Document Detail

Exhaustive running: inappropriate as a stimulus of muscle glycogen super-compensation.
MedLine Citation:
PMID:  3657489     Owner:  NLM     Status:  MEDLINE    
Muscle glycogen super-compensation, as demonstrated after exhaustive cycling, may be affected by mode of exercise and state of training. Hence, we studied the effect of exhaustive running on post-exercise changes in muscle glycogen concentration in untrained subjects and compared the effect of tapered running with an exhaustive bout of running in well-trained runners. Six trained runners (T), 6 untrained subjects (UT), and 6 physically active subjects participated. Four hundred grams of carbohydrate were given for 2 d (PX2 and PX1) before exercise and 600 g for 3 d (R1, R2, and R3) with rest afterwards. Before exercise, T and UT were restricted in physical activity. Biopsies were obtained from the gastrocnemius muscle on PX2 and PX1 in T, and before (PX0), immediately after exercise (R0), and on R1, R2, and R3 in all groups. Muscle glycogen increased from 110 (+/-14) on PX2 to 180 (+/-11) mmol X kg-1 on PX0 in T (P less than 0.001). This PX0 value was higher than the PX0 value for UT, which was 102 (+/-8) mmol X kg-1 (P less than 0.005). R0 values were 57 (+/-14) and 26 (+/-4) mmol X kg-1, respectively. On R1, the glycogen concentration had increased to 127 (+/-10) and 87 (+/-3) mmol X kg-1 (P less than 0.001). No changes occurred during R2 and R3. In a supplementary study, physically active subjects rested (series I) or ran lightly for 40 min (series II) on PX2 and PX1, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
P C Blom; D L Costill; N K Vøllestad
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  19     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1987 Aug 
Date Detail:
Created Date:  1987-10-26     Completed Date:  1987-10-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  398-403     Citation Subset:  IM; S    
Department of Physiology, National Institute for Occupational Health, Oslo, Norway.
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MeSH Terms
Dietary Carbohydrates / administration & dosage
Glycogen / biosynthesis*
Muscles / metabolism*
Research Design
Time Factors
Reg. No./Substance:
0/Dietary Carbohydrates; 9005-79-2/Glycogen

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