By American College of Sports Medicine, Nicholas Ratamess Jr. PhD CSCS*D FNSCA
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Additional info for ACSM's Foundations of Strength Training and Conditioning
Although peak ISOM torque may vary slightly amongst different joint actions, singlejoint movements are depicted as ascending-descending torque curves (27). The strength, or force, curves for multiple-joint actions differ. 9. Ascending-descending strength (torque) curve. The values depict areas of maximal strength determined by several studies. (Redrawn from Kraemer WJ, Fry AC, Ratamess NA, French DN. Strength testing: development and evaluation of methodology. In: Maud PJ, Foster C, eds. Physiological Assessments of Human Performance.
The SSC is most prominent in fast-twitch (FT) muscle fibers (as FT fiber motion is faster resulting in greater elastic energy storage) and is highly trainable via plyometric, sprint, agility, and resistance training (RT). Critical to SSC performance is that the CON action follows right away. Any pause between the ECC and CON phases (or initiating an action without a countermovement) results in attenuated performance. In skeletal muscle, stored elastic energy can be lost as heat energy. Although elastic energy enhances performance, heat energy provides very little to no ergogenic effects.
Certification is a critical component to becoming a competent strength and conditioning professional. TF References 1. American College of Sports Medicine. Position Stand: the recommended quantity and quality of exercise for developing and maintaining cardiorespiratory and muscular fitness, and flexibility in healthy adults. Med Sci Sports Exerc. 1998;30: 975–991. 2. American College of Sports Medicine. Progression models in resistance training for healthy adults. Med Sci Sports Exerc. 2002;34: 364–380.