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Perceived exertion and maximal quadriceps femoris muscle strength during dynamic knee extension exercise in young adult males and females

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Abstract

The objectives of the present study were to: (1) examine perceived exertion across different target voluntary-contraction intensities; (2) compare perceived exertion ratings with actual target intensities, and (3) compare perceived exertion ratings between males and females. Subjects for this study included 30 healthy, college-aged male (n=15) and female (n=15) volunteers. All subjects were free of orthopedic, cardiopulmonary, systemic and neurological disease. Subjects were evaluated for their one-repetition maximum (1-RM) during inertial knee extension exercise. All subjects then completed, in a random order, two sub-maximal inertial contractions at 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90% of their 1-RM. Perceived exertion was measured by asking subjects to provide a number that corresponded to the feelings in their quadriceps after completion of the two repetitions, by viewing a modified category-ratio (CR-10) scale. The results showed that males lifted a significantly greater absolute (P<0.05) and relative (P<0.05) amount of mass than females; allometric-modeled strength values also demonstrated significant sex differences. The results revealed a significant intensity main effect (P<0.001) but no significant gender main effect (P=0.97) nor intensity-by-gender interactions (P=0.50) for the perceived exertion responses. The findings demonstrated that perceived exertion was significantly (P<0.05) lower than the specific expected values on the CR-10 scale from 10% to 60% of 1-RM, but was not different from 70% to 90% 1-RM. The results revealed that the increase in perceived exertion was fit to both linear and quadratic trends, and that the exponent of the power function was found to be 1.437 (SD 0.22) for the males, and 1.497 (0.295) for the females. The major findings demonstrate that although males were able to lift more absolute and relative mass than females, the perceptual response to relative load was similar between genders. The increase in perceived exertion, as a function of relative load, showed a strong linear trend; however, enhanced perceptual sensitivity at high contraction intensities was evident from the positively accelerating power function.

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Acknowledgement

This work was funded through a 2000 Faculty Research Grant at Eastern Washington University awarded by the Office of Grants and Research Development.

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Authors and Affiliations

  1. Human Performance and Fatigue Laboratory, Department of Kinesiology, The University of Toledo, Mail Stop 201, Toledo, OH 43606, USA

    Danny M. Pincivero

  2. Department of Physical Education, Health and Recreation, Eastern Washington University, Cheney, Washington, USA

    Alan J. Coelho & Robert M. Campy

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  1. Danny M. Pincivero
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  2. Alan J. Coelho
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  3. Robert M. Campy
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Correspondence to Danny M. Pincivero.

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Pincivero, D.M., Coelho, A.J. & Campy, R.M. Perceived exertion and maximal quadriceps femoris muscle strength during dynamic knee extension exercise in young adult males and females. Eur J Appl Physiol 89, 150–156 (2003). https://doi.org/10.1007/s00421-002-0768-0

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