Neuromuscular fatigue after maximal stretch-shortening cycle exercise

Journal of Applied Physiology
V Strojnik, P V Komi

Abstract

To examine some possible sites of fatigue during short-lasting maximally intensive stretch-shortening cycle exercise, drop jumps on an inclined sledge apparatus were analyzed. Twelve healthy volunteers performed jumps until they were unable to maintain jumping height > 90% of their maximum. After the workout, the increases in the blood lactate concentration and serum creatine kinase activation were statistically significant (P < 0.001 and P < 0.05, respectively) but rather small in physiological terms. The major changes after the workout were as follows: the single twitch was characterized by smaller peak torque (P < 0.05) and shorter time to peak (P < 0.05) and half-relaxation time (P < 0.01). The double-twitch torque remained at the same level (P > 0.05), but with a steeper maximal slope of torque rise (P < 0.05); during 20- and 100-Hz stimulation the torque declined (both P < 0.01) and the maximal voluntary torque changed nonsignificantly but with a smaller maximal slope of torque rise (P < 0.01) and a higher activation level (P < 0.05), accompanied by an increased electromyogram amplitude. These findings indicate that the muscle response after the short-lasting consecutive maximum jumps on the sledge apparatus may involve t...Continue Reading

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Citations

Oct 23, 2002·Journal of Applied Physiology·G Y MilletY Ballay
May 12, 2005·European Journal of Applied Physiology·Craig Twist, Roger Eston
Feb 25, 2006·Journal of Applied Physiology·Markus AmannJerome A Dempsey
Sep 9, 2006·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Lee M RomerJerome A Dempsey
Aug 24, 2007·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Markus AmannJerome A Dempsey
Apr 17, 2008·European Journal of Applied Physiology·Jean Theurel, Romuald Lepers
Sep 3, 2010·Scandinavian Journal of Medicine & Science in Sports·N DecorteS Verges
May 19, 2011·European Journal of Applied Physiology·Guillaume Y MilletSamuel Vergès
Apr 4, 2012·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Katie P WaddenDavid G Behm
Apr 6, 2013·Medicine and Science in Sports and Exercise·Nicolas DecorteBernard Wuyam
Oct 14, 2014·Frontiers in Human Neuroscience·Vianney RozandRomuald Lepers
Jun 18, 2016·Frontiers in Human Neuroscience·Jérôme Nicolas SpringJérôme Barral
Jul 20, 2016·Medicine and Science in Sports and Exercise·Valentin DoguetMarc Jubeau
Nov 20, 2016·European Journal of Applied Physiology·Bruno P C SmirmaulSamuele M Marcora
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