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Carbohydrate availability affects ammonemia during exercise after beta 2-adrenergic blockade.

D Matthys1, W Derave, P Calders

  • 1Department of Pediatric Cardiology, Institute of Kinesiology and Sport Sciences, University of Ghent, Belgium. dirk.matthys@rug.ac.be

Medicine and Science in Sports and Exercise
|May 5, 2000
PubMed
Summary

Beta-adrenergic blockade impairs carbohydrate availability, leading to higher blood ammonia levels during exercise. Glucose supplementation can reduce ammonia but does not improve exercise capacity.

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Area of Science:

  • Exercise Physiology
  • Biochemistry

Background:

  • Beta-adrenergic blockade is known to increase blood ammonia concentrations during physical exertion.
  • The underlying mechanisms, particularly the role of carbohydrate availability, require further investigation.

Purpose of the Study:

  • To investigate the role of decreased carbohydrate availability in the exercise-induced increase in blood ammonia concentration during beta-adrenergic blockade.
  • To assess the impact of glucose supplementation on ammonia levels and exercise capacity under beta-blockade.

Main Methods:

  • Wistar rats were administered a beta 2-adrenoceptor blocker (ICI 118,551) or placebo, with or without glucose, before treadmill exercise.
  • Blood and muscle samples were analyzed for ammonia, glucose, lactate, FFA, glycerol, BCAA, and glycogen content.

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Main Results:

  • Beta 2-blockade significantly reduced exercise duration and increased blood ammonia levels.
  • Exercise-induced glycogen breakdown was inhibited by beta 2-blockade.
  • Glucose supplementation normalized glycogen breakdown and reduced ammonia levels but did not enhance exercise capacity.

Conclusions:

  • Impaired carbohydrate availability is suggested to be the primary cause of elevated blood ammonia during exercise following beta-blockade.
  • While glucose can mitigate ammonia increase, it does not fully restore exercise performance compromised by beta-blockade.