete system.Mobila autonoma robotar förväntas vara på marknaden inom de närmaste 5-10 åren. För att det här ska ske är det många utmaningar som behöver lösas och de mest kritiska är att utveckla mångsidiga och säkra robotar. Get a Grip-roboten är en dynamisk kraftanpassande robotklo som tar insignaler från två olika sensorsystem. Konstruktionen består av två parallella plattor som förflyttas av kuggstänger och kugghjul drivna av en DC motor. Inbyggt i en av kloplattorna finns en tryckkänslig kraftsensor (FSR) monterad för att registrera kraften som klon genererar. På den andra kloplattan sitter en egenkonstruerad glidsensor som registrerar om glidning sker och själva glidhastighet. En kran för att montera klon och lyfta den konstruerades även. Idén bakom detta kandidatexamens projektet är att klon ska kunna lyfta ett objekt med okänd vikt utan att använda mer kraft än nödvändigt. Det är något som kommer vara användbart både vid industriella tillämpningar och hos husållsrobotar i framtiden. För att realisera konceptet testades två olika metoder för att estimera kraften klon genererar, den första genom motorströmmen och den andra genom en FSR sensor. Tester genomfördes för båda metoderna och slutsatsen blev att FSR sensorn gav bäst noggrannhet och var mest konsekvent. PID-regulatorn, för bestämning av kraftreferens, med insignal från glidsensorn och PID-regulatorn, för genererad klokraft, med insignal från FSR:n testades separat. Resultatet blev två PID-regulatorer som ansågs tillräckliga för fortsätta tester med båda regulatorerna tillsammans.
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Freitas, Paulo Barbosa de. "Force coordination in object manipulation effects of load force direction and grasping technique /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 185 p, 2009. http://proquest.umi.com/pqdweb?did=1833642551&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.
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Pujol, Salud Jesús. "Influència de l'ocupació sobre el risc d'infecció i hospitalització pel virus de la grip A(H1N1)pdm09." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/401873.
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Aquest estudi va tenir com a objectiu analitzar l'existència d'una associació entre la classe social (categoritzats per tipus d'ocupació) i per analitzar les relacions entre l'exposició ocupacional i la infecció de la grip i l'hospitalització durant l'onada de pandèmia de 2009 a 2010 i l'epidèmia de grip de temporada 2010-2011 a Espanya. Aquest estudi multicèntric va comparar casos confirmats de manera ambulatòria de la grip A (H1N1) pmd09 mitjançant controls ambulatoris per mesurar el risc d'infecció, i amb casos confirmats de pacients hospitalitzats.. Les variables d'estudi van ser: edat, estat civil, tabac i alcohol, embaràs, malaltia pulmonar obstructiva crònica, insuficiència respiratòria crònica, malaltia cardiovascular, diabetis, malaltia hepàtica crònica, índex de massa corporal> 40, el tractament mitjançant corticosteroides i l’estat vacunal dels pacients. Es van registrar els casos de manera literal i es van agrupar segons la classe social i l’ocupació en el cas dels treballadors manuals i no manuals. Els llocs de treball es van classificar també pel que feia al seu alt, mitjà o baix risc d'exposició a la grip. Es va realitzar una anàlisi de regressió logística condicional. Hi havia 720 casos hospitalitzats de grip confirmada per transcripció inversa de la polimerasa-reacció en cadena (RT-PCR), 996 casos ambulatoris i 1062 controls ambulatoris inclosos en l'estudi. No s'ha trobat relació entre la classe social ocupacional i A (H1N1), la infecció pmd09 [quocient de probabilitats ajustat (ORA) 0 · 97, 95% interval de confiança (CI) 0,74-1,27], sinó una associació (ORA 1,53, IC del 95% 1.01- es va observar 2,31) entre la classe ocupacional i hospitalització per a pmd09 (H1N1). El grup d'alt risc d'exposició ocupacional es compon exclusivament de treballadors de la salut. Després d'ajustar per edat, sexe, estat de vacunació i les variables de predicció d'infecció per grip, els pacients amb un alt risc d'exposició ocupacional tenien un AOR de 2,14 (IC del 95%: 1,25-3,66) de ser un cas de grip ambulatòria i un AOR de 0,43 ( IC del 95%: 0,20 fins a 0,95) de ser un cas de la grip per a pacients hospitalitzats, en comparació amb aquells amb un baix risc. La vacunació contra la grip era un factor de protecció per a A (H1N1), la infecció pmd09 (ORA 0 · CI 41, 95% 0 · 23-0 · 73) però no per a l'hospitalització. Arribem a la conclusió que els treballadors manuals tenen el major risc d'hospitalització quan estan infectades per la grip que altres ocupacions, però que no tenen una probabilitat diferent d'estar infectats per la grip. Un alt risc d'exposició ocupacional és un factor de risc per a la infecció per influença, però no per a l'hospitalització. L'efectivitat ajustada de vacunació contra la grip va ser del 59% (IC del 95%: 27% -77%) quan es comparen els casos de grip ambulatòria amb els pacients ambulatoris sense símptomes de la grip i va aconseguir el 74% (IC 95%: 42% -88%) quan es consideren els riscos laborals.This study aimed to analyze the existence of an association between social class (categorized by type of occupation) and to analyze relationships between occupational exposure and influenza infection and hospitalization during the 2009-2010 pandemic wave and the 2010-2011 influenza seasonal epidemic in Spain. This multicentre study compared ambulatory A(H1N1)pmd09 confirmed cases with ambulatory controls to measure risk of infection, and with hospitalized A(H1N1)pmd09 confirmed cases to asses hospitalization risk. Study variables were: age, marital status, tobacco and alcohol use, pregnancy, chronic obstructive pulmonary disease, chronic respiratory failure, cardiovascular disease, diabetes, chronic liver disease, body mass index >40, systemic corticosteroid treatment and influenza vaccination status. Occupation was registered literally and coded into manual and non-manual worker occupational social class groups. Occupations were classified also as high, medium or low risk of influenza exposure. A conditional logistic regression analysis was performed. There were 720 hospitalized cases of influenza confirmed by reverse-transcription polymerase-chain-reaction (RT-PCR), 996 ambulatory cases and 1062 ambulatory controls included in the study. No relationship between occupational social class and A(H1N1)pmd09 infection was found [adjusted odds ratio (aOR) 0·97, 95% confidence interval (CI) 0.74–1.27], but an association (aOR 1.53, 95% CI 1.01–2.31) between occupational class and hospitalization for A(H1N1)pmd09 was observed. The high risk of occupational exposure group was composed only of health care workers. After adjustment for age, sex, vaccination status and predictive variables of influenza infection, patients with a high risk of occupational exposure had an aOR of 2.14 (95%CI: 1.25-3.66) of being an outpatient influenza case and an aOR of 0.43 (95%CI: 0.20-0.95) of being an inpatient influenza case, compared with those with a low risk. Influenza vaccination was a protective factor for A(H1N1)pmd09 infection (aOR 0·41, 95% CI 0·23–0·73) but not for hospitalization. We conclude that manual workers have the highest risk of hospitalization when infected by influenza than other occupations but they do not have a different probability of being infected by influenza. A high risk of occupational exposure is a risk factor for influenza infection but not for hospitalisation. The adjusted effectivity of influenza vaccination was 59% (95% CI: 27%-77%) when comparing outpatient influenza cases with outpatients without influenza symptoms and reached 74% (IC 95%: 42%-88%) when considering occupational risk.
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Wagner, Gerhard Walter. "Die kosmogenen Radionuklide ¹°Be und ³⁶Cl im Summit-GRIP-Eisbohrkern /." Zürich, 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=12864.
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Kleinholdermann, Urs Johannes [Verfasser]. "Kinematics and control of precision grip grasping / Urs Johannes Kleinholdermann." Gießen : Universitätsbibliothek, 2012. http://d-nb.info/1063953650/34.
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Zakaria, Mahmoud. "Un protocole générique pour les environnements repartis à objets : grip." Paris, ENST, 1997. http://www.theses.fr/1997ENST0049.
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Nous proposons, dans cette thèse, d'apporter une contribution théorique et pratique pour la conception, la spécification et l'implantation d'un protocole de communication générique que nous avons appelé grip (generis remonte invocation protocol) pour les environnements repartis à objets. Tout d'abord, le protocole grip est capable, tout en restant générique et flexible, d'intégrer des concepts avances et nouveaux qui permettent de répondre au mieux aux besoins d'applications très diverses. Ses propriétés qualitatives et quantitatives sont évaluées par rapport aux solutions standards iiop corba de l'omg et rpc dce de l'osf. De plus, grip peut être utilise pour résoudre le problème de coexistence et d'interopérabilité entre ces solutions standards avec lesquels il inter opère en mode natif. Grip est également à la base d'une proposition de canevas que nous avons appelé gif (generic interoperability framework) pour le support des communications dans le cadre du modèle de référence odp (open distributed procession). Ainsi, les deux protocoles iiop et rpc dce peuvent être vus comme deux profils particuliers de gif. Enfin, une version fiabilisée de grip a été réalisée pour améliorer sa résistance aux défaillances et offrir un support aux applications transactionnelles. Cette extension, que nous avons appelé t-grip, est le résultat d'une intégration avec le protocole osi tp (transaction processing). Grip est actuellement implante sur tcp/ip. Son extension transactionnelle tgrip a été réalisé par une intégration du protocole grip avec le moniteur transactionnel maao développe a l'inria et intégrant osi tp. Egalement, un orb appelé orbite (orb interopere, transactionnel et extensible) à base de grip a été développe a la der/edf. Le protocole grip a fait l'objet de contribution aux organismes de normalisations (iso, omg).
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Zakaria, Mahmoud. "Un protocole générique pour les environnements répartis à objets : GRIP /." Paris : École nationale supérieure des télécommunications, 1998. http://catalogue.bnf.fr/ark:/12148/cb37007399r.
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Eriksson, Henry. "Evaluating carton board crease geometries regarding grip stiffness using Syntouch Biotac." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-61955.
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A pilot study comparing the influence by different crease geometry on the grip stiffness of carton board packages has been executed. For this purpose, Syntouch Biotac, Lloyd LR5K tensiletester and crease measurements have been used. In total, 40 packages were manufactured and tested for this report. It was found that different crease geometries do have an effect on the difference in stiffness before and after collapse load. It was also found that vibration signals from Syntouch Biotac could be used to differentiate between different crease geometry at the instant of collapse load in the majority of cases. For continued work it is proposed that the same method used in this report should be applied on a larger number of packages. This is proposed so that a more thorough statistical analysis can be performed. It is also proposed, for continued work, that the interlaminar bonds between the plies of the carton boards be examined to gain a better understanding of the damage progress at the instant of collapse load.En förstudie över fyra olika big-geometriers inverkan på greppstyvhet av kartongförpackningar har utförts. Syntouch Biotac, tryckprovare och bigmätningar har använts för ändamålet. Totalt har 40 kartongförpackningar tillverkats och testats för denna rapport. Det fanns att big-geometrier har en inverkan på skillnaden mellan styvhet innan och efter kollapslast av kartongförpackningen. Det fanns även att vibrationsutslag från Syntouch Biotac kunde skilja olika big-geometrier åt vid kollapslast i majoriteten av fall. Till fortsatt arbete föreslås att använda likadan metod på flera kartongförpackningar för att kunna utföra en nogrannare statistisk analys samt att undersöka styrkan hos de interlaminära bindningarna mellan kartongskikten för att bättre förstå skadeförloppet vid kollapslast.
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Canyock, John David. "The effect of three positions of shoulder flexion on grip strength." FIU Digital Commons, 1997. http://digitalcommons.fiu.edu/etd/2032.
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This study investigated the effect of shoulder position on grip strength in 30 female students from Florida International University. A Jamar dynamometer was used to measure the grip strength in three testing positions (0,90 and 135 degrees of shoulder flexion with full elbow extension). The highest mean grip strength measurement was found at 135 degrees of shoulder flexion, followed by 0 degrees and then 90 degrees. An ANOVA indicated that there was a significant difference between at least two of the three positions. A Fisher's LSD post hoc test indicated that mean grip strength at 135 degrees of flexion was significantly higher than at 0 and 90 degrees of flexion.
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Dalal, Isha. ""I will not grip" writing identity in Sara Suleri's Meatless Days /." Diss., Connect to the thesis, 2007. http://hdl.handle.net/10066/991.
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Pettersson, Herman, and Rickard Ambros. "Avlastningsarmstöd till Grip-it : Optimal positionering av övre extremitet vid gripstyrkemätningar." Thesis, Högskolan i Halmstad, Biomekanik och biomedicin, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-22442.
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In today’s technological society, there are increasingly less physical demands on the locomotor system. However, despite that notion strength and function in the hand’s complex biomechanical system are in fact both needed to cope with daily life. The grip function is a main function in the hand and is used in many examples of scientific research, for instance when assessing physical health and predicting the probabilities of premature mortality. A newly developed tool for assessing grip strength is Grip-it which today lacks support for the arm which would offer a standardized measured position for the upper extremity. The objective of this project was to design and evaluate a support for the arm that positions the upper extremity for maximum power capacity when assessing the amount of grip strength. A dynamic product development based on anthropometrical data has been applied to design a support for the arm with focus on the user. Literature surveys, preliminary studies and an evaluation of clinical personnel have provided the basis for a functional prototype, developed in close contact with the industry, and is now ready for user tests. The group of the project is of the opinion that there are good possibilities of developing a finished product, which would enable a standardized positioning when assessing the amount of grip strength with Grip-it. With new technology, Grip-it expands possibilities of analyzing grip strength assessments and can lead to an expanded research and understanding of these assessments, subsequently applicable to rehabilitation, various sports and evaluations of certain actions taken, such as surgical ones.I dagens tekniska samhälle ställs allt mindre fysiska krav på rörelseapparaten. Trots det så krävs styrka och funktion i handens komplexa biomekaniska system för att klara av det dagliga livet. Gripfunktionen är en huvudfunktion i handen och används i flertalet forskningssyften, exempelvis vid bedömning av fysisk hälsa och att förutspå tidig dödlighet. Ett nyutvecklat mätinstrument för gripstyrka är Grip-it som idag saknar avlastningsarmstöd som möjliggör standardiserade mätpositioner för övre extremitet. Projektets syfte var att designa och utvärdera ett avlastningsarmstöd som positionerar övre extremitet för maximal kraftutveckling vid gripstyrkemätningar. För att designa ett avlastningsarmstöd, med användaren i centrum, har dynamisk produktutveckling utifrån antropometriska data tillämpats. Litteraturstudier, genomförd förstudie och utvärdering av klinisk personal har legat till grund för en funktionell prototyp som tagits fram i nära kontakt med näringslivet och nu är redo för användartester. Projektgruppen anser att det finns goda möjligheter för utveckling till färdig produkt, vilket skulle möjliggöra standardiserad positionering vid mätning av gripstyrka med Grip-it. Med ny teknik utökar Grip-it möjligheterna att analysera gripstyrkemätningar och kan leda till en utökad forskning och förståelse som sedan är applicerbar inom rehabilitering, olika sporter samt utvärdering av ingripanden, såsom kirurgiska ingrepp.
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Gamil, Morkos Hosny Fakhry. "Development of clinical real time endoscopic tissue grip compliance mapping system." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520832.
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Kanellopoulos, Asimakis K. "Three dimensional biomechanics of the hand and wrist in precision grip." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=16788.
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Dodds, Richard. "A cross-cohort investigation of grip strength across the life course." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/396927/.
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Introduction: Grip strength across the life course is associated with disability, morbidity and mortality, and forms a key component of the sarcopenia and frailty phenotypes in older people. However it is unclear how individual measurements of grip strength should be interpreted. My objectives were to produce centile values for grip strength across the life course in Great Britain (GB), and then to compare with those in international settings. Methods: I combined data from 12 general population studies in GB to produce centile curves using the Box-Cox Cole and Green distribution. I estimated the prevalence of weak grip, defined as at least 2.5 SDs below the gender-specific peak mean. I then did a systematic literature search and expressed the resulting international normative data as Z-scores relative to my British centiles. I used metaregression to pool these by world region. Results: I combined 60,803 grip strength observations from GB at ages 4 to 90. I saw an increase to a peak median in early adulthood of 51kg in males and 31kg in females, maintenance to midlife and then decline. The prevalence of weak grip increased with age, reaching 23% in males and 27% in females by age 80. My systematic literature search returned 60 papers containing 730 international normative data items. Those from developed regions were similar to my GB centiles, pooled Z-score 0.12 (95% CI: 0.07, 0.17), whereas those from developing regions were clearly lower, pooled Z-score -0.86 (95% CI: -0.95, -0.77). Conclusion: My GB centiles are the first to cover the entire life course. Published normative data showed a similar pattern, but with clear differences in magnitude between developing and developed regions. The findings have the potential to inform the clinical assessment of grip strength, recognised as an important part of the identification of people with sarcopenia and frailty.
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Born, Megan L. "Relationship of Grip Strength and Range of Motion in Baseball Players." Marietta College Honors Theses / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=marhonors1335981033.
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Grover, Francis M. "Control of Grip During Extended Manipulations of a Mechanically Complex Object." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1602152657050898.
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Norman, Jacob. "3D POSE ESTIMATION IN THE CONTEXT OF GRIP POSITION FOR PHRI." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55166.
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For human-robot interaction with the intent to grip a human arm, it is necessary that the ideal gripping location can be identified. In this work, the gripping location is situated on the arm and thus it can be extracted using the position of the wrist and elbow joints. To achieve this human pose estimation is proposed as there exist robust methods that work both in and outside of lab environments. One such example is OpenPose which thanks to the COCO and MPII datasets has recorded impressive results in a variety of different scenarios in real-time. However, most of the images in these datasets are taken from a camera mounted at chest height on people that for the majority of the images are oriented upright. This presents the potential problem that prone humans which are the primary focus of this project can not be detected. Especially if seen from an angle that makes the human appear upside down in the camera frame. To remedy this two different approaches were tested, both aimed at creating a rotation-invariant 2D pose estimation method. The first method rotates the COCO training data in an attempt to create a model that can find humans regardless of orientation in the image. The second approach adds a RotationNet as a preprocessing step to correctly orient the images so that OpenPose can be used to estimate the 2D pose before rotating back the resulting skeletons.
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Townsend, Benjamin Robert. "Primary motor cortical-cerebellar interactions in the control of precision grip." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/1446136/.
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The primary motor cortex (Ml) and cerebellum are strongly interconnected structures. For control of the arm and hand, the cerebellum must influence other parts of the motor network with direct access to the spinal cord, since it has no descending projections to the lower cervical cord itself. One important control pathway involves interactions of the cerebellum with Ml. This thesis describes findings from simultaneous recording of neuronal activity in these structures, with the aim of addressing how they interact. Recordings were made from Ml and cerebellar dentate nucleus in macaque monkeys performing a precision grip task. Multiple single units and local field potentials (LFP) were sampled, concurrent with EMG from hand muscles. A variety of approaches were then taken to assess Ml-cerebellar communication. Correlations of neural discharge in Ml and cerebellum with muscle activity were evaluated. Evidence was found for linear encoding of muscle activity in both areas. Different output pathways of Ml to cerebellum were identified and studied at the single neuron level. Neurons in each pathway were interconnected and showed similar activity patterns. Functional connectivity between the two structures was investigated, by compiling spike-triggered averages (SpTAs) of local field potentials, and stimulus-triggered averaging of single units. Finally, firing rates and LFP activity within these structures were monitored across different load conditions during blocked and randomized trial sequences. Ml and cerebellar activity was dissociated between these conditions, highlighting the role of the cerebellum in predictive control of grip force. Coupling of oscillatory LFP activity between these structures was consistently observed across task conditions. It is suggested that SpTA effects and coherent LFPs represent communication across short and broad time scales respectively. Overall, this research demonstrates how simultaneous recordings can provide new insights into the roles of Ml and cerebellum in the control of hand movements.
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Summerlin, Ashley Nicole. "A Repertoire Guide Including Annotations of High School Level Keyboard Percussion Works for Four Mallets." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555496091962409.
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Abrahamsson, Filip, and Jimmy Björklin. "Hur muskelaktiveringen påverkas vid en inåtrotation i axelleden med och utan Activation Grip." Thesis, Högskolan i Halmstad, Biomekanik och biomedicin, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-18069.
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Bakgrund: Även om kaströrelsen i detalj skiljer sig mellan olika idrotter så är den biomekaniska funktionen i grunden densamma. Inom alla kastrelaterade idrotter återkommer den så kallade accelerationsfasen, här har det visat sig att inåtrotationen i axelleden har en hög korrelation med bollhastighet i kaströrelsen. Axelledens inåtrotatorer har alltså en viktig funktion för ett effektivt kast. En funktionell uppvärmning av dessa strukturer optimerar prestationsförmågan och minskar skaderisken. Kan träningsredskapet Activation Grip (AG) effektivisera uppvärmningen av den övre extremiteten hos kastidrottare? Syfte: Att undersöka och jämföra hur muskelaktiviteten i m. pectoralis major (PM), m. deltoideus anterior (DA), m. flexor carpi raidalis (FCR) och m. extensor digitoris communis (EDC) påverkas vid inåtrotation i axelleden med och utan träningsredskapet AG. Studien syftar även till att utvärdera AG som produkt. Metod: Muskelaktiviteten i PM, DA, FCR och EDC registrerades med hjälp av elektromyografi (sEMG) hos 18 aktiva idrottare inom överarmskastrelaterade idrotter (ålder 23,7 ± 5,7) vid inåtrotation i axelleden med maximal hastighet, jämfört med samma rörelse med AG och 30% belastning. Resultat: Resultatet visade på en signifikant högre muskelaktivering (p < 0.05) i DA, FCR, EDC under inåtrotationen med maximal hastighet. Hos PM sågs ingen signifikant skillnad i muskelaktivitet. AG fick över lag positiv respons från testdeltagarna. Konklusion: Med resultatet i beaktande så skulle AG kunna kombineras tillsammans med andra uppvärmningsövningar för att få specifik aktivering i önskad muskulatur. Vidare studier gällande rörelse, motstånd och hastighet för att effektivisera användningen av AG bör göras. Även om AG fick positiv respons så bör produkten utvecklas ytterligare.
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Vonmoos, Maura Valeria. "Rekonstruktion der solaren Aktivitäten im Holozän mittels Beryllium-10 im GRIP Eisbohrkern /." Zürich : ETH, 2005. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16224.
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Savage, Nicholas James, and nicolasshu709@hotmail com. "Vibration absorption in the tennis grip and the effects on racquet dynamics." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080522.153134.
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The modern game of tennis has changed in recent years as a result of lightweight, stiffer racquets. The evolution of the tennis racquet, with respect to both design and materials, has increased the speed of the game but also the levels of stress placed on the player's bodies. Many believe that injuries such as lateral epicondylitis (tennis elbow) are caused and aggravated by the absorption of racquet energy by the player, in the form of shock and vibration. This thesis presents an experimental investigation into the absorption of racquet vibration to the player's hand and forearm. Quantification of the tennis grip has been achieved in this research using different experimental techniques to analyse different aspects of the tennis grip. Grip pressure distribution profiles during impact have been established using both pressure sensitive film and real-time data acquisition methods. Quantification of grip tightness during impact, together with gripping times, has also been quantified using a strain gauge cantilever system manufactured specifically for this research. The experimental data acquired in this research has provided the base for grip pressure distribution profiles to be established for three stroke types (e.g. Forehand, service and the problematic backhand). The profiles depict the distribution of pressure in the tennis grip in relation to the ball impact, in the time domain. Based on these grip profiles, the research hypothesises hand movements in an attempt to establish muscle contractions (and moreover locations of vibration absorption) specific to stroke types. The research investigates the absorption of racquet vibrations by the player's hand in the time domain. Filtering of accelerometer data allows for the isolation of specific frequencies of interest (i.e. below 200Hz). Logarithmic decrement of racquet vibration has been calculated and related to the grip pressure distributions in the time domain, and the relationship between grip pressure and vibration damping has been modelled. The correlation between grip pressure and the logarithmic decrement has been show to be significant (p less than 0.005) and non-linear. The relationship between the tennis grip and the damping of racquet vibrations has been found to be dependant on both grip pressure and the proximity of grip pressure application in proximity to the handle node. Grip pressure applied to the racquet close to the handle node has a greater damping effect than a similar pressure further away. In addition to these key research findings, the effectiveness of a piezoelectric racquet damping system is also investigated. A comprehensive modal analysis of two tennis racquets is given with further ball impact tests. The ball impact tests showed that the damping system has a 28% difference in racquet vibrations during freely suspended grip conditions. However, under hand-held grip conditions the inclusion of grip damping into the system provides a much greater damping entity (880% greater). Therefore, the effect of the piezoelectric system was deemed to be negligible.
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Bakhtiar, Siavash. "Minor grip : on the constitution of morality, agency and affectivity with technology." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52177/.
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The purpose of this thesis is to establish a conversation between Bruno Latour and the work of contemporary philosophers and critical theorists in order to develop their respective approaches to articulate a critical theory about technology. To analyse these different perspectives, the thesis follows a conceptual framework based on what Latour calls the “principle of symmetry” between human and non-humans actants that take part in the constitution of what we call society. Through focusing on different “thing theories,” the thesis works to recuperate some of these concepts and practices to enrich my own conceptual toolbox. Each chapter focuses on a particular case study – the revolving door, the Automated Public Toilet, barbed wire and the smartphone – that gives me the ground where I put at test these different perspectives to see if they can be good theoretical allies to give more space in critical theory for what Latour calls its 'missing masses'.
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Roesch, J. Richard. "Hand grip performance with the bare hand in the extravehicular activity globe." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91148.
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Astronauts have complained of difficulty in grasping tools, hand fatigue, and hand/forearm pain during extravehicular activities. This study was conducted to examine hand grip performance with a bare hand and in a spacesuit glove at two different pressures, with three hand positions and two elbow positions. Sixteen subjects, selected from the suited-subject pool at the Johnson Space Center, gripped a hand dynamometer encased in a vacuum chamber designed to simulate the operating pressures in space. The results for the bare hand condition showed a significant effect for hand position and a significant elbow/hand interaction. The spacesuit glove at operating pressure was responsible for an average 42% grip strength decrement from the bare hand condition. A new procedure for determining hand size from projected hand surface area revealed that bare and gloved-hand grip strength was highly correlated with hand size, as were body weight, height, and forearm circumference.M. S.
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Stout, Molly L. "Discrimination between sincere and deceptive isometric grip response using Segmental Curve Analysis." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040415/.
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Johansson, Diana, and Nicole Sindelar. "Tactility and grip : A study of human perception, materials and contact surfaces." Thesis, KTH, Maskinkonstruktion (Inst.), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172040.
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Vid utveckling av nya produkter är det viktigt att dessa har en attraktiv och ergonomisk design för att locka nya kunder, men det är lika viktigt att framställa en produkt som känns bra. Hur handen och dess känsel fungerar är viktigt att förstå vid materialval. Syftet med detta projekt är att få en djupare förståelse för hur cirkulära material skall designas med avseende på komfort och funktion men även att få bättre kunskap om hur handen reagerar på olika material när den håller i cirkulära handtag med ett kraftgrepp. Förstudier gjordes för att få mer kunskap om hur handen och dess grepp fungerar och vilka material som används på verktyg idag. I detta projekt undersöktes sex olika plast- och gummimaterial; PVC, polypropen, polyeten, silikon, neopren och polyuretan, vilka alla är vanliga material på verktygshandtag. Subjektiva och objektiva analyser så som mätning av kontaktytor när handen håller i cirkulära handtag, mätning av friktionskoefficienten mellan hand och material och enkäter om materialens egenskaper utfördes. Studien avgränsades till enbart cirkulära handtag och kraftgrepp undersöktes med och utan belastning.PVC var det material som visade sig ha högst friktion medan polyuretan hade den lägsta. Neopren blev rankad som det mest lämpade materialet för ett verktygshandtag både vid användning och utan belastning. Önskvärda egenskaper för verktyghandtagsmaterial vid användning var semi-mjuk, matt, semi-grov med en friktionskoefficient mellan 0.78–0.86. När handtagen inte belastades blev de önskvärda egenskaperna för ett material; semi-mjuk matt, grov och en friktionskoefficient på 0.86. Kontaktytorna med högst tryck förändrades då handtaget belastades. Både tryckfördelning och vilka ytor som aktiverades förändrades medan ytan mellan tumme och pekfinger förblev densamma. Trycket var mer jämnt fördelat över de tryckytor som uppstod då försökspersonen endast höll i handtaget och blev högre och mer ojämnt fördelat över dessa ytor vid belastning. Uppfattningen av ett grepp och ett material blev tydligare efter att handtaget blivit belastat än utan belastning.When developing new hand tools a good and ergonomic design is very important to attract potential customers, but it is equally important to make a product that feels good. How the hand and its fingering work is important to understand when materials are chosen. The purpose of the study is to get a deeper knowledge about how circular handles should be designed in regard to comfort and function as well as to how the hand reacts to different materials when holding a circular handle in a power grip. Initially, pilot studies were conducted to better understand how the human hand works, its grip and which materials are used in today’s tools. In this project six different rubber and plastic materials, PVC, polypropylene, polyethylene, silicone, neoprene and polyurethane, all very common on tool handles, were studied. Subjective and objective experiments such as measuring contact surfaces when holding a circular handle, friction coefficient between the hand and materials and surveys about material properties were made. Limitations were made so that only circular handles and power grips were studied, both when in use and not in use.The material with the highest friction coefficient was PVC whereas polyurethane had the lowest. Neoprene was perceived as the most suited material for a circular tool handle, both when in use and not in use. Desirable properties for a tool handle when in use were semi-soft, matt, semi-rough with the friction coefficient between 0.78- 0.86. When not in use, desirable properties were semi-soft, matt, rough with the friction coefficient 0.86. Both the pressure distribution and the activated areas changed when the handle was used. However, the area between the thumb and the finger remained consistent both in use and not in use. The pressure was more evenly distributed among the high pressure areas when holding the handle but was higher and more unevenly distributed over these areas when the handle was used. The perception of a grip and material became more certain when the handle was under load.
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Kautz, Linda Louise. "Evaluation of the hand grip dynamometer as a tool for nutritional assessment." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184542.
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The purpose of this study was to explore utility of handgrip strength measured by the hand-grip dynamometer for assessment of nutritional status in protein-calorie malnutrition. The first study included six subjects (all right-handed), who had grip strength measured daily for five days, then weekly for three weeks. Intra-individual variability was approximately 10%. No learning or training effect was observed. Change in leg position from feet on the floor to elevation of feet made no significant difference in grip-strength measurement. In Phase Two, 43 healthy adult subjects (three left-handed) prior to elective surgery, height was significantly related to handgrip strength (r = 0.82, p < 0.001). Males were stronger than females. After surgery, the non-dominant hand lost significant strength (2.68 kilograms) and recovered more quickly than the dominant hand. Multiple regression analyses provided predictive equations for pre-surgery left hand-grip strength using age, sex, and height (R² = 0.77); from age, sex, hand measured, and grip strength two days after surgery or three days after surgery (R² = 0.89 for each). Ten sequential grip-strength measurements analyzed by repeated measures analysis of variance with orthogonal comparisons showed a difference in measurements between hands as well as before and after surgery. The slope of the measurement line was more linear before and three days after surgery, but more quadratic in shape two days after surgery. The effects seen by type of surgery were inversion of the slope of right hand sequential measurements two days after knee surgery and before-surgery drop and increase from trial five to trial seven in left hand sequential measurements of knee and vaginal hysterectomy subjects. In a six-month-long case study, grip-strength measurements were followed in a seriously-ill 68-year-old patient hospitalized for surgical repair of hiatal hernia and mucous fistula who underwent several periods of nutritional depletion. Grip strength varied throughout the period (although not differently from healthy subjects), but did not directly parallel changes in serum albumin or prealbumin. The conclusion was that hand strength measured by the handgrip dynamometer did not change enough with fasting and surgery from normal day-to-day variability to be useful for nutritional assessment.
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Augurelle, Anne-Sophie. "Feedback and feedforward processes underlying grip-load force coupling during cyclic arm movements." Université catholique de Louvain, 2003. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-06292007-114349/.
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During transport of hand-held objects, the grip force is modulated in parallel with the load force changes. The control scheme underlying this grip-load force coupling involves subtle interplay between feedforward and feedback mechanisms. Based on internal models of the motor system and object properties, the load force can be predicted and the GF motor command can be specified in a feedforward manner. Moreover, during the course of arm movement, the CNS is informed by sensory feedback about mechanical events such as the lift-off of the object, slippage or excessive grip force. This information is used to correct the motor commands and to update the internal model of the motor apparatus and object. In this thesis, three experiments were conducted to examine the relative contributions of sensory-driven and anticipatory control of GF adjustments during cyclic vertical movement with a hand-held load. The main point was to assess whether internal models underlying the grip-load force coupling are robust when the environmental context was changed or when the sensory feedback was suppressed. Two experiments in parabolic flight were conducted to study the effects of a change in gravity on the dynamics of prehension. The main perturbation was that the novice subjects applied unnecessarily high safety margins during their first trial at 0 and 1.8 g in order to secure the grasp insofar as the gravitational component of the load force was unpredictable. By contrast, the temporal coupling between GF and LF was maintained regardless of the gravity conditions because the inertial component of the load could be still predicted from the arm motor command (efference copy). In the second study performed during parabolic flight, we have observed that the subjects were able to exert the same grip force for equivalent load generated either by a change of mass, gravity or acceleration despite the fact that it requires different arm motor commands. These two experiments brought further evidence that the predictive mechanisms largely contribute to the GF adjustment. Static forces such gravity are taken into account in the motor plan allowing adequate motor command and precise prediction of the incoming load force change. The GF output would depend on the precision of this prediction that can be evaluatedonly after the movement onset through sensory information about the actual state of the system. The third experiment performed in this thesis studied the role of cutaneous afferents in object manipulation by anesthetizing the thumb and index finger. In addition to their phasic slip-detection function, the cutaneous afferents are required for setting the background level of the grip force. Actually, in absence of tactile feedback, the temporal coupling between the grip and load forces is maintained but the mean magnitude of GF progressively decreases leading to object slipping. It is hypothesized that accumulating error occurred in the LF prediction leading to inadequate level of GF. Cutaneous afferents are thus required to correct and maintain the internal model of the arm-hand object system.
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Schmidt, Erin R. "Measurement of grip force and evaluation of its role in a golf shot." Thesis, Loughborough University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479450.
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