Simsch, C., Moshidi-Muhl, D., Bohm, B. O., Fehrenbach, E., Northoff, H., Trajanoski, Z., Steinacher, J. M., & Lehmann, M. (2001). Supplement of carbohydrates during prolonged exhaustive exercise: Influence on performance, stress reaction, and cytokines. Medicine and Science in Sports and Exercise, 33(5), Supplement abstract 253.

Well-trained triathletes (N = 8) performed two 2-hour bouts on a cycling ergometer, each followed by a ramp test. Every 15 minutes during the exercise, a placebo or a CHO solution was administered.

Stress-related hormones and ratings of exertion were less in the CHO group, while performance increased more than in the placebo group. There was no relationship between the ramp test result and any hormonal level. The cytokine response was unrelated to metabolic factors and consequently, does not appear to be a performance predictor.

Implication. CHO supplementation during extended endurance activities reduces stress and increases performance.

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