Concentric force enhancement during human movement

Acta Physiologica Scandinavica
Taija FinniP V Komi

Abstract

In order to understand the possible mechanisms contributing to enhanced concentric performance in stretch-shortening cycle exercises in vivo the present study examined knee extension torque, electromyogram (EMG) activity and fascicle length of the vastus lateralis muscle in maximal and submaximal human movements. Maximal concentric knee extensions (120 degrees s(-1)) were done after pre-stretch and pre-isometric conditions by nine volunteers. During shortening at the knee angle of 115 degrees (180 degrees = extended) the knee extension torque was found to be greater in pre-stretch condition (272 vs. 248 N m, P < 0.05) although the torque level prior to shortening was smaller than in pre-isometric condition (268 vs. 314 N m, P < 0.05). At the moment of torque enhancement the EMG activity levels or fascicle lengths did not differ between the conditions. It is proposed that besides specific experimental conditions the present enhancement may be related to longer fascicle length prior to shortening (by 4.1 cm, P < 0.05) in pre-stretch condition and to modified length-tension properties. Fascicle length behaviour was found to play an important role also in unilateral, submaximal sledge-jump conditions where pre-loading was altered b...Continue Reading

References

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Citations

May 29, 2007·European Journal of Applied Physiology·Grant O McCaulleyJeffrey M McBride
Feb 2, 2012·European Journal of Applied Physiology·Jeffrey M McBride, James G Snyder
Dec 7, 2010·Journal of Strength and Conditioning Research·Jeffrey M McBrideTyler J Kirby
Jun 5, 2013·Journal of Science and Medicine in Sport·John A SampsonHerbert Groeller
Jun 26, 2003·Acta Physiologica Scandinavica·M IshikawaP V Komi
Apr 29, 2006·Scandinavian Journal of Medicine & Science in Sports·T Finni
Oct 14, 2006·Muscle & Nerve·Anthony J BlazevichShi Zhou
May 10, 2015·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Wolfgang SeiberlDaniel Hahn
Jul 21, 2010·Journal of Biomechanics·A KramerM Gruber
Mar 8, 2014·Journal of Applied Biomechanics·D Clark Dickin, Jacqueline E Heath
May 3, 2014·Journal of Strength and Conditioning Research·Mark M JarvisPaul Comfort
Nov 16, 2018·Journal of Human Kinetics·Wei-Hsun TaiHsien-Te Peng
Nov 24, 2018·Scandinavian Journal of Medicine & Science in Sports·Minas A MinaAnthony D Kay
Jun 7, 2019·The Journal of Experimental Biology·Atsuki Fukutani, Walter Herzog
Jul 7, 2019·The Journal of Experimental Biology·Atsuki FukutaniWalter Herzog
Jun 24, 2017·Journal of Strength and Conditioning Research·Bas Van Hooren, Julia Zolotarjova
Dec 5, 2019·Scientific Reports·Atsuki Fukutani, Tadao Isaka
May 13, 2003·Journal of Applied Physiology·Neil D Reeves, Marco V Narici
Mar 26, 2005·Journal of Applied Physiology·Timothy A Butterfield, Walter Herzog
Jan 4, 2017·European Journal of Applied Physiology·Hugo HauraixAntoine Nordez
Dec 19, 2019·Frontiers in Physiology·Jeam Marcel GeremiaMarco Aurélio Vaz
Oct 2, 2019·Frontiers in Physiology·Kanae SanoMasaki Ishikawa
Nov 30, 2020·Journal of Biomechanics·Atsuki Fukutani, Walter Herzog
Apr 6, 2021·Frontiers in Physiology·Janice WaldvogelMarco Narici
Mar 10, 2005·The Journal of Experimental Biology·Chet T Moritz, Claire T Farley

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