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Effect of lactulose on ammonia metabolism during exercise Shohei Onishi 1 , Hajime Yamazaki 1 , Chiyomi Obayashi 1 , Yoshihiro Suzuki 1 1Sports Medicine Research Center, Keio University Keyword: アンモニア(ammonia) , 運動(exercise) , ラクチュロース(lactulose) pp.693-697
Published Date 1990/7/15
DOI https://doi.org/10.11477/mf.1404900182
  • Abstract
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In seven athletes, the effects of lactulose on am-monia metabolism during dynamic exercise were studied with a cylce ergometer. Each subject per-formed a graded incremental test with increases in work rate of 300 kpm/3 min until exhaustion set in, on two separate days, one without lactulose and one with 20 mg/day lactulose for 3 days.

Without lactulose, maximal heart rate and peak oxygen uptake (VO2 were 193 beats/min and 4280 ml/min, respectively. LA was unchanged early in exercise, but elevated rapidly at work rates of 900 kpm (54% beak VO2) and thereafter. AMM increased even at rates as low as 600 kpm (40% peak VO2) and continued to rise attaining peak value at the ter-mination of exercise. After exercise, AMM de-creased rapidly. On the other hand, LA was still significantly above the basal level after 30 min of recovery. After lactulose, heart rate, duration of exercise or LA was not significantly different from the value without lactulose at the same work rate, however, AMM at low work rate was lower and Vo2 at 1500 kpm was higher. Lactulose had small but significant effects on some parameters of graded exercise.


Copyright © 1990, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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