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Acute leg cycling exercise attenuates the H-reflex recorded in soleus but not flexor carpi radialis
MOTL RW; DISHMAN RK
MUSCLE NERVE , 2003, vol. 28, n° 5, p. 609-613 Doc n°: 111171 Localisation : Documentation IRR Descripteurs : AC232 - ATTEINTES DES NERFS RACHIDIENS, DE62 - EXPLORATION EXAMENS BILANS - TIBIA-PERONE The amplitude of the Hoffman reflex (H-reflex) in the soleus muscle is attenuated after acute bouts of leg-cycling exercise. The attenuation has been interpreted as a "tranquilizing" effect of exercise controlled by the central nervous system and generalized beyond a single spinal segmental level. If so, the postexercise depression of the H-reflex should occur in both the soleus and the flexor carpi radialis (FCR) muscle, which is not actively involved during leg cycling. This experiment examined the effect of moderate-intensity cycling exercise on the H-reflex recorded in soleus and FCR among 16 men. The H-reflex was measured immediately before and 10 min after 30 min of either moderate-intensity leg cycling (60% VO(2peak)) or quiet rest. The acute bout of cycling exercise reduced the H-reflex in the soleus but not in the FCR. Thus, the attenuation of the H-reflex after leg cycling does not generalize beyond the spinal segmental level that modulates the involved locomotory muscles ; it is likely the result of segmental processes associated with the repetitive stretching or activation of the soleus muscle Langue : ANGLAIS Tiré à part : OUI Identifiant basis : 2004229239 |
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