Volume 7 Supplement 1

Proceedings of the Seventh International Society of Sports Nutrition (ISSN) Conference and Expo

Open Access

Post-exercise carbohydrate plus whey protein hydrolysates supplementation increases skeletal muscle glycogen level in rats

  • Atsushi Kanda1,
  • Masashi Morifuji1,
  • Jinichiro Koga1,
  • Kentaro Kawanaka2 and
  • Mitsuru Higuchi3
Journal of the International Society of Sports Nutrition20107(Suppl 1):P19

https://doi.org/10.1186/1550-2783-7-S1-P19

Published: 15 September 2010

Background

Recent studies have shown that co-ingestion of carbohydrate and protein is more effective than carbohydrate alone for replenishing muscle glycogen after exercise. However, it remains unclear whether the source or degree of hydrolysis of dietary protein influences post-exercise glycogen accumulation. The aim of this study was to compare the effect of dietary protein type on skeletal muscle glycogen levels in the post-exercise phase, and to investigate the effects of post-exercise carbohydrate and protein supplementation on phosphorylated enzymes of Akt/PKB and atypical PKCs.

Methods

Male Sprague-Dawley rats, pre-trained for 3 days, swam with a 2% load of body weight for 4 hours to deplete skeletal muscle glycogen. Immediately after the glycogen-depleting exercise, one group of rats was killed, whereas the other groups were given solutions of either glucose or glucose plus protein (whey protein, whey protein hydrolysates (WPH), casein hydrolysates or branched-chain amino acid (BCAA)). After 2 hours, the rats were killed, followed by analysis of glycogen content and phosphorylated enzymes of Akt/PKB and atypical PKCs in the triceps muscles.

Results

WPH caused significant increases (p < 0.05) in skeletal muscle glycogen level (5.01+/-0.24 mg/g), compared with whey protein (4.23+/-0.24 mg/g), BCAA (3.92+/-0.18 mg/g) or casein hydrolysates (2.73+/-0.22 mg/g). Post-exercise ingestion of glucose plus WPH caused significant increases (p < 0.05) in both phosphorylated Akt/PKB (131%) and phosphorylated PKCζ(154%) levels compared with glucose only. There was a significant positive correlation between skeletal muscle glycogen content and phosphorylated Akt/PKB (r = 0.674, p < 0.001) and PKCζ (r = 0.481, p = 0.017) in the triceps muscles.

Conclusion

It is concluded that post-exercise supplementation with carbohydrate and WPH increases skeletal muscle glycogen recovery by activating key enzymes such as Akt/PKB and atypical PKCs.

Authors’ Affiliations

(1)
Food and Health R&D Laboratories, Meiji Seika Kaisha Ltd
(2)
Department of Health and Nutrition, Niigata University of Health and Welfare
(3)
Faculty of Sport Sciences, Waseda University

Copyright

© Kanda et al;licensee BioMed Central Ltd. 2010

Advertisement