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ANALYSIS OF ISOKINETIC KNEE EXTENSION / FLEXION IN MALE ELITE ADOLESCENT
WRESTLERS
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Sanli
Sadi Kurdak1 ,
Kerem Özgünen1, Ümüt Adas1, Cigdem Zeren1,
Banu Aslangiray2, Zübeyde Yazýcý2 and Selcen
Korkmaz2 |
1University of Cukurova, Faculty of Medicine, Department of Physiology
and 2Department of Physical Education and Sports College, Adana, Turkey
| Received |
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05 July 2005 |
| Accepted |
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20
September 2005 |
| Published |
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01
December 2005 |
©
Journal of Sports Science and Medicine (2005) 4, 489
- 498
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| ABSTRACT |
| Wrestling
requires strength of the upper and lower body musculature which is
critical for the athletic performance. Evaluation of the adolescent's
skeletal muscle is important to understand body movement, especially
including those involved in sports. Strength, power and endurance
capacity are defined as parameters of skeletal muscle biomechanical
properties. The isokinetic dynamometer is an important toll for making
this type of evaluation. However, load range phase of range of motion
has to be considered to interpret the data correctly. With this in
mind we aimed to investigate the lover body musculature contractile
characteristics of adolescent wrestlers together with detailed analyses
of load range phase of motion. Thirteen boys aged 12 - 14 years participated
to this study. Concentric load range torque, work and power of knee
extension and flexion were measured by a Cybex Norm dynamometer at
angular velocities from 450°/sec to 30°/sec with 30°/sec decrements
for each set. None of the wrestlers were able to attain load range
for angular velocities above 390°/sec and 420°/sec for extension and
flexion respectively. Detailed analyses of the load range resulted
in statistically significant differences in the normalized load range
peak torque for extension at 270°/sec (1.44 ± 0.28 Nm·kg-1
and 1.14 ± 0.28 Nm·kg-1 for total and load range peak torque
respectively, p < 0.05), and for flexion at 300°/sec (1.26 ± 0.28
Nm·kg-1 and 1.03 ± 0.23 Nm·kg-1 for total and
load range peak torque respectively, p < 0.05), compared to total
peak torque data. Similarly, the significant difference was found
for the work values at 90°/sec (1.91 ± 0.23 Nm·kg-1 and
1.59 ± 0.24 Nm·kg-1 for total and load range work respectively
for extension and 1.73 ± 0.21 Nm·kg-1 and 1.49 ± 0.19 Nm·kg-1
for total and load range work respectively for flexion, p < 0.05),
and was evident at higher angular velocities (p < 0.001) for both
extension and flexion. At extension, load range power values were
significantly smaller than total power for all angular velocities
except 150°/sec (p < 0.05 for 120 and 180°/sec, p < 0.001 for
others). Finally, load range flexion power was found to be higher
than total power with statistically significance (p < 0.05 for
60, 120, 150, 180, 210, 270 and 300°/sec, p < 0.001 for 240 °/sec).
Extra caution is required for correct interpretation of load range
data in terms of considering the load range during limb movement.
Evaluation of muscle performance of these adolescent wrestlers at
regular intervals may give us an opportunity to obtain a healthy maturation
profile of these adolescent wrestlers.
KEY
WORDS: Wrestling, adolescent, isokinetic dynamometer, muscle,
load range.
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