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Pre-exercise branched-chain amino acid administration increases endurance performance in rats
P Calders1, J L Pannier, D M Matthys
1Laboratory of Normal and Pathological Physiology, University of Gent, Belgium.
Medicine and Science in Sports and Exercise
|October 6, 1997
Summary
Pre-exercise branched-chain amino acid (BCAA) supplementation in rats significantly improved endurance performance. However, BCAA administration also led to increased blood ammonia levels during exercise.
Area of Science:
- Exercise Physiology
- Biochemistry
- Nutritional Science
Background:
- Branched-chain amino acids (BCAAs) are essential amino acids involved in energy metabolism.
- BCAA supplementation is explored for its potential ergogenic effects.
- The impact of BCAAs on exercise-induced ammonia accumulation requires further investigation.
Purpose of the Study:
- To investigate the effects of pre-exercise BCAA administration on endurance capacity.
- To examine the influence of BCAA supplementation on blood ammonia levels during treadmill exercise in rats.
Main Methods:
- Adult female Wistar rats were trained and administered either placebo or BCAAs intraperitoneally before exercise.
- Exercise protocols included 30 minutes of submaximal exercise or running to exhaustion.
- Blood samples were analyzed for glucose, NEFA, lactic acid, BCAA, ammonia, and free-tryptophan levels.
Main Results:
- BCAA administration significantly increased mean run time to exhaustion compared to placebo (99 ± 9 min vs. 76 ± 4 min, P < 0.01).
- Blood ammonia levels were significantly higher in BCAA-treated rats during both submaximal and exhaustive exercise.
- Plasma BCAA levels increased threefold within 5 minutes post-administration.
Conclusions:
- Pre-exercise BCAA administration enhances endurance performance in rats.
- BCAA supplementation during exercise leads to elevated blood ammonia levels.
- Further research is needed to elucidate the mechanisms behind BCAA-induced ammonia increase and its implications.