出版社：Japan Society of Physical Education, Health and Sport Sciences
摘要：Both positive work and negative work are often done in the practical movements. For example, they appear in going up and down stairs, raising and lowering weights, and climbing and coming down a rope. The purpose of this study was to compare physiologically the positive work with the negative work in the case of going up and down stairs. The subjects were four healthy adults. They went up and down stairs in place on a motor driven escalator. Each ascent and descent was made in exactly 5 minutes, giving total 340 steps. The rates of motion were vertically 13.7m/min and horizontally 23.8m/min. The expired gas was collected into Douglas bag and ECG was recorded during work and first 5 minutes of recovery following work. The weight of bag together with the light clothing was 4-5 kg. Experiments were performed with each subject carrying the bag alone and additional loads of l0, 15, 20, 25kg. The results showed that during the positive work the heart rate and 0_2 consumption increased linearly with increasing loads. However, in the negative work there was hardly any difference between the heart rates and 0_2 consumption when carried a bag alone and a bag with additional loads.
其他摘要：Both positive work and negative work are often done in the practical movements. For example, they appear in going up and down stairs, raising and lowering weights, and climbing and coming down a rope. The purpose of this study was to compare physiologically the positive work with the negative work in the case of going up and down stairs. The subjects were four healthy adults. They went up and down stairs in place on a motor driven escalator. Each ascent and descent was made in exactly 5 minutes, giving total 340 steps. The rates of motion were vertically 13.7m/min and horizontally 23.8m/min. The expired gas was collected into Douglas bag and ECG was recorded during work and first 5 minutes of recovery following work. The weight of bag together with the light clothing was 4-5 kg. Experiments were performed with each subject carrying the bag alone and additional loads of l0, 15, 20, 25kg. The results showed that during the positive work the heart rate and 0_2 consumption increased linearly with increasing loads. However, in the negative work there was hardly any difference between the heart rates and 0_2 consumption when carried a bag alone and a bag with additional loads.
