Median frequency can be regarded as a valid indicator of local muscle fatigue. As local muscle fatigue develops, the muscle fiber conduction velocity decreases, the fast twitch fibers are recruited less, and consequently the median frequency shifts toward the lower frequency area. The aim of this study was to test the characteristics of the median frequency according to exercise load (30% and 60% of MVC on the biceps brachii, 40% and 80% of MVC on the vastus lateralis) during the fatiguing isometric exercise. Thirteen healthy male volunteer students of Yonsei University were recruited. After the testing maximal voluntary isometric contraction, three variables (initial median frequency, regression slope, fatigue index) from the regression line of MDF data were measured in each exercise load. The results showed that the regression slope and fatigue index were significantly different for the biceps brachii, but not for the vastus lateralis initial MDF was not significant difference according to the exercise load on both muscles. The regression slope and fatigue index could monitor physiologic muscle change during fatiguing isometric exercise. The results showed that two MDF variables reflect the local muscle fatigue according to the exercise load.

지리산국립공원 동부지구의 주요 등산로를 대상으로 운동부하 보행속도 휴식시간 비율을 조사한 결과 순수 보행시간 중 운동부하는 거림-세석평전구간이 92,4% 이며 장터목-천왕봉구간이 91.3%로 조사되었다 또한 중산리-장터목구간이 86.9% 세석평전-장터목구간이 85.3%로 조사되었다 보행속도는 장터목-천왕봉 구간이 3.97km/hr 세석평전-장터목구간이 3.06km/hr 로 조사되었으며 거림-세석평전구간은 2.23km/hr 중산리-장터목구간은 2.02km/hr,조사되었다 전체등산시간중 휴식시간의 비율은 거림-세석평전구간이 26.0%이며 중산리-장터목구간이 22.6%로 조사되었다 세석평전-장터목구간은 3.0% 장터목-천왕봉구간은 0%로 조사되었다.

The nature of entrainment between the locomotor and the respiratory rhythm was investigated while normal human subjects were walked or running on a treadmill. The purpose of this study was to analyze the incidence and type of coordination between the locomotor and the respiratory rhythm during running at different work load. The experiments were carried out on 12 untrained volunteers exercising at 3 work loads (2 METs, 3 METs, 4 METs in randomized order). The gait cycle was measured by electromyography (EMG) signal of gastrocnemius firing and the respiratory cycle was measured by a thermometer. We found that the ratio between the locomotor and the respiratory rhythm existed and 2:1 ratio between the locomotor-respiratory coupling was dominant at 2 METs and 3 METs