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THE INFLUENCE OF BODY POSITION ON LOAD RANGE DURING ISOKINETIC
KNEE EXTENSION/FLEXION
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Brian
W. Findley1, Lee E. Brown2 ,
Michael Whitehurst3, Tedd Keating4, Daniel P.
Murray2 and Lisa M. Gardner2 |
1Palm Beach Community College, Boca Raton, FL, USA
2California State University, Fullerton, Fullerton, CA, USA
3Florida Atlantic University, Davie, FL, USA
4Manhattan College, Bronx, NY, USA
| Received |
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06 March 2006 |
| Accepted |
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09
July 2006 |
| Published |
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01
September 2006 |
©
Journal of Sports Science and Medicine (2006) 5, 400 - 406
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| ABSTRACT |
| Isokinetic range of motion (ROM) has three distinct phases: rate
of velocity development (RVD), load range (LR), and deceleration (DCC).
The purpose of this study was to determine if differences in isokinetic
knee extension/flexion LR exist between body positions. Ten subjects
(4 males and 6 females, age 29.3 ± 5.4 yrs, ht 1.71 ± 0.10 m, wt 71.9
± 12.9 kg) volunteered to participate in the seated vs. prone investigation
and nine different subjects (4 males and 5 females, age 29.5 ± 6.9
yrs, ht 1.72 ± 0.09 m, wt 69.0 ± 13.8 kg) volunteered to participate
in the seated vs. supine study. Each subject completed 3 maximal reciprocal
concentric/concentric repetitions of dominant knee extension/flexion
on a Biodex System 2 isokinetic dynamometer at 60, 120, 180, 240 and
360 deg·sec-1 in the supine or prone and seated positions. Repeated
measures ANOVA revealed that only seated flexion at 360 deg·sec-1
(57.6 ± 1.7 degrees) elicited significantly (p < 0.05) greater
LR than prone (49.2 ± 2.8 degrees). No significant differences in
LR extension or flexion existed at any velocity between the supine
vs. seated positions. ANOVA also demonstrated differences between
seated vs. prone torque, work and power at most velocities while there
was no difference between seated vs. supine. LR is the only phase
of an isokinetic repetition where quantifiable resistance is maintained
and this data appears to support that it may not be position-dependent
but position may alter traditional performance variables.
KEY
WORDS: Rate of velocity development, acceleration, deceleration.
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