Alteration of neuromuscular function in squash

Détails

ID Serval
serval:BIB_F648846495AD
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Alteration of neuromuscular function in squash
Périodique
Journal of Science and Medicine In Sport / Sports Medicine Australia
Auteur⸱e⸱s
Girard O., Micallef J.P., Noual J., Millet G.P.
ISSN
1878-1861[electronic]
Statut éditorial
Publié
Date de publication
2010
Volume
13
Numéro
1
Pages
172-177
Langue
anglais
Résumé
The alteration in neuromuscular function of knee extensor muscles was characterised after a squash match in 10 trained players. Maximal voluntary contraction (MVC) and surface EMG activity of vastus lateralis (VL) and vastus medialis (VM) muscles were measured before and immediately after a 1-h squash match. M-wave and twitch contractile properties were analysed following single stimuli. MVC declined (280.5+/-46.8 vs. 233.6+/-35.4 Nm, -16%; P<0.001) after the exercise and this was accompanied by an impairment of central activation, as attested by decline in voluntary activation (76.7+/-10.4 vs. 71.3+/-9.6%, -7%; P<0.05) and raw EMG activity of the two vastii (-17%; P<0.05), whereas RMS/M decrease was lesser (VL: -5%; NS and VM: -12%; P=0.10). In the fatigued state, no significant changes in M-wave amplitude (VL: -9%; VM: -5%) or duration were observed. Following exercise, the single twitch was characterised by lower peak torque (-20%; P<0.001) as well as shorter half-relaxation time (-13%; P<0.001) and reduced maximal rate of twitch tension development (-23%; P<0.001) and relaxation (-17%; P<0.05). A 1-h squash match play caused peripheral fatigue by impairing excitation-contraction coupling, whereas sarcolemmal excitability seems well preserved. Our results also emphasise the role of central activation failure as a possible mechanism contributing to the torque loss observed in knee extensors. Physical conditioners should consider these effects when defining their training programs for squash players.
Mots-clé
Adult, Electromyography, Exercise Test, Humans, Knee Joint/physiology, Male, Muscle Contraction/physiology, Muscle Fatigue/physiology, Muscle, Skeletal/physiopathology, Neuromuscular Junction/physiopathology, Racquet Sports/physiology, Tremor/physiopathology, Young Adult
Pubmed
Création de la notice
12/11/2008 14:51
Dernière modification de la notice
20/08/2019 17:22
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