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Influence of load and stretch shortening cycle on the kinematics, kinetics and muscle activation that occurs during explosive upper-body movements
Although explosive power in lower-body movements has been extensively studied, there is a paucity of research examining such movements in the upper body. This study aimed to investigate the influence of load and the stretch shortening cycle (SSC) on the kinematics, kinetics, and muscle activation that occurs during maximal effort throws. A total of 17 male subjects performed SSC and concentric only (CO) bench throws using loads of 15%, 30%, 45%, 60%, 75%, 90% and 100% of their previously determined one repetition maximum bench press. The displacement, velocity, acceleration, force and power output as well as the electromyogram (EMG) from pectoralis major, anterior deltoid, and triceps brachii were recorded for each throw. The results were compared using multivariate analysis of variance with repeated measures. A criterion alpha level of P ≤ 0.05 was used. Similar force velocity power relationships were determined for this multijoint upper-body movement as has been found for isolate muscles, single joint movements, and vertical jumping The highest power output was produced at the 30% [563 (104) W] and 45% [560 (86) W] loads during the SSC throws. Force output increased as a function of load however, even the lighter loads resulted in considerable force due to the high accelerations produced. Average velocity, average and peak force, and average and peal power output were significantly higher for the SSO throws compared to the CO throws. However, peal velocity and height thro
PMID : 9134365 ISSN : 0301-5548 CODEN : EJAPCK
European journal of applied physiology and occupational physiology A. 1997, vol. 75, n° 4, pp. 333-342 [bibl. : 29 ref.]
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