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Impact of Caffeine and Protein on Post-Exercise Muscle Glycogen Synthesis.
MedLine Citation:
PMID:  21986807     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND:: Both protein and caffeine co-ingestion with carbohydrate (CHO) have been suggested to represent effective dietary strategies to further accelerate post-exercise muscle glycogen synthesis in athletes. PURPOSE:: To assess the impact of protein or caffeine co-ingestion on post-exercise muscle glycogen synthesis rates when optimal amounts of carbohydrate are ingested. METHODS:: 14 male cyclists were studied on 3 different test days. Each test day started with a glycogen depleting exercise session. This was followed by a 6 h recovery period, during which subjects received 1.2 g·kg·h carbohydrate (CHO), or the same amount of carbohydrate with 0.3 g·kg·h of a protein plus leucine mixture (CHO+PRO) or 1.7 mg·kg·h caffeine (CHO+CAF). All drinks were enriched with ]U-C6[ labelled glucose to assess potential differences in the appearance rate of ingested glucose from the gut. Muscle biopsies were collected immediately after cessation of exercise and after 6 h of post-exercise recovery. RESULTS:: The plasma insulin response was higher in CHO+PRO compared with CHO and CHO+CAF (P<0.01). Plasma glucose responses and glucose appearance rates did not differ between experiments. Muscle glycogen synthesis rates averaged 31±4, 34±4 and 31±4 mmol·kg dw·h in CHO, CHO+PRO and CHO+CAF, respectively (P=NS). In accordance, histochemical analyses did not show any differences between net changes in type I and type II muscle fiber glycogen content between experiments. CONCLUSION:: Co-ingestion of protein or caffeine does not further accelerate post-exercise muscle glycogen synthesis when ample amounts of carbohydrate (1.2 g·kg·h) are ingested.
Authors:
Milou Beelen; Janneau van Kranenburg; Joan M Senden; Harm Kuipers; Luc J C van Loon
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-10-7
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-10-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Human Movement Sciences, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University Medical Centre+ (MUMC+), Maastricht, the Netherlands.
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