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MR 회전 브레이크를 이용한 하지 근력 증진용 헬스 자전거 개발
권대규(Tae-Kyu Kwon),김경(Kyung Kim),박용군(Young-Gyun Piao),허민,강승록(Seung-Rok Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, a new bicycle ergometer system using the Magneto-Rheological(MR) rotary brake was developed to improve muscular strength for the rehabilitation of hemiplegia patients to reduce uneven pedaling characteristics. The friction load of the MR rotary brake is adjusted according to muscle strength of the subjects. The characteristic of muscular strength was studied with various friction loads of MR rotary brake. The friction load was occurred with the current, applied to the MR rotary brake. Experiments was composed of several cycling trials for various friction loads. In training programs involving muscle improvement, it is necessary to confirm muscle activity and fatigue. To measure the muscle activity and fatigue, EMG signals of rectus femoris (RF), biceps femoris (BF), tensor fasciae latae (TFL), vastus lateralis (VL), vastus medialis (VAS), gastrocnemius (GAS), tibialis anterior (TA) and soleus (SOL) muscles were collected with surface electromyography and analyzed into time and frequency domain. A series of experiments were carried out with and without the engagement of this real-time control mode of MR rotary brake at different pedaling rate to find out the effect of the real-time control mode. The characteristics of the pedaling for these specific conditions were analyzed based on the variations in angular velocities of the pedal unit. The results showed that the variations in the angular velocities were decreased by 42.9% with the control mode. The asymmetry of pedaling between dominant and non-dominant leg was 19.63% in non-control mode and 1.97% in the control mode. The characteristics of electromyography(EMG) in the lower limbs were also measured. The observation showed that Integrated EMG(IEMG) reduced with the control mode. Therefore, the new bicycle system using MR brake with the real time control of mechanical resistance was found to be effective in recovering the normal pedaling pattern by reducing unbalanced pedaling characteristics caused by disparity of muscular strength between affected and unaffected leg.
권대규(Tae-Kyu Kwon),박용군(Yong-Jun Piao),김동욱(Dong-Wook Kim),황지혜(Ji-Hye Hwang),김남균(Nam-Gyun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We investigated the training effect of postural control for the elderly adults using a training system for postural control that we developed. 15 healthy elderly subjects were in the training group. 15 were as the control group. The training group participated in the training 3 times a week for 8 weeks in 1 hour sessions. To confirm the training effect, we measured relevant parameters such as the time of timed up and go test, and the sway path of center of pressure before and that after the training. The results showed that this training system could successfully improve the postural control capability of the elderly adults. Moreover, the significant improvement in the postural capability of the elderly subjects suggested that elderly subjects could benefit more from the training using the system for the improvement of the ability of postural control.