체간 관절 가동 범위에 있어서 중력보정에 의한 등속성 근력과근력 비율의 교차 확인
Identification of Cross-Over in Isokinetic Muscle Strength and PT Ratio by Gravity Correction in Trunk Joint’s ROM
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PURPOSE: The aim of this research was to examine the effect of gravity correction and investigate the relationships between trunk flexibility and isokinetic strength of trunk. METHODS: To obtain peak torque (PT) used as muscle strength and power index, 41 young men without any orthopedic diseases performed isokinetic exercise using HUMAC NORM trunk extension flexion (TEF) modular at 60 °/sec, 5 times. Trunk flexibility was measured by trunk forward flexion, sit and reach, and back extension test. RESULTS: During flexion from -15° to 0°, non-gravity corrected (NGC) PT was significantly (p<.05) lower (4.69%) than gravity corrected (GC) PT. Contrastively, NGC PT was significantly (p<.05) higher (2.52%) than GC PT during extension. Furthermore NGC PT ratio was significantly (p<.05) lower than GC PT ratio. During flexion 0°to 45°, NGC PT was significantly (p<.05) higher (27.49%) than GC PT. Contrastively, NGC PT was significantly (p<.05) lower (15.06%) than GC PT during extension. Furthermore NGC PT ratio was significantly (p<.05) lower than GC PT ratio. Moreover, only back extension of trunk flexibility was correlated with PT ratio on -15° to 0° regardless of gravity correction. CONCLUSIONS: Owing to gravity correction, it is important to diverge the range of motion when measure isokinetic trunk muscle strength.
Abstract
PURPOSE: The aim of this research was to examine the effect of gravity correction and investigate the relationships between trunk flexibility and isokinetic strength of trunk. METHODS: To obtain peak torque (PT) used as muscle strength and power index, 41 young men without any orthopedic diseases performed isokinetic exercise using HUMAC NORM trunk extension flexion (TEF) modular at 60 °/sec, 5 times. Trunk flexibility was measured by trunk forward flexion, sit and reach, and back extension test. RESULTS: During flexion from -15° to 0°, non-gravity corrected (NGC) PT was significantly (p<.05) lower (4.69%) than gravity corrected (GC) PT. Contrastively, NGC PT was significantly (p<.05) higher (2.52%) than GC PT during extension. Furthermore NGC PT ratio was significantly (p<.05) lower than GC PT ratio. During flexion 0°to 45°, NGC PT was significantly (p<.05) higher (27.49%) than GC PT. Contrastively, NGC PT was significantly (p<.05) lower (15.06%) than GC PT during extension. Furthermore NGC PT ratio was significantly (p<.05) lower than GC PT ratio. Moreover, only back extension of trunk flexibility was correlated with PT ratio on -15° to 0° regardless of gravity correction. CONCLUSIONS: Owing to gravity correction, it is important to diverge the range of motion when measure isokinetic trunk muscle strength.
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