EFFECTS OF EXERCISE DURATION ON POST-EXERCISE GLUCOSE METABOLISM

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  • 運動後の糖代謝に及ぼす運動負荷時間の影響について
  • ウンドウゴ ノ トウタイシャ ニ オヨボス ウンドウ フカ ジカン ノ エイキ

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Abstract

Effects of bicycle exercise duration (i. e., 20, 40 and 60 min) on post-exercise glucose metabolism was studied in four healthy untrained men (19.8±0.4 yr), who were previously considered normal on a resting oral glucose tolerance test (OGTT) . These three exercises were performed on different days. The intensity of exercise corresponded to approximately 60% of VO2max. A glucose sample of 100-g/300 ml was orally administered on 20 min after the completion of each exercise. Blood samples were obtained from a forearm vein before exercise, immediately after and on 20 min after the cessation of exercise, and on 30, 60, 90, 120 and 180 min after glucose ingestion. The following results were obtained. 1) Blood glucose concentrations observed on 60, 90, 120 and 180 min after glucose ingestion following 60 min exercise appeared to be higher than OGTT levels, indicating the time delay to return to the resting level. 2) Serum insulin concentrations after glucose ingestion following 20 and 40 min exercise were lower than OGTT levels. Changes in serum insulin concentrations following 60 min exercise were similar to those on OGTT levels with the exception of the level on 30 min after glucose ingestion. Serum C-peptide response curves were similar to serum insulin response curves after each exercise. 3) Serum free fatty acids (FFA) increased during each exercise as compared to a resting level and increased further after each exercise. The degree of changes in FFA was most significant during a recovery period following 60 min exercise, however, it decreased abruptly after glucose ingestion as a case after 20 and 40 min exercise. 4) Plasma cyclic-AMP concentrations increased most profoundly during 60 min exercise. Plasma cyclic-AMP level before glucose ingestion was also higher following 60 min exercise. These results suggested that postexercise glucose metabolism after glucose ingestion tended to be decreased with elevated rates of serum FFA during a recovery period following 60 min exercise.

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