Trained long distance runner and average students were made run a long distance (3,000-20,000m), as subjects. During that, the authers investigated the changes of the blood sugar leval and the free fatty acid concentration in the blood. In this case, the running speed was set at their maximum level or to its nearest. Consequently, the blood sugar level in the first period of the exercise showed higher than that at rest. This phenomenon continued while the trained long distance runner were running more than lO,O0Om, and the average students 1,O00-2,O00m. When they were kept running moreover, the blood sugar level decreased at 53-90 per cent of that at resting level. The free fatty acid concentration in the blood increased with the exercise. So far, the free fatty acid concentration in the blood has been regarded to increase reciprocally with the decrease of the blood sugar level. But, in the first period of the exercise, both the blood sugar and the free fatty acid concentration in the blood increased, whereas such a reciprocal relation could not be seen.
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