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European Journal of Applied Physiology

Erschienen in:

01.08.2014 | Original Article

Selective muscle contraction during plantarflexion is incompatible with maximal voluntary torque assessment

verfasst von: Nicolas A. Turpin, Antony Costes, David Villeger, Bruno Watier

Erschienen in: European Journal of Applied Physiology | Ausgabe 8/2014

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Abstract

Objective

Large variations in maximal voluntary torque are reported in the literature during isometric plantarflexion contractions. We propose that these differences, which could reach 40 % across similar studies, could be explained by differences in the instructions provided, and notably by instructions as to favoring or not multi-joint contractions.

Method

Sixteen participants were placed on an isokinetic ergometer in 3 different positions, supine, prone and seated, with the ankle in the neutral position, and instructed to create maximal force on the footplate by conforming to instructions that favored either isolated (ISOL) or multi-joint (ALL) isometric contractions. Torque, foot kinematics and the electromyographic activity of seven muscles of the lower limb have been recorded.

Results

Joint torques were greater in ALL compared to ISOL (p < 0.05) with gains of 43.5 (25.4–170.6) %, 42.5 (1.4–194.6) % and 15.3 (9.3–71.9) % in the supine, prone and seated position, respectively [values are given as median (range)]. The results of this study suggested that forces created by muscles that do not span over the ankle joint significantly influenced the measured joint torque. Nevertheless, the observed gains in torque were associated with greater plantarflexor muscles activation, showing that the ISOL condition may have induced a form of inhibition of these muscles.

Conclusions

The results of this study suggest that using isolated contractions, hence constrained testing protocols, cannot provide optimal conditions for MVC testing, notably for plantarflexor muscles, which seem to be extremely sensitive to such constrained conditions.

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Titel: Selective muscle contraction during plantarflexion is incompatible with maximal voluntary torque assessment
verfasst von: Nicolas A. Turpin
Antony Costes
David Villeger
Bruno Watier
Publikationsdatum: 01.08.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 8/2014
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-014-2900-3

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Abstract

Objective

Method

Results

Conclusions

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