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KMID : 1195020180140010103
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Archives of Orthopedic and Sports Physical Therapy
2018 Volume.14 No. 1 p.103 ~ p.108
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Comparison of H：Q Ratios According to Flexion Angle and Angular Velocity of Hip Joint in Isokinetic Muscular Strength of Knee Joint
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Bae Won-Sik
Lee Keon-Cheol
Kim Hyeon-Su
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Abstract
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The purpose of this study was to demonstrat that the change of functional ratios for isokinetic hamstring : quadriceps strength by flexion angle and angular velocity change in hip joint. The subjects for this study were composed of 30 people who had no medical history of the lower extremity such as surgery of knee and ankle. For each hip position (50°, 70°, 90° of flexion), participants used the dominant leg to perform (1)3 maximal concentric knee flexion-extension at 60° per second, (2)3 maximal eccentric knee flexion-extension 60° per second. (3)3 maximal concentric knee flexion-extension at 180° per second and (4)3 maximal eccentric knee flexion-extension 180° per second. The results of this study, the flexion angle of the hip joints affected the ratio of the hamstring and quadriceps, and the ratio increased as the hip flexion angle increased. In addition, the increase in functional H:Q ratio showed a larger ratio, and the eccentric contraction of the hamstring was higher than the concentric contraction. Therefore, when measuring and exercising with regard to the stability of the knee joint and ligament injuries using isokinetic equipment, the bending angle of the hip joint is 90° and the angular velocity is 180°/s.
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KEYWORD
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Hip flexion angle, Angular velocity, H/Q functional ratio, H/Q conventional ratio
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