Conflicting Effects of Fatigue and Potentiation on Voluntary Force

• Autores: David G. Behm, Duane C. Button, Glen Barbour, Jeremy C. Butt, Warren B. Young
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 18, Nº. 2, 2004, págs. 365-372
• Idioma: inglés
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• Resumen

  • The objective of this study was to investigate whether a warmup consisting of a series of maximal contractions would augment the force and activation of subsequent leg extensor contractions.

    Both voluntary and evoked isometric contractions were tested to determine the mechanisms underlying the response. Nine subjects were tested for twitch, tetanic, submaximal (30%), and maximal voluntary contractile (MVC) properties before and after (1, 5, 10, and 15 minutes) one to three 10-second MVCs. MVC force either did not change following 1�2 MVCs or was depressed at 10 and 15 minutes after 3 MVCs. MVC activation was decreased (4.4�6.9%) throughout recovery, whereas submaximal contractions were minimally affected. Although overall, twitches were potentiated (15.5�19.8%) posttest, 3 MVCs had significantly greater twitch potentiation than 1 or 2 MVCs at 5 and 10 minutes. Results suggest that voluntary and evoked contractions respond differently to prior 10-second MVCs. In the present study, a warm-up routine of 1�3 MVCs of a 10-second duration did not enhance subsequent voluntary performance.