| Effects of menstrual cycle phase and oral contraceptive use on intermittent exercise. | |
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MedLine Citation:
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PMID: 9840414 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Five women using low-dose, monophasic oral contraceptive (OC) agents (OC group) and ten normally menstruating women (Non-OC group) performed a treadmill protocol to determine the effect of OCs and the menstrual cycle (MC) on intermittent exercise performance and some commonly used metabolic markers. The Non-OC group were tested once in the mid-follicular phase (MFP) and once in the late luteal phase (LLP) of the MC, while the OC group performed their first test within 1 week of taking the OC (T1) and their second test 1 week later (T2). Despite performance time being the same in both groups [mean (SD), Non-OC group: 77.7 (14.9) s versus OC group: 77.7 (21.1)s], plasma ammonia concentration ([NH3]pl) was higher in the Non-OC group when compared to the OC group throughout recovery (P < 0.05). No differences were found in blood lactate (BLa), maximum heart rate or aural temperature (Tau) between groups. Within the Non-OC group Tau increased with exercise in both phases (P < 0.05), however Tau was higher in the LLP at rest [36.1 (0.3) degrees C) and 1 min post-exercise [37.1 (0.6) degrees C), when compared to the MFP [35.8 (0.3) and 36.9 (0.7) degrees C, rest and 1 min post-exercise respectively, P < 0.05]. Within the OC group T1 resulted in a higher peak BLa [11.2 (0.4) mmol/l] and [NH3]pl (143.0 (26.2) Umol/l] when compared to T2 [BLa, 9.6 (0.9); [NH3], 119.4 (48.1), P<0.05]. These results suggest that: (1) exercise performance does not vary between the MFP and the LLP of the MC, nor does it appear to be affected by the number of days using the OC, and (2) an altered metabolism occurs both between groups (Non-OC versus OC) and within the OC group. |
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Authors:
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N J Lynch; M A Nimmo |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: European journal of applied physiology and occupational physiology Volume: 78 ISSN: 0301-5548 ISO Abbreviation: Eur J Appl Physiol Occup Physiol Publication Date: 1998 Nov |
Date Detail:
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Created Date: 1999-01-29 Completed Date: 1999-01-29 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0410266 Medline TA: Eur J Appl Physiol Occup Physiol Country: GERMANY |
Other Details:
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Languages: eng Pagination: 565-72 Citation Subset: IM |
Affiliation:
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Scottish School of Sport Studies, University of Strathclyde, Glasgow, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Body Temperature / physiology Contraceptives, Oral / administration & dosage* Contraceptives, Oral, Combined / administration & dosage Contraceptives, Oral, Synthetic / administration & dosage Diet Energy Intake Energy Metabolism / physiology Ethinyl Estradiol / administration & dosage Ethinyl Estradiol-Norgestrel Combination / administration & dosage, analogs & derivatives Exercise Test / standards Female Follicular Phase / physiology* Humans Luteal Phase / physiology* Norpregnenes / administration & dosage Physical Exertion / drug effects*, physiology* Reproducibility of Results Running / physiology |
| Chemical | |
Reg. No./Substance:
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0/Contraceptives, Oral; 0/Contraceptives, Oral, Combined; 0/Contraceptives, Oral, Synthetic; 0/Norpregnenes; 109852-02-0/Femovan; 57-63-6/Ethinyl Estradiol; 79871-54-8/Cilest; 8056-51-7/Ethinyl Estradiol-Norgestrel Combination |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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