Document Detail

Exercise Performance over the Menstrual Cycle in Temperate and Hot, Humid Conditions.
MedLine Citation:
PMID:  22776870     Owner:  NLM     Status:  Publisher    
PURPOSE: This study investigated effects of the menstrual cycle on prolonged exercise performance both in temperate (20°C, 45% relative humidity) and hot, humid (32°C, 60% relative humidity) conditions. METHODS: For each environmental condition twelve recreationally active females were tested during early follicular (day 3-6) and mid-luteal phases (day 19-25), verified by measurement of estradiol and progesterone. For all four tests thermoregulatory, cardiorespiratory and perceptual responses were measured during 60 min of exercise at 60% of maximal oxygen consumption followed by an incremental test to exhaustion. RESULTS: No differences in exercise performance between menstrual cycle phases were found during temperate conditions (n=8), despite a higher resting and submaximal exercise core temperature (Tc) in the luteal phase. In hot, humid conditions (n=8), however, prolonged exercise performance, as exercise time to fatigue, was significantly reduced during the luteal phase. This finding was not only accompanied by higher resting and submaximal exercise Tc, but also a higher rate of increase in Tc during the luteal phase. Furthermore, submaximal exercise heart rate, minute ventilation and rating of perceived exertion measures were higher during the luteal phase in hot, humid conditions. No significant differences were found over the menstrual cycle in heat loss responses (partitional calorimetry, sweat rate, upper arm sweat composition) and Tc at exhaustion. CONCLUSION: In temperate conditions no changes in prolonged exercise performance were found over the menstrual cycle, while in hot, humid conditions performance was decreased during the luteal phase. The combination of both exercise and heat stress with the elevated luteal phase Tc at the onset of exercise resulted in physiological and perceptual changes and a greater thermosensitivity, which may explain the decrease in performance.
Xanne A K Janse de Jonge; Martin W Thompson; Vivienne H Chuter; Leslie N Silk; Jeanette M Thom
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-6
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-10     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:  -    
1School of Environmental & Life Sciences, University of Newcastle, Australia 2Faculty of Health Sciences, The University of Sydney, Australia 3School of Health Sciences, University of Newcastle, Australia 4School of Sport, Health and Exercise Sciences, Bangor University, United Kingdom.
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