Document Detail

The menstrual cycle and exercise: performance, muscle glycogen, and substrate responses.
MedLine Citation:
PMID:  2606593     Owner:  NLM     Status:  MEDLINE    
Six eumenorrheic females (age = 26.3 +/- 2.4 yrs; X +/- SE) exercised until exhaustion (EE; 70% VO2max) at the midluteal (LP, 7-8 days after ovulation) and midfollicular (FP, days 7-8) phases of their menstrual cycles. Phases were confirmed by estradiol and progesterone concentrations. Each EE test was preceded by a depletion exercise bout (DE; 90 min, 60% VO2max and 4 x 1 min, 100% VO2max) and 3 days of rest/diet control. Muscle biopsies 1% (vastus lateralis) were taken post-DE, pre-EE, and post-EE and then analyzed for glycogen content. There was a strong tendency (P less than 0.07) for EE duration to be greater during LP (139.2 +/- 14.9 min) than FP (126 +/- 17.5 min). Glycogen repletion (pre-EE minus post-DE) following DE was greater (P = 0.05) during the LP than FP (88.2 +/- 4.7 vs 72.8 +/- 5.7 mumol/g w. w. muscle). However, EE glycogen utilization (pre-EE minus post-EE/EE time) did not differ between phases (LP = 0.41 +/- 0.08 mumol/g w. w. muscle/min vs FP = 0.33 +/- 0.11 mumol/g w. w. muscle/min; P = 0.17). The results suggest that exercise performance and muscle glycogen content are enhanced during the LP of the menstrual cycle. These findings imply athletic performance may be affected by the phases of the menstrual cycle.
B J Nicklas; A C Hackney; R L Sharp
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  10     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  1989 Aug 
Date Detail:
Created Date:  1990-02-21     Completed Date:  1990-02-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  264-9     Citation Subset:  IM    
Exercise Biochemistry Laboratory, Iowa State University, Ames 50010.
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MeSH Terms
Estradiol / blood
Exercise Test
Fatty Acids, Nonesterified / blood
Glycogen / metabolism*
Heart Rate
Lactates / blood
Lactic Acid
Menstrual Cycle*
Muscles / metabolism*
Oxygen Consumption
Progesterone / blood
Reg. No./Substance:
0/Fatty Acids, Nonesterified; 0/Lactates; 50-21-5/Lactic Acid; 50-28-2/Estradiol; 57-83-0/Progesterone; 9005-79-2/Glycogen

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