Unilateral lower limb muscle fatigue induces bilateral effects on undisturbed stance and muscle EMG activities.
J Electromyogr Kinesiol
; 20(5): 947-52, 2010 Oct.
Article
em En
| MEDLINE
| ID: mdl-19879160
ABSTRACT
The study investigated the effects of an unilateral ankle muscle fatigue onto independent postural control parameters including the trajectories of the estimated resultant CoP (CoPres) and his components the centre of gravity (CG) and CoP-CG trajectories. Nine healthy men realized series of 10 toe-lift immediately followed by 10 knee flexions until exhaustion with one (Ex) leg. Maximal isometric voluntary contractions, postural sway measures of each leg, and muscular activities of the ankle muscles were recorded before and immediately after the fatiguing exercise. As expected, the latter induced a decrease in maximal voluntary peak force associated with a greater variability of the relative contribution of each leg on the CoPres, enhanced all postural parameters of the non-exercised leg. A significant decreased of the tibialis anterior EMG activity for the Ex leg and an increased one for the NoEx leg. Finally, following unilateral fatigue, the body sway destabilisation seemed to occur only along the medio-lateral (ML) axis. The enhanced and greater variability of the variance along ML axis might be explained by the recourse at the loading-unloading strategy choice and suggests a central attempt to compensate for pain sensation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Postura
/
Músculo Esquelético
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Fadiga Muscular
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Eletromiografia
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Equilíbrio Postural
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Perna (Membro)
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Contração Muscular
Limite:
Adult
/
Humans
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Male
Idioma:
En
Revista:
J Electromyogr Kinesiol
Assunto da revista:
FISIOLOGIA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
França
País de publicação:
ENGLAND
/
ESCOCIA
/
GB
/
GREAT BRITAIN
/
INGLATERRA
/
REINO UNIDO
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SCOTLAND
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UK
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UNITED KINGDOM