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Effect of ankle position fixation on peak torque and electromyographic activity of the knee flexors and extensors
CROCE R; MILLER JP; ST PIERRE P
ELECTROMYOGR CLIN NEUROPHYSIOL , 2000, vol. 40, n° 6, p. 365-373 Doc n°: 96954 Localisation : Documentation IRR Descripteurs : AK2 - EMG , DE72 - EXPLORATION EXAMENS BILANS - CHEVILLE The purpose of this study was to examine the effect of ankle position fixation on peak torque (PT) and electromyographic (EMG) activity of knee-joint muscles during isokinetic testing. Twelve female athletes performed isokinetic knee flexion and extension at 60°and 180°/s under two conditions: with the ankle fixed in a position of plantarflexion and with the ankle fixed in a position of dorsiflexion. Bipolar surface electrodes were placed on the vastus lateralis, vastus medialis, biceps femoris, medial hamstrings, and the lateral head of the gastrocnemius for determination of the root mean square of the EMG (rmsEMG) and the median frequency of the EMG (mfEMG). No significant differences in knee extensor PT were noted in either ankle position for each velocity tested. Significant differences were noted, however, in knee flexor PT (p < 0.05) at both 60°and 180°/s, with the greatest PT observed with the ankle fixed in dorsiflexion. Neither quadriceps, hamstrings, nor gastrocnemius rmsEMG activity was affected by ankle position; however, there was a significant difference in mfEMG for the gastrocnemius, with higher frequencies observed with the ankle fixed in plantarflexion Langue : ANGLAIS Tiré à part : OUI Identifiant basis : 2000212877 |
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