Neuromuscular fatigue of the knee extensors during repeated maximal intensity intermittent‐sprints on a cycle ergometer. Issue 4 (11th February 2015)

• Record Type: Journal Article
• Authors: Pearcey, Gregory E.P.; Murphy, Justin R.; Behm, David G.; Hay, Dean C.; Power, Kevin E.; Button, Duane C.
• Is Part Of: Muscle & nerve. Volume 51:Issue 4(2015:Apr.)
• Page Start: 569
• Page End: 579
• Publication Date: 2015-02-11
• Subjects: cycling -- force -- intermittent sprints -- neuromuscular fatigue -- voluntary activation; Neuromuscular diseases -- Periodicals; Muscles -- Periodicals; Nerves -- Periodicals; 616.74
• DOI: 10.1002/mus.24342
• Languages: English
• ISSNs: 0148-639X

Abstract

ABSTRACT: Introduction : We studied the time course of neuromuscular fatigue during maximal intensity intermittent‐sprint cycling. Methods : Eight participants completed 10, 10‐s sprints interspersed with 180 s of recovery. The power outputs were recorded for each sprint. Knee extensor maximum voluntary contraction (MVC) force, voluntary activation, and evoked contractile properties were recorded presprint, postsprint 5, and postsprint 10. Results : Total work over the 10 sprints decreased significantly ( P < 0.05) and could be described by 2 linear relationships from sprints 1–5 compared with sprints 6–10. Participants had significantly ( P < 0.05) lower MVC and twitch forces postsprint 5 compared with presprint. MVC, voluntary activation, and twitch force were decreased ( P < 0.05) postsprint 10 compared with postsprint 5. Conclusions : The maximal intermittent sprints induced neuromuscular fatigue. Neuromuscular fatigue in the first 5 sprints was mainly peripheral, whereas in the last 5 sprints it was both peripheral and central. Muscle Nerve 51: 569–579, 2015