Academic literature on the topic 'Stretch-shortening cycle (SSC)'

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Journal articles on the topic "Stretch-shortening cycle (SSC)"

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Sahrom, Sofyan B., John B. Cronin, and Nigel K. Harris. "Understanding Stretch Shortening Cycle Ability in Youth." Strength and Conditioning Journal 35, no. 3 (June 2013): 77–88. http://dx.doi.org/10.1519/ssc.0b013e318295560a.

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Wadden, Katie P., Duane C. Button, Armin Kibele, and David G. Behm. "Neuromuscular fatigue recovery following rapid and slow stretch–shortening cycle movements." Applied Physiology, Nutrition, and Metabolism 37, no. 3 (June 2012): 437–47. http://dx.doi.org/10.1139/h2012-020.

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The purpose of this study was to investigate underlying mechanisms and neuromuscular recovery patterns following rapid and slow stretch–shortening cycle (SSC) movements performed to fatigue. Fourteen (10 moderately trained (MT) and four highly trained (HT)) subjects completed rapid and slow SSC movements to fatigue. The rapid SSC movement consisted of continuous drop jumps from a 30 cm platform until a predetermined jump height was no longer maintained, and the slow SSC movement consisted of continuous squats to 90° of knee flexion at a load of 65% of subject’s one-repetition maximum until no further repetitions could be completed. Although blood lactate measures were significantly (p < 0.002) higher after the rapid SSC condition versus after the slow SSC condition, the recovery of neuromuscular properties (maximum voluntary contractions, twitch force, muscle compound action potential) following the two conditions to fatigue did not differ. The duration of the rapid SSC movement was dependent on the training status of the subject; HT subjects performed the rapid SSC longer (68.2%) than the MT subjects until fatigued. Thus, the neuromuscular fatigue recovery patterns were independent of the type of SSC movement, condition duration, and subject training status. Because rapid and slow SSC exercises induce similar fatigue patterns, training programs incorporating rapid SSC exercises can be developed similar to that prescribed in traditional slow SSC resistance training programs.
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Rice, Paige E., Herman van Werkhoven, Edward K. Merritt, and Jeffrey M. McBride. "Lower Leg Morphology and Stretch-Shortening Cycle Performance of Dancers." Journal of Applied Biomechanics 34, no. 3 (June 1, 2018): 211–19. http://dx.doi.org/10.1123/jab.2017-0206.

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Greater levels of bone ultimate fracture load, bone stress–strain index, muscle cross-sectional area, and maximal voluntary isometric plantarflexion (MVIP) strength of the lower leg may be adaptations from chronic exposure to stretch-shortening cycle (SSC) actions. Dancers, a population that habitually performs SSC movements primarily about the ankle joint, may serve as a novel population to gain broader understanding of SSC function. A total of 10 female collegiate dancers and 10 untrained controls underwent peripheral quantitative computed tomography scans of both lower legs and performed MVIPs, countermovement hops, and drop hops at 20, 30, and 40 cm on a custom-made inclined sled. Dancers had greater right and left ultimate fracture load values and significantly (P ≤ .05) greater left leg stress–strain index than controls. Dancers had significantly larger right and left muscle cross-sectional area and MVIP values and hopped significantly higher during all hopping conditions in comparison with controls. Average force–time and power–time curves revealed significantly greater relative force and power measurements during the concentric phase for all hopping conditions in dancers when compared with controls. This investigation provides evidence that dance may be a stimulus for positive muscle and bone adaptations, strength levels, and enhanced SSC capabilities.
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Turner, Anthony N., and Ian Jeffreys. "The Stretch-Shortening Cycle: Proposed Mechanisms and Methods for Enhancement." Strength and Conditioning Journal 32, no. 4 (August 2010): 87–99. http://dx.doi.org/10.1519/ssc.0b013e3181e928f9.

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Moeskops, Sylvia, Jason S. Pedley, Jon L. Oliver, and Rhodri S. Lloyd. "The Influence of Competitive Level on Stretch-Shortening Cycle Function in Young Female Gymnasts." Sports 10, no. 7 (July 6, 2022): 107. http://dx.doi.org/10.3390/sports10070107.

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This cross-sectional study investigated how stretch-shortening cycle (SSC) function and kinetic variables differed between young female gymnasts of varying competitive levels. Drop jump (DJ) force–time profiles were examined in 118 female gymnasts, sub-divided by competitive level (n = 21 recreational, n = 41 regional and n = 50 elite). DJ force–time data were analyzed to calculate performance and kinetic variables. Participants’ SSC function was categorized as poor, moderate, or good, depending on the presence of an impact peak and spring-like behavior. A high proportion of gymnasts across each group were categorized as having “good” or “moderate” SSC function (i.e., >94.8%), with a trend of increasingly better SSC function observed with competitive level. Significant differences in reactive strength index, contact time, time of landing peak force, relative propulsive peak force, impulse, and ratio of braking: propulsive impulse were found between the elite and recreational group (p < 0.05). While SSC function was generally good to moderate, elite gymnasts had a more desirable kinetic jump-landing strategy than recreational level gymnasts. Drop jump kinetic variables appear to distinguish between elite and recreational gymnasts but not between regional standard gymnasts. Practitioners should consider the kinetic profile of gymnasts when benchmarking and setting training objectives.
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Toumi, Hechmi, Georges Poumarat, Thomas M. Best, Alain Martin, John Fairclough, and Mike Benjamin. "Fatigue and muscle–tendon stiffness after stretch–shortening cycle and isometric exercise." Applied Physiology, Nutrition, and Metabolism 31, no. 5 (October 2006): 565–72. http://dx.doi.org/10.1139/h06-034.

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The purpose of the present study was to compare vertical jump performance after 2 different fatigue protocols. In the first protocol, subjects performed consecutive sets of 10 repetitions of stretch–shortening cycle (SSC) contractions. In the second protocol, successive sets of 10 repetitions of isometric contractions were performed for 10 s with the knee at 90° of flexion. The exercises were stopped when the subjects failed to reach 50% of their maximum voluntary isometric contractions. Maximal isometric force and maximal concentric power were assessed by performing supine leg presses, squat jumps, and drop jumps. Surface EMG was used to determine changes in muscle activation before and after fatigue. In both groups, the fatigue exercises reduced voluntary isometric force, maximal concentric power, and drop jump performance. Kinematic data showed a decrease in knee muscle–tendon stiffness accompanied by a lengthened ground contact time. EMG analysis showed that the squat and drop jumps were performed similarly before and after the fatigue exercise for both groups. Although it was expected that the stiffness would decrease more after SSC than after isometric fatigue (as a result of a greater alteration of the reflex sensitivity SSC), our results showed that both protocols had a similar effect on knee muscle stiffness during jumping exercises. Both fatigue protocols induced muscle fatigue, and the decrease in jump performance was linked to a decrease in the strength and stiffness of the knee extensor muscles.
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Perrey, Stéphane, Guillaume Millet, Robin Candau, and Jean-Denis Rouillon. "Stretch-Shortening Cycle in Roller Ski Skating: Effects of Speed." Journal of Applied Biomechanics 16, no. 3 (August 2000): 264–75. http://dx.doi.org/10.1123/jab.16.3.264.

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The purpose of this study was to examine the effects of speed on the stretch-shortening cycle (SSC) behavior during roller ski skating. Ten highly skilled male cross-country skiers roller skied at 4.56, 5.33 m · s–1and maximal speed using the V2-alternate technique on a flat terrain. Knee and ankle joint kinematics, and EMG of thevastus lateralis(VL) andgastrocnemius lateralis(GL) muscles were recorded during the last 40 s of each bout of roller skiing. Maximal speed was associated with increases in cycle rate combined with decreases in cycle length. For VL, no significant differences were observed for the integrated EMG eccentric-to-concentric ratio (iEMG Ecc/Conc) and for the stretching velocity over the range of speeds. For GL, stretching velocity and iEMG Ecc/Conc were significantly greater at maximal speed. The analysis of GL EMG activity suggests that speed improved GL stiffness so that more elastic energy was stored, a better force transmission occurred, and coupling time decreased. These findings suggest that the efficiency of roller ski skating locomotion may be increased with speed through a better use of the stretch-shortening cycle pattern in the ankle extensors.
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Kyröläinen, Heikki, and Paavo V. Komi. "Neuromuscular function with different stretching velocities in the stretch-shortening cycle (SSC) exercises." Journal of Biomechanics 27, no. 6 (January 1994): 704. http://dx.doi.org/10.1016/0021-9290(94)91082-0.

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Horita, T., P. Komi, I. Hämäläinen, and J. Avela. "Exhausting stretch-shortening cycle (SSC) exercise causes greater impairment in SSC performance than in pure concentric performance." European Journal of Applied Physiology 88, no. 6 (February 2003): 527–34. http://dx.doi.org/10.1007/s00421-002-0716-z.

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Gerodimos, Vassilis, Andreas Zafeiridis, Stefanos Perkos, Konstantina Dipla, Vassiliki Manou, and Spiros Kellis. "The Contribution of Stretch-Shortening Cycle and Arm-Swing to Vertical Jumping Performance in Children, Adolescents, and Adult Basketball Players." Pediatric Exercise Science 20, no. 4 (November 2008): 379–89. http://dx.doi.org/10.1123/pes.20.4.379.

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This study examined from childhood to adulthood: (1) the effects of countermovement (use of stretch-shortening cycle-SSC) and arm-swing (AS) on vertical jumping (VJ) performance and (2) the ability to use the SSC and AS during VJ. Male basketball players (n = 106) were divided according to their age into: children (12.0 ± 0.23), young adolescents (14.5 ± 0.41), old adolescents (16.9 ± 0.27), and adults (21.9 ± 0.32). Each participant executed three maximal squat jumps (SJ), countermovement jumps without arms (CMJ) and with arms (CMJA). The contribution of SSC and AS was calculated by the augmentation (difference and percent change) in performance between CMJ and SJ, and CMJA and CMJ, respectively. CMJA performance was significantly (p < .05) higher than CMJ and SJ, and CMJ was higher than SJ within all age-groups. There were no significant differences (p > .05) among children, young and old adolescents, and adults in the percent contribution of SSC and AS to VJ performance. The variability in the contribution of SSC and AS to VJ performance was about twofold higher in children vs. adults. It appears that the ability to use the SSC and AS is not affected by the maturation process in males, trained in basketball.
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Book chapters on the topic "Stretch-shortening cycle (SSC)"

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Lynch, Gordon S., David G. Harrison, Hanjoong Jo, Charles Searles, Philippe Connes, Christopher E. Kline, C. Castagna, et al. "Stretch-Shortening Cycle (SSC)." In Encyclopedia of Exercise Medicine in Health and Disease, 824. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-540-29807-6_3115.

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