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This study examined the influence of prior endurance exercise on hormonal responses to subsequent resistance exercise. Ten males exercised on a cycle ergometer at 50% of maximal oxygen uptake for 60 min and subsequently completed a resistance exercise (bench and leg press, four sets at ten repetitions maximum with an interset rest period of 90 s). Alternatively, the subjects performed the protocol on a separate day with prior endurance exercise limited to 5 min. Blood was obtained before and after the endurance exercise, and 10, 20, and 30 min after the resistance exercise. Maximal isometric torque measured before and after endurance and resistance exercises showed no significant difference between trials. No significant difference was seen in the concentrations of glucose, lactate, testosterone, and cortisol between the trials, but free fatty acids (FFA) and growth hormone (GH) increased (P<0.01 and P<0.05, respectively) after 60 min of endurance exercise. Conversely, after the resistance exercise, GH was attenuated by 60 min of prior exercise (P<0.05). These results indicate that the GH response to resistance exercise is attenuated by prior endurance exercise. This effect might be caused by the increase in blood FFA concentration at the beginning of resistance exercise.

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AbstractThe purpose of this study was to examine the physical activity of school children during camping in a mountain environment. The subjects were 20 children (1 st  3 rd grade) who participated in the camp, which was carried out in a typical mountain village area of Tohoku district duringˆve days in the summer vacation. Physical activity (steps and times engaged in light to moderate and vigorous intensities of physical activity) was measured by uniaxial accelerometer (Lifecorder EX , Suzuken Co., Ltd.). The data were compared with those of previous studies on the physical activity of children during weekdays and weekends during school term using the same method. The number of steps during camp activity were similar to those on weekdays during school term, and greater than during holidays. Moreover, the times engaged in light to moderate activity such as standing activity, and fast-paced walking (2.0 6.0 Mets) during the camp were greater than those on weekdays at school and during holidays. These results suggest that children's experience of activities in a natural environment through the camp and interest in natural environments promote voluntary physical activity by children. Therefore, it is possible that such camp activity plays an important role in promoting the voluntary physical activity of children during the long or short vacation.