The effect of the menstrual cycle and water ingestion on physiological responses during prolonged exercise at moderate intensity under hot conditions
Hashimoto H, Ishijima T, Suzuki K, Higuchi M
The Journal of sports medicine and physical fitness · 0 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Controlled clinical trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Funding not disclosed
Publication
- Published
- 2015-07-15 · J Sports Med Phys Fitness · vol. 56 · issue 9
- Publisher
- National Institutes of Health
- Cited
- 16 citations · more than 80% of similar papers · 1.3× the field average
- References
- 0 works
- Access
- Paywalled
- Research areas
- Thermoregulation and physiological responses · Exercise and Physiological Responses · Muscle metabolism and nutrition
- Keywords
- Ingestion, Thermoregulation, Menstrual cycle, Cardiorespiratory fitness, Internal medicine, Endocrinology, Medicine, Exercise intensity, Intensity (physics), Hyperthermia, Hormone, Physiology, Animal science, Heart rate, Biology
4 authors
From JP
- Hideki HashimotoWaseda University
- Toshimichi Ishijima
- Katsuhiko Suzuki
- Mitsuru Higuchi
Abstract
Aim
Reproductive hormones are likely to be involved in thermoregulation through body fluid dynamics. In the present study, we aimed to investigate the effect of the menstrual cycle and water ingestion on physiological responses to prolonged exercise at moderate intensity under hot conditions.
Methods
Eight healthy young women with regular menstrual cycles performed cycling exercise for 90 min at 50% VO2peak intensity during the low progesterone (LP) level phase and high progesterone (HP) level phase, with or without water ingestion, under hot conditions (30°C, 50% relative humidity). For the water ingestion trials, subjects ingested water equivalent to the loss in body weight that occurred in the earlier non-ingestion trial. For all four trials, rectal temperature, cardiorespiratory responses, and ratings of perceived exertion (RPE) were measured.
Results
Throughout the 90-min exercise period, rectal temperatures during HP were higher than during LP by an average of 0.4°C in the non-ingestion trial (P < 0.01) and 0.2°C in the water ingestion trial (P < 0.05). During exercise, water ingestion affected the changes in rectal temperature and heat rate (HR) during HP, but it did not exert these effects during LP. Furthermore, we found a negative correlation between estradiol levels and rectal temperature during LP.
Conclusion
During prolonged exercise at moderate intensity under hot conditions, water ingestion is likely to be useful for suppressing the associated increase in body temperature and HR, particularly during HP, whereas estradiol appears to be useful for suppressing the increase in rectal temperature during LP.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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