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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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THE LOWER EXTREMITY BIOMECHANICS OF SINGLE- AND DOUBLE-LEG STOP-JUMP TASKS |
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Li-I Wang  |
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Department of Physical Education and Kinesiology, National Dong Hwa University, Taiwan (R.O.C.) |
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© Journal of Sports Science and Medicine (2011) 10, 151 - 156 |
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| ABSTRACT | |||
| The anterior cruciate ligament (ACL) injury is a common occurrence
in sports requiring stop-jump tasks. Single- and double-leg stop-jump techniques
are frequently executed in sports. The higher risk of ACL injury in single-leg
drop landing task compared to a double-leg drop landing task has been identified.
However the injury bias between single- and double-leg landing techniques
has not been investigated for stop-jump tasks. The purpose of this study
was to determine the differences between single- and double-leg stop-jump
tasks in knee kinetics that were influenced by the lower extremity kinematics
during the landing phase. Ground reaction force, lower extremity kinematics,
and knee kinetics data during the landing phase were obtained from 10 subjects
performing single- and double-leg stop-jump tasks, using motion-capture
system and force palates. Greater peak posterior and vertical ground reaction
forces, and peak proximal tibia anterior and lateral shear forces (p <
0.05) during landing phase were observed of single-leg stop-jump. Single-leg
stop-jump exhibited smaller hip and knee flexion angle, and knee flexion
angular velocity at initial foot contact with the ground (p < 0.05).
We found smaller peak hip and knee flexion angles (p < 0.05) during the
landing phase of single-leg stop-jump. These results indicate that single-leg
landing may have higher ACL injury risk than double-leg landing in stop-jump
tasks that may be influenced by the lower extremity kinematics during the
landing phase.
Key words: Anterior cruciate ligament, kinematics, kinetics, ground reaction force. |
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