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보행속도에 따른 지면보행과 Treadmill 보행의 비교: 운동분석 및 에너지 소모
손량희,최희석,손종상,황성재,김영호,Sohn, R.H.,Choi, H.S.,Son, J.S.,Hwang, S.J.,Kim, Y.H. 대한의용생체공학회 2009 의공학회지 Vol.30 No.3
In this study, treadmill walking and overground walking were compared at the same condition based on kinematics and energy expenditures(EE). In addition, we compared the actual energy expenditure and calculated EE by treadmill. The kinematics of treadmill and overground walking were very similar. The values at each joint were significantly different(P<0.05), but magnitude of the difference was generally less than 4$^{\circ}$. In the EE using cardiopulmonary exercise, EE of treadmill walking was significantly greater when measured on the overground. It seemed to be the increased stress during the gait by the continuous movement of the belt. As the velocity increased, there was significant difference between actual EE and calculated EE by treadmill due to EE curve increasing exponentially. Therefore the further study would be required to find the correlation of the two methods and calibrate the values from them.
황선홍,조영근,손량희,김영호,김한성,임도형,Hwang, S.H.,Cho, Y.G.,Sohn, R.H.,Kim, Y.H.,Kim, H.S.,Lim, D.H. 대한의용생체공학회 2009 의공학회지 Vol.30 No.3
The purpose of this study was to investigate the biomechanical effects of an application of whole body vibration during strengthening exercise. Every participant performed four weeks exercise program using general leg-press versus vibrating leg-press. Participants did legpress exercise three sets of 25 repetitions with the load of 25 percent of 1RM during first week, three sets of 20 repetitions with 40 percent of 1RM during second week, three sets of 15 repetitions with 60 percents of 1RM during third week, and three sets of 15 repetitions with 80 percent of 1RM during last fourth week. The vibration(25Hz, 5mm) was applied only to the vibration exercise group. A three dimensional virtual lower extremity model for one of subject and virtual leg-press model were generated. The knee extensor muscle forces were analyzed using the virtual model and the knee joint torque(maximum extension torque) was measured using an isokinetic device. Calculated muscle forces were smaller in vibrating leg-press exercise than in general leg-press exercise. An increase of the maximum knee extension joint torque was 2.14 times larger approximately after the four week vibration leg-press exercise program was performed.
전문수기마사지 동작 중 원형강찰법에 대한 동작 및 가압력 분석
김영호,유제성,손종상,황선홍,손량희,차인혁,송재훈,송성재,Kim, Y.H.,Ryu, J.S.,Son, J.S.,Hwang, S.H.,Sohn, R.H.,Cha, I.H.,Song, J.H.,Song, S.J. 대한의용생체공학회 2010 의공학회지 Vol.31 No.6
In this study, the circular friction massage technique was performed on the trapezius, the levator scapulae, and the deltoid muscles to collect the information on massage pressures and positions, and thus to utilize it in professional massage system design. Massage motion was measured with the 3-D motion capture system and finger pressures were simultaneously obtained with grip sensors. Massage motions, pressure patterns, and pressure times were different on each muscle, and the motion trajectory was similar to the ellipsoidal shape. The trapezius had higher pressure, longer massage time, and larger impulse than other muscles. These results could be useful to design a massage system based on biomechanical analysis. In order to improve massage effect, it is also strongly recommended that the tip of the system be similar with that of a human thumb in shape and material.