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Articles in PresS, published online ahead of print November 15, 2002
J Appl Physiol, 10.1152/jap.00717.2002
Submitted on August 5, 2002
Accepted on November 13, 2002
1 INSERM/ERIT-M 0207 Motricite-Plasticite, UFR STAPS, Universite de Bourgogne, Dijon, France
2 INSERM/ERIT-M 0207 Motricite-Plasticite, UFR STAPS, Universite de Bourgogne, Dijon, France; Laboratoire de Biomecanique et de physiologie, Institut National des Sports et de l'Education Physique(INSEP), Paris, France
* To whom correspondence should be addressed. E-mail: nicolas.babault{at}u-bourgogne.fr.
The effect of muscle length on neural drive (here termed 'neural activation') was investigated from EMG activities and activation levels (twitch interpolation). The neural activation was measured in nine males during isometric and concentric (30 and 120°.s-1) knee extensions for three muscle lengths (35, 55 and 75°knee flexion, i.e., shortened, intermediate and lengthened muscles, respectively). Long (76°), medium (56°) and short ranges of motion (36°) were used to investigate the effect of the duration of concentric contraction. Neural activation was found to depend on muscle length. Reducing the duration of contraction had no effect. Neural activation was higher with short muscle length during isometric contractions and was weaker for shortened than for intermediate and lengthened muscles performing 120°.s-1 concentric contractions. Muscle length had no effect on 30°.s-1 concentric neural activation. Peripheral mechanisms and discharge properties of the motoneurons could partly explain the observed differences in the muscle length effect. We thus conclude that muscle length has a predominant effect on neural activation that would modulate the angular velocity dependency.
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