Alghannam AF, Templeman I, Thomas JE, Jedrzejewski D, Griffiths S, Lemon J, Byers T, Reeves S, Gonzalez JT, Thompson D, Bilzon J, Tsintzas K, Betts JA. Effect of carbohydrate-protein supplementation on endurance training adaptations.
Eur J Appl Physiol 2020;
120:2273-87. [PMID:
32757065 DOI:
10.1007/s00421-020-04450-1]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 07/30/2020] [Indexed: 12/28/2022]
Abstract
Purpose
To examine the influence of post-exercise protein feeding upon the adaptive response to endurance exercise training.
Methods
In a randomised parallel group design, 25 healthy men and women completed 6 weeks of endurance exercise training by running on a treadmill for 30–60 min at 70–75% maximal oxygen uptake (VO2max) 4 times/week. Participants ingested 1.6 g per kilogram of body mass (g kg BM−1) of carbohydrate (CHO) or an isocaloric carbohydrate–protein solution (CHO-P; 0.8 g carbohydrate kg BM−1 + 0.8 g protein kg BM−1) immediately and 1 h post-exercise. Expired gas, blood and muscle biopsy samples were taken at baseline and follow-up.
Results
Exercise training improved VO2max in both groups (p ≤ 0.001), but this increment was not different between groups either in absolute terms or relative to body mass (0.2 ± 0.2 L min−1 and 3.0 ± 2 mL kg−1 min−1, respectively). No change occurred in plasma albumin concentration from baseline to follow-up with CHO-P (4.18 ± 0.18 to 4.23 ± 0.17 g dL−1) or CHO (4.17 ± 0.17 to 4.12 ± 0.22 g dL−1; interaction: p > 0.05). Mechanistic target of rapamycin (mTOR) gene expression was up-regulated in CHO-P (+ 46%; p = 0.025) relative to CHO (+ 4%) following exercise training.
Conclusion
Post-exercise protein supplementation up-regulated the expression of mTOR in skeletal muscle over 6 weeks of endurance exercise training. However, the magnitude of improvement in VO2max was similar between groups.
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