Influence of Post-Exercise Carbohydrate-Protein Ingestion on Muscle Glycogen Metabolism in Recovery and Subsequent Running Exercise

Apr 21, 2016International journal of sport nutrition and exercise metabolism

How Eating Carbohydrates and Protein After Exercise Affects Muscle Energy Recovery and Later Running

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Abstract

Muscle glycogen concentrations increased to 252 ± 45 mmol·kg dry mass during recovery with carbohydrate intake.

Carbohydrate-protein ingestion did not significantly change muscle glycogen concentrations after initial exhaustive exercise.
Muscle glycogen levels were similar between carbohydrate-protein and carbohydrate-only treatments post-recovery.
Glycogen degradation rates during subsequent exercise were comparable between both treatment groups.
Time-to-exhaustion during both initial and subsequent runs was not significantly different between carbohydrate-protein and carbohydrate-only groups.

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We examined whether carbohydrate-protein ingestion influences muscle glycogen metabolism during short-term recovery from exhaustive treadmill running and subsequent exercise. Six endurance-trained individuals underwent two trials in a randomized double-blind design, each involving an initial run-to-exhaustion at 70% VO(Run-1) followed by 4-h recovery (REC) and subsequent run-to-exhaustion at 70% VO(Run-2). Carbohydrate-protein (CHO-P; 0.8 g carbohydrate·kg body mass [BM]·hplus 0.4 g protein·kg BM·h) or isocaloric carbohydrate (CHO; 1.2 g carbohydrate·kg BM·h) beverages were ingested at 30-min intervals during recovery. Muscle biopsies were taken upon cessation of Run-1, postrecovery and fatigue in Run-2. Time-to-exhaustion in Run-1 was similar with CHO and CHO-P (81 ± 17 and 84 ± 19 min, respectively). Muscle glycogen concentrations were similar between treatments after Run-1 (99 ± 3 mmol·kg dry mass [dm]). During REC, muscle glycogen concentrations increased to 252 ± 45 mmol·kg dmin CHO and 266 ± 30 mmol·kg dmin CHO-P (p = .44). Muscle glycogen degradation during Run-2 was similar between trials (3.3 ± 1.4 versus 3.5 ± 1.9 mmol·kg dm·minin CHO and CHO-P, respectively) and no differences were observed at the respective points of exhaustion (93 ± 21 versus 100 ± 11 mmol·kg dm; CHO and CHO-P, respectively). Similarly, time-to-exhaustion was not different between treatments in Run-2 (51 ± 13 and 49 ± 15 min in CHO and CHO-P, respectively). Carbohydrate-protein ingestion equally accelerates muscle glycogen resynthesis during short-term recovery from exhaustive running as when 1.2 g carbohydrate·kg BM·hare ingested. The addition of protein did not alter muscle glycogen utilization or time to fatigue during repeated exhaustive running. 2max2max -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1

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Influence of Post-Exercise Carbohydrate-Protein Ingestion on Muscle Glycogen Metabolism in Recovery and Subsequent Running Exercise

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