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http://dx.doi.org/10.5103/KJSB.2014.24.2.173

Effects of Combined Exercise on Injury Risk Factors of Lower Extremity during Landing  

Ha, Sung-He (Department of Physical Education, Graduate School of Korea National Sport University)
Yoo, Si-Hyun (Department of Physical Education, Graduate School of Korea National Sport University)
Kim, Joo-Nyeon (Department of Physical Education, Graduate School of Korea National Sport University)
Gil, Ho-Jong (Department of Physical Education, Graduate School of Korea National Sport University)
Ryu, Ji-Seon (Department of Health and Exercise Science, College of Lifetime Sport of Korea National Sport University)
Yoon, Suk-Hoon (Department of Community Sport, College of Lifetime Sport of Korea National Sport University)
Park, Sang-Kyoon (Department of Physical Education, College of Sport Science of Korea National Sport University)
Publication Information
Korean Journal of Applied Biomechanics / v.24, no.2, 2014 , pp. 173-180 More about this Journal
Abstract
The purpose of this study was to investigate the effect of combined exercise on injury risk factors of lower extremity during landing. Ten sports talented athletes participated in this study. Sports talented athletes participated in a combined exercise (sports talented exercise, coordination) for 16 weeks. A three-dimensional motion analysis was performed using eight infrared cameras (sampling rate of 100 Hz), one force plate, and electromyography system (sampling rate of 1000 Hz) during landing. Kinetic, and kinematics analysis including average impulsive force, angle of lower extremity, vertical stiffness, onset of muscle activation were calculated by Matlab2009a software. Paired t-test was performed at alpha=.05. The average impulsive force in landing phase was not statistically significant (t=-.748, p=.474). The hip joint angle was more decreased in post test compared to pre test (E1: t=2.682, p=.025, E2: t=5.609, p=.000, E3: t=2.538, p=.032). The knee joint (E1: t=-.343, p=.739, E2: t=1.319, p=.220, E3: t=.589, p=.570) and ankle joint (E1: t=.081, p=.937, E2: t=.784, p=.453, E3: t=.392, p=.704) angle were tended to decrease after combined exercise. The vertical stiffness was tended to decrease after combined exercise (t=1.972, p=.080). Onset of quadriceps femoris (t=.698, p=.503) and medial gastocnemius (t=1.858, p=.096) were tended to be faster than biceps femoris (t=-.333, p=.747) after combined exercise. Although thses findings were not statistically significant except on a hip joint angle, risk factors of lower extremity such as joint angle, vertical stiffness and onset of quadriceps femoris, medial gastrocnemius were positively changed after the combined exercise but an additional training for improved onset of biceps femoris would be required in the future.
Keywords
Risk Factor of Lower Extremity; Combined Exercise; Landing;
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Times Cited By KSCI : 2  (Citation Analysis)
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