Article

Formulating the hypothesis that a maximal running exercise could induce fatigue
of some foot muscles, we searched for electromyographic (EMG) signs of fatigue in
the tibialis anterior (TA), peroneus longus (PL), and gastrocnemius medialis (GM)
muscles. We also searched for post-exercise alterations of the stationary upright
standing in normal-arched feet subjects. Healthy subjects performed a maximal
running exercise. Surface EMGs of the TA, PL, and GM muscles were analysed during
maximal dynamic efforts. Before and after the running bout, we measured the
evoked compound muscle potential (M-wave) in TA, the maximal force into inversion
(MIF), and the repartition of the plantar and barycentre surfaces with a
computerised stationary platform. During maximal running exercise, the median
frequency of the EMG spectra declined in TA while it remained stable in the PL
and GM muscles. After the exercise, MIF decreased, and both the rearfoot plantar
surface and the barycentre surface increased. We concluded that a maximal running
bout elicits EMG signs of fatigue, though only in the TA muscle. It also elicits
post-exercise changes in the foot position during stationary upright standing
which indicates a foot eversion. These data solely concern a maximal running test
and they can not be extrapolated to walking or running at a low speed.
CI - Copyright (c) 2012 Elsevier B.V. All rights reserved.

Langue : ANGLAIS