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J Appl Physiol 81: 2267-2273, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology
Vol. 81, No. 5, pp. 2267-2273, November 1996
EXERCISE AND MUSCLE

Muscle inactivation: assessment of interpolated twitch technique

D. G. Behm, D. M. M. St-Pierre, and D. Perez

School of Physical and Occupational Therapy, McGill University, Montreal, Quebec H3G 1Y5, Canada

Received 29 September 1995; accepted in final form 31 May 1996.

Behm, D. G., D. M. M. St-Pierre, and D. Perez. Muscle inactivation: assessment of interpolated twitch technique. J. Appl. Physiol. 81(5): 2267-2273, 1996.---The validity, reliability, and protocol for the interpolated twitch technique (ITT) were investigated with isometric plantar flexor and leg extension contractions. Estimates of muscle inactivation were attempted by comparing a variety of superimposed with potentiated evoked torques with submaximal and maximal voluntary contraction (MVC) torques or forces. The use of nerve and surface stimulation to elicit ITT was reliable, except for problems in maintaining maximal stimulation with nerve stimulation at 20° plantar flexion and during leg extension. The interpolated twitch ratio-force relationship was best described by a shallow hyperbolic curve resulting in insignificant MVC prediction errors with second-order polynomials (1.1-6.9%). The prediction error under 40% MVC was approximately double that over 60% MVC, contributing to poor estimations of MVC in non-weight-bearing postimmobilized ankle fracture patients. There was no significant difference in the ITT sensitivity when twitches, doublets, or quintuplets were used. The ITT was valid and reliable when high-intensity contractions were analyzed with a second-order polynomial.

electrical stimulation; muscle activation

0161-7567/96 $5.00 Copyright © 1996 the American Physiological Society




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