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- Title
The Effect of Consuming Carbohydrate With and Without Protein on the Rate of Muscle Glycogen Re-synthesis During Short-Term Post-exercise Recovery: a Systematic Review and Meta-analysis.
- Authors
Craven, Jonathan; Desbrow, Ben; Sabapathy, Surendran; Bellinger, Phillip; McCartney, Danielle; Irwin, Christopher
- Abstract
Background: Rapid restoration of muscle glycogen stores is imperative for athletes undertaking consecutive strenuous exercise sessions with limited recovery time (e.g. ≤ 8 h). Strategies to optimise muscle glycogen re-synthesis in this situation are essential. This two-part systematic review and meta-analysis investigated the effect of consuming carbohydrate (CHO) with and without protein (PRO) on the rate of muscle glycogen re-synthesis during short-term post-exercise recovery (≤ 8 h). Methods: Studies were identified via the online databases Web of Science and Scopus. Investigations that measured muscle glycogen via needle biopsy during recovery (with the first measurement taken ≤ 30 min post-exercise and at least one additional measure taken ≤ 8 h post-exercise) following a standardised exercise bout (any type) under the following control vs. intervention conditions were included in the meta-analysis: part 1, water (or non-nutrient beverage) vs. CHO, and part 2, CHO vs. CHO+PRO. Publications were examined for methodological quality using the Rosendal scale. Random-effects meta-analyses and meta-regression analyses were conducted to evaluate intervention efficacy. Results: Overall, 29 trials (n = 246 participants) derived from 21 publications were included in this review. The quality assessment yielded a Rosendal score of 61 ± 8% (mean ± standard deviation). Part 1: 10 trials (n = 86) were reviewed. Ingesting CHO during recovery (1.02 ± 0.4 g·kg body mass (BM)−1 h−1) improved the rate of muscle glycogen re-synthesis compared with water; change in muscle glycogen (MGΔ) re-synthesis rate = 23.5 mmol·kg dm−1 h−1, 95% CI 19.0–27.9, p < 0.001; I2 = 66.8%. A significant positive correlation (R2 = 0.44, p = 0.027) was observed between interval of CHO administration (≤ hourly vs. > hourly) and the mean difference in rate of re-synthesis between treatments. Part 2: 19 trials (n = 160) were reviewed. Ingesting CHO+PRO (CHO: 0.86 ± 0.2 g·kg BM−1 h−1; PRO: 0.27 ± 0.1 g·kg BM−1 h−1) did not improve the rate of muscle glycogen re-synthesis compared to CHO alone (0.95 ± 0.3 g·kg BM−1 h−1); MGΔ re-synthesis rate = 0.4 mmol·kg dm−1 h−1, 95% CI −2.7 to 3.4, p = 0.805; I2 = 56.4%. Conclusions: Athletes with limited time for recovery between consecutive exercise sessions should prioritise regular intake of CHO, while co-ingesting PRO with CHO appears unlikely to enhance (or impede) the rate of muscle glycogen re-synthesis. Trial Registration: Registered at the International Prospective Register of Systematic Reviews (PROSPERO) (identification code CRD42020156841).
- Subjects
GLYCOGEN; SCIENCE databases; COOLDOWN; CARBOHYDRATES; MUSCLE proteins; NEEDLE biopsy; PROTEINS; SKELETAL muscle; META-analysis; CONFIDENCE intervals; FOOD consumption; SYSTEMATIC reviews; ATHLETES; QUALITY assurance; DESCRIPTIVE statistics; DIETARY carbohydrates; DATA analysis software
- Publication
Sports Medicine - Open, 2021, Vol 7, Issue 1, p1
- ISSN
2199-1170
- Publication type
Article
- DOI
10.1186/s40798-020-00297-0