Presentation Abstract

Session: B-27-Carbohydrate Metabolism: Carbohydrate Intake and Performance
Wednesday, May 28, 2014, 1:00 PM - 6:00 PM
Presentation: 623 - Supplemental Recovery Nutrition affects Swim Performance following Glycogen Depleting Exercise
Location: WB1, Poster Board: 38
Pres. Time: Wednesday, May 28, 2014, 2:00 PM - 3:30 PM
Category: 0609. Metabolism and Nutrition - other
Keywords: swim performance; chocolate milk
Author(s): Joel M. Stager, FACSM, Christopher L. Brammer, Tyler Sossong, Kosuke Kojima, Dustin Spanbauer, Kirk Grand, Brian V. Wright. Indiana University, Bloomington, IN.
Abstract: Refueling glycogen stores following exhaustive workouts is especially important for elite athletes, as it enables them to perform at a high level across multiple training practices within a given day. Chocolate milk (CM) has been shown to be an effective means of refueling glycogen-depleted muscles when recovery time is limited.
PURPOSE: The purpose of this study was to test the efficacy of CM as a recovery aid following an exhaustive exercise bout, as determined by same-day swim performance relying on aerobic, anaerobic, and immediate energy metabolism.
METHODS: On three consecutive weeks, six NCAA division one collegiate swimmers performed a glycogen depleting swim bout of 60 x 91.4-meter (GD), followed by five hours of recovery (REC). Subjects ingested one of three randomized treatment beverages: CM, commercial carbohydrate sports drink (CHO-SD), or calorie-free beverage (CFB) immediately and two hours after the GD. A standard lunch was provided three hours post depletion. Following REC, three swim performance test sets were completed: 4 x 182.9-meter swim bouts (AER; work to rest ratio [W:R] of 6:1), 5 x 68.6-meter swim bouts (AN; W:R of 1:5), and a set of 8 x 10-meter swim bouts (IM; W:R of 1:8 against a resistance that elicited 80% of the workload at the subject’s peak power per stroke). Repeated measures ANOVA was used to test differences in performance among the three treatments.
RESULTS: AER and AN swim performances were different depending on the recovery beverage consumed; F(2,10)=5.41, p = 0.013 and F(2,10)=3.096, p = 0.045, respectively. Post-hoc tests revealed that subjects performed, on average, 2.1 seconds faster per 200-yd repetition with CM (120.3 ± 4.7 s) than with a CHO-SD (122.5 ± 5.4 s) or CFB (122.2 ± 3.7 s). Further, subjects were, on average, 0.5 seconds faster per 75-yd sprint with CM (38.6 ± 2.3 s) than with a CHO-SD (39.3 ± 2.4 s) or CFB (39.0 ± 2.2 s). Finally, IM did not differ among the three post-exercise nutritional recovery treatments; F(2,10)=1.866, p = 0.205.
CONCLUSION: When recovery time is limited, immediate and appropriate nutritional supplementation influences subsequent exercise performances depending upon the specific metabolic pathway supplying muscle energetics used to perform work. Differences in performance are evident despite conventional food intake during the recovery period.
Disclosures:  J.M. Stager: None.