| Exercise VE and physical performance at altitude are not affected by menstrual cycle phase. | |
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MedLine Citation:
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PMID: 10233113 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We hypothesized that progesterone-mediated ventilatory stimulation during the midluteal phase of the menstrual cycle would increase exercise minute ventilation (VE; l/min) at sea level (SL) and with acute altitude (AA) exposure but would only increase arterial O2 saturation (SaO2, %) with AA exposure. We further hypothesized that an increased exercise SaO2 with AA exposure would enhance O2 transport and improve both peak O2 uptake (VO2 peak; ml x kg-1 x min-1) and submaximal exercise time to exhaustion (Exh; min) in the midluteal phase. Eight female lowlanders [33 +/- 3 (mean +/- SD) yr, 58 +/- 6 kg] completed a VO2 peak and Exh test at 70% of their altitude-specific VO2 peak at SL and with AA exposure to 4,300 m in a hypobaric chamber (446 mmHg) in their early follicular and midluteal phases. Progesterone levels increased (P < 0.05) approximately 20-fold from the early follicular to midluteal phase at SL and AA. Peak VE (101 +/- 17) and submaximal VE (55 +/- 9) were not affected by cycle phase or altitude. Submaximal SaO2 did not differ between cycle phases at SL, but it was 3% higher during the midluteal phase with AA exposure. Neither VO2 peak nor Exh time was affected by cycle phase at SL or AA. We conclude that, despite significantly increased progesterone levels in the midluteal phase, exercise VE is not increased at SL or AA. Moreover, neither maximal nor submaximal exercise performance is affected by menstrual cycle phase at SL or AA. |
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Authors:
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B A Beidleman; P B Rock; S R Muza; C S Fulco; V A Forte; A Cymerman |
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Publication Detail:
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Type: Clinical Trial; Journal Article |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 86 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 1999 May |
Date Detail:
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Created Date: 1999-06-28 Completed Date: 1999-06-28 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1519-26 Citation Subset: IM; S |
Affiliation:
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Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, USA. BBEIDLEMAN@NATICK.CCMAIL.ARMY.MIL |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Altitude* Anaerobic Threshold / physiology Estrogens / blood, physiology Exercise / physiology* Exercise Test Female Humans Male Menstrual Cycle / physiology* Oxygen Consumption / physiology Progesterone / blood, physiology Respiratory Function Tests Respiratory Mechanics / physiology* Rest / physiology |
| Chemical | |
Reg. No./Substance:
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0/Estrogens; 57-83-0/Progesterone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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