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 mM, 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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