Neuromuscular fatigue of the knee extensors during repeated maximal intensity intermittent-sprints on a cycle ergometer.
Muscle Nerve
; 51(4): 569-79, 2015 Apr.
Article
em En
| MEDLINE
| ID: mdl-25043506
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.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Ciclismo
/
Fadiga Muscular
/
Joelho
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Contração Muscular
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article