Langill, R. H., Smith, G. J., & Rhodes, E. C. (2001). The effect of pre-exercise glucose ingestion on performance during prolonged swimming. Medicine and Science in Sports and Exercise, 33(5), Supplement abstract 937.

The effect of pre-exercise glucose ingestion on endurance-swimming performance (4000 m) was assessed. Male triathletes (N = 10) performed a swimming trial following the consumption of a) 10% glucose solution five minutes before exercise, b) 10% glucose solution 35 minutes before exercise, and c) a similar volume of placebo.

A significant glucose difference before exercise was observed. Performance, post-exercise blood glucose, and average heart rate were similar after exercise.

Implication. Pre-performance glucose supplementation does not affect endurance-swimming performance.

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