PROTEIN + CARBOHYDRATE IN RECOVERY DOES NOT ENHANCE SUBSEQUENT ENDURANCE PERFORMANCE WHEN COMPARED TO CARBOHYDRATE ALONE
Mattern, C. O., Campbell, B., Carson, T., Charland, J., Craven, S., Filip, N., Watt, C., Yaple, R., & Heidi, B. K. (2012). The addition of protein to a carbohydrate supplement enhances fluid retention but not running performance. Presentation 2356 at the 59th Annual Meeting of the American College of Sports Medicine, San Francisco, California; May 29-June 2, 2012.
This study determined if a carbohydrate + protein (CHO + PRO) beverage during and/or after endurance exercise improves performance in a subsequent exercise bout compared to CHO alone. Secondly, fluid retention was assessed as a possible mechanism for enhanced performance. Endurance trained subjects (N = 9) received a beverage containing CHO (0.65g of CHO/kg) or CHO + PRO (0.52g of CHO/kg plus 0.13g of protein/kg) during a one-hour run at 68% of VO2max. During a 7-hour recovery period Ss then received beverages containing either CHO (1.0g of CHO/kg) or CHO + PRO (0.80g of CHO/kg plus 0.20g of protein/kg) immediately post-exercise and at 1 and 4 hours of recovery. Urine volume and body weight were measured post-exercise, during recovery at 3, 5, and 7 hours to calculate fluid retention. Subjects then ran a 10-km time-trial.
There were no statistical differences in 10-km running times or measures of blood glucose or insulin during or after exercise between the four nutritional conditions. However fluid retention was significantly higher at hour 5 of recovery in both conditions in which CHO + PRO was provided when compared to CHO alone conditions.
Implication. While a 4:1 ratio of CHO:PRO provided in recovery enhanced fluid retention compared to CHO alone, there was no accompanying improvement in 10-km running performance. Enhanced fluid retention in recovery does not improve subsequent endurance performance.
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