The effects of voluntary contraction intensity and gender on perceived exertion during isokinetic quadriceps exercise |
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| Authors: | Danny M Pincivero Alan J Coelho Robert M Campy Yuliya Salfetnikov Ashley Bright |
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| Institution: | (1) Human Performance and Fatigue Laboratory, Department of Physical Therapy, Eastern Washington University, 526 5th Street, Mail Stop 4, Cheney, WA 99004 USA e-mail: dpincivero@mail.ewu.edu Tel.: +1-509-6234323; Fax: +1-509-6234321, US;(2) Department of Physical Education, Health and Recreation, Eastern Washington University, Cheney, WA 99004, USA, US |
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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. The 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. Each subject completed
five maximal isokinetic, concentric quadriceps contractions in a seated position at 60° · s−1 to determine their single, highest peak torque. All subjects then completed, in a random order, 3–5 submaximal isokinetic
contractions at 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90% of their single, highest peak torque. Each relative contraction
level (i.e., percentage) was achieved by having the subjects attempt to match the peak of their torque curve to a horizontal
line on a computer monitor. Perceived exertion was measured by asking the subjects to provide a number that corresponded to
the feelings in their quadriceps during exercise by viewing a modified category-ratio (CR-10) scale. The results of a two-factor
(gender × intensity) analysis of variance revealed a significant, intensity main effect (F
8,232=92.19, P < 0.001, η2=0.77, 1–β=0.99) and no significant gender main effect (F
8,232=2.66, P = 0.11, η2=0.09, 1–β=0.35) or interactions (F
8,232 = 1.01, P=0.43, η2=0.04, 1–β=0.46). The findings of this study demonstrate that perceived exertion is significantly (P < 0.05) different from the specific target values on the CR-10 scale at 10%, and 50–90% maximum voluntary contraction. The
results revealed that the increase in perceived exertion across the contraction intensities could be fit to both linear (F
1,29=205.41, P < 0.001, η2=0.88, 1–β=0.99) and quadratic (F
1,29=10.05, P=0.004, η2=0.26, 1–β=0.87) trends. These findings suggest that perceived exertion is underestimated during submaximal isokinetic exercise,
and is not different between males and females.
Accepted: 18 October 2000 |
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| Keywords: | Quadriceps RPE Isokinetic Gender Strength |
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