Effect of an Isocaloric Carbohydrate-Protein-Antioxidant Drink on Cycling Performance

Sep 9, 2006Medicine and science in sports and exercise

How a carbohydrate-protein-antioxidant drink with the same calories affects cycling performance

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Abstract

No differences in time to fatigue were observed between the carbohydrate-protein-antioxidant beverage (CHOPA) and the carbohydrate-only beverage (CHO).

Time to fatigue at 70% VO2peak was 95.8 minutes for CHO and 98.1 minutes for CHOPA.
At 80% VO2peak, time to fatigue was 42.3 minutes for CHO and 42.9 minutes for CHOPA.
Postexercise creatine kinase (CK) levels increased significantly from baseline after CHO but not after CHOPA.
Lactate dehydrogenase (LDH) levels also increased after CHO compared to CHOPA.
Median postexercise muscle soreness was higher in the CHO group than in the CHOPA group.

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PURPOSE: Fourteen male cyclists were studied to compare the effect of carbohydrate-protein-antioxidant beverage (CHOPA) to an isocaloric carbohydrate-only (CHO) beverage on time to fatigue and muscle damage.

METHODS: Subjects performed two sets of rides to exhaustion on a cycle ergometer. In each set, the first ride was performed at 70% VO2peak, and the second was performed 24 h later at 80%. CHO or CHOPA was consumed every 15 min during exercise and immediately afterward. Plasma CK and LDH and muscle soreness were measured pre- and postexercise.

RESULTS: Time to fatigue was not different between CHO and CHOPA at 70% VO2peak (95.8 +/- 29.7 vs 98.1 +/- 28.7 min), 80% VO2peak (42.3 +/- 18.6 vs 42.9 +/- 21.8 min), or total performance time (138.1 +/- 39.3 vs 140.9 +/- 43.7 min). Postexercise CK was increased (P < 0.05) from baseline in CHO (203 +/- 120 vs 582 +/- 475 U.L(-1)) but not with CHOPA (188 +/- 119 vs 273 +/- 169 U.L(-1)). Similarly, LDH values increased over baseline in CHO (437 +/- 46 vs 495 +/- 64 U.L(-1)) but not with CHOPA (432 +/- 40 vs 451 +/- 43 U.L(-1)). Postexercise CPK and LDH were higher after the CHO trial than after the CHOPA trial. Median postexercise muscle soreness was higher in CHO (3.0 +/- 5.0) than with CHOPA (1.0 +/- 3.0).

CONCLUSION: No differences in time to fatigue were observed between the beverages, despite lower total carbohydrate content in the CHOPA beverage. The CHOPA beverage attenuated postexercise muscle damage, as evidenced by CK and LDH values, compared with an isocaloric CHO beverage.

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Effect of an Isocaloric Carbohydrate-Protein-Antioxidant Drink on Cycling Performance

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