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Neuromuscular fatigue of the knee extensors during repeated maximal intensity intermittent‐sprints on a cycle ergometer
Author(s) -
Pearcey Gregory E.P.,
Murphy Justin R.,
Behm David G.,
Hay Dean C.,
Power Kevin E.,
Button Duane C.
Publication year - 2015
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24342
Subject(s) - sprint , medicine , physical medicine and rehabilitation , muscle fatigue , physical therapy , cardiology , electromyography
: 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