PMID: 3769913Jan 1, 1986Paper

Positive work as a function of eccentric load in maximal leg extension movements

European Journal of Applied Physiology and Occupational Physiology
F J AvisG J van Ingen Schenau

Abstract

Negative and positive work performed during leg extension movements of 53 well trained subjects was measured with the help of a special dynamometer. The subjects performed four maximal push off trials against five different loads (25-105 kg): two two-legged extensions from a squatting position (SM) with a knee angle of 70 degrees and two trials with a preliminary counter movement (CM) but with the same extension range as in the SM. Positive work differed only by about 4% between CM and SM in spite of large differences in initial forces at the onset of concentric contraction. Based on simulations, it is suggested that in CM the advantage of stored elastic energy can almost completely be nullified by the disadvantage of a limited shortening distance of the contractile elements. It is hypothesised that elastic energy in CM can only cause considerable extra work during concentric contraction compared to the maximal positive work done in SM if the total range of lengthening and shortening of the muscle(s) involved is larger in CM than in SM.

References

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Citations

Jan 15, 2005·European Journal of Applied Physiology·Akinobu WakayamaSenshi Fukashiro
May 20, 2000·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·M H TrimbleR S Thomas
Jun 9, 1998·Annals of the New York Academy of Sciences·T J YooH Matsuoka
May 16, 2009·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Hiroshi ArakawaSenshi Fukashiro
Jun 24, 2017·Journal of Strength and Conditioning Research·Bas Van Hooren, Julia Zolotarjova
Jul 28, 2006·Journal of Applied Biomechanics·Senshi FukashiroAkinori Nagano
Nov 1, 1996·Medicine and Science in Sports and Exercise·M F BobbertA J Van Soest

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