Journal
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
Volume 11, Issue 1, Pages 53-63Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S1050-6411(00)00036-5
Keywords
electrical stimulation; submaximal activation; stimulation frequency; length dependence; human muscle
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The purpose of this study was to investigate the force-frequency relationships and the post-tetanic twitch potentiation as a function of joint angle (i.e. muscle length) in human skeletal muscles under isometric conditions. The dorsiflexor muscles of healthy subjects were stimulated at different ankle joint angles by means of constant frequency bursts at seven submaximal frequencies (50, 33, 25, 20, 16, 12, 8 Hz) with a duration of two seconds. Particular attention has been focused on the stability of recruitment in the range of joint angles examined. The results show that moment-frequency curves of human dorsiflexors change as a function of ankle angle: especially for the lower stimulation frequency range (8, 12, 16, 20 Hz), the normalized moment increases from dorsiflexion to plantar flexion (i.e. with increasing muscle length) resulting in a leftward shift of the normalized moment-frequency curves. Post-tetanic twitch potentiation is shown to be ankle joint dependent as well. (C) 2001 Elsevier Science Ltd. All rights reserved.
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