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보행과 한발,두발 수직점프 수행 시 내측비복근 근-건 복합체와 근섬유다발의 길이 변화 패턴의 차이
이해동 ( Hae Dong Lee ),한보람 ( Bo Ram Han ),김진선 ( Jin Sun Kim ),오정훈 ( Jeong Hoon Oh ),조한엽 ( Han Yeop Cho ),윤소야 ( So Ya Yoon ) 한국운동역학회 2015 한국운동역학회지 Vol.25 No.2
Objective: The purpose of this study was to investigate difference in fascicle behavior of the medial gastrocnemius during the locomotion with varying intensities, such as gait and one-legged and two-legged vertical jumping. Methods: Six subjects (3 males and 3 females; age: 27.2±1.6 yrs., body mass: 62.8±9.8 kg, height: 169.6±8.5 cm) performed normal gait (G) at preferred speed and maximum vertical jumping with one (OJ) and two (TJ) legs. While subjects were performing the given tasks, the hip, knee and ankle joint motion and ground reaction force was monitored using a 8-infrared camera motion analysis system with two forceplates. Simultaneously, electromyography of the triceps surae muscles, and the fascicle length of the medial gastrocnemius were recorded using a real-time ultrasound imaging machine. Results: Comparing to gait, the kinematic and kinetic parameters of TJ and OJ were found to be significantly different. Along with those parameters, change in the medial gastrocnemius (MG) muscle-tendon complex (MTC) length (50.57±6.20 mm for TJ and 44.14±5.39 mm for OJ) and changes in the fascicle length of the MG (18.97±3.58 mm for TJ and 20.31±4.59 mm for OJ) were observed. Although the total excursion of the MTC and the MG fascicle length during the two types of jump were not significantly different, however the pattern of length changes were found to be different. For TJ, the fascicle length maintained isometric longer during the propulsive phase than OJ. Conclusion: One-legged and two-legged vertical jumping use different muscle-tendon interaction strategies.
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