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Co-ingestion of carbohydrate and whey protein isolates enhance PGC-1 alpha mRNA expression: a randomised, single blind, cross over study

Hill, Karen M, Stathis, Christos ORCID: 0000-0003-0064-9523, Grinfeld, Esther, Hayes, Alan and McAinch, Andrew (2013) Co-ingestion of carbohydrate and whey protein isolates enhance PGC-1 alpha mRNA expression: a randomised, single blind, cross over study. Journal of the International Society of Sports Nutrition, 10 (8). pp. 1-8. ISSN 1550-2783 (print) 1550-2783 (online)

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Abstract

Background: Whey protein isolates (WPI) supplementation is known to improve resistance training adaptations. However, limited information is available on the effects of WPI plus carbohydrate (CHO) supplementation on endurance training adaptations. Method: Six endurance trained male cyclists and triathletes (age 29 ± 4 years, weight 74 ± 2 kg, VO2 max 63 ± 3 ml oxygen. kg-1. Min-1, height 183 ± 5 cm; mean ± SEM) were randomly assigned to one of two dietary interventions in a single blind cross over design; CHO or CHO + WPI. Each dietary intervention was followed for 16 days which included the last 2 days having increased CHO content, representing a CHO loading phase. The dietary interventions were iso-caloric and carbohydrate content matched. On completion of the dietary intervention, participants performed an exercise bout, consisting of cycling for 60 min at 70% VO2 max, followed by time trial to exhaustion at 90% VO2 max and recovered in the laboratory for 6 hours. Blood samples and muscle biopsies were taken at various time points at rest and through the exercise trial and recovery. Results: Compared to CHO, CHO + WPI increased plasma insulin during recovery at 180 mins (P < 0.05) and peroxisome proliferator-activated receptor gamma coactivator-1 alpha (PGC-1α) mRNA expression at the end of 6 hours of recovery (P < 0.05). Muscle glycogen did not differ between the two trials. Conclusion: This study showed co-ingestion of CHO + WPI may have beneficial effects on recovery and adaptations to endurance exercise via, increased insulin response and up regulation of PGC-1α mRNA expression.

Item Type: Article
Uncontrolled Keywords: VO2max, mitochondrial biogenesis, muscle glycogen, muscle protein synthesis, MPS, Messenger RNA expression, mRNA, protein supplementation, endurance exercise adaptation
Subjects: Faculty/School/Research Centre/Department > School of Biomedical and Health Sciences
FOR Classification > 1103 Clinical Sciences
FOR Classification > 1106 Human Movement and Sports Science
FOR Classification > 1111 Nutrition and Dietetics
Depositing User: VUIR
Date Deposited: 30 Aug 2013 04:50
Last Modified: 21 Mar 2019 02:06
URI: http://vuir.vu.edu.au/id/eprint/21976
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