Steiner, J., Curmaci, A., Patrie, J., Gaesser, B., & Weltman, A. (2009). Effects of carbohydrate supplementation on the rating of perceived exertion-blood lactate relationship. ACSM 56th Annual Meeting, Seattle, Washington. Presentation number 1454.

This study examined the effects of carbohydrate ingestion on the blood lactate-rating of perceived exertion relationship during incremental and constant effort exercise. Male (N = 6) and female (N = 3) Ss completed two incremental cycling LT/VO2peak tests followed by two 45-minute production trials. Either ~240 ml of a carbohydrate or placebo was ingested before and every 15 minutes during the exercises.

No differences were observed between conditions at lactate threshold, 2.5 or 4.0 mmol/l, and lactate peak. In the carbohydrate condition, blood glucose was higher than in the placebo condition. During the production trials (rating of perceived exertion of 16), in the carbohydrate condition a higher blood glucose area under the curve was recorded.

Implication. Carbohydrate ingestion does not alter the blood lactate-rating of perceived exertion relationship during incremental LT/VO2peak cycling.

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