Response of women using oral contraception to exercise in the heat

Minahan, Clare and Melnikoff, Marina and Quinn, Karlee and Larsen, Brianna (2017) Response of women using oral contraception to exercise in the heat. European Journal of Applied Physiology, 117. pp. 1383-1391. ISSN 1439-6319


Abstract

Purpose
To compare the response of long-term oral contraceptive users (WomenOC; n = 8) to naturally menstruating women (WomenNM; n = 8) at rest and during exercise in temperate (TEMP; 22 °C) and hot (HEAT; 35 °C) conditions.

Methods
Participants performed a three-stage cycling trial in each condition at 90, 135, and 180% of lactate threshold 1 (total = 52.5 min). Heart rate (HR) and core temperature (T c) were recorded continuously, whereas blood pressure (BP), ratings of perceived exertion (RPE), blood lactate [La−], and skin blood flow (BFsk) were recorded every 7.5 min.

Results
Baseline T c was higher in WomenOC (37.5 ± 0.2, 37.6 ± 0.3 °C) than WomenNM (37.2 ± 0.2, 37.0 ± 0.4 °C) before the TEMP (p = 0.03) and HEAT (p < 0.01) trials, respectively. This difference remained for 22.5 min into both trials (p ≤ 0.05), after which time no between-group differences were found (p > 0.05). BFsk measured in WomenNM plateaued from 7.5 min in the HEAT, whereas BFsk measured in WomenOC increased for 15.0 min (p = 0.02) before plateauing. There were no between-group differences in HR, BP, or blood [La−] before or throughout either trial (p > 0.05). WomenOC had higher (p ≤ 0.04) RPE values than WomenNM in the HEAT, reporting 8 ± 1 and 6 ± 2 at the end of Stage 3, respectively.

Conclusions
WomenOC concluded both trials with a comparable T c to WomenNM, but had a prolonged BFsk response and elevated RPE in the HEAT. Changes to BFsk and RPE observed in women using OC may have implications for exercise tolerance in hot conditions.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Health and Wellbeing (1 Jan 2015 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Health and Wellbeing (1 Jan 2015 -)
Date Deposited: 16 Sep 2020 22:37
Last Modified: 24 Sep 2020 06:15
Uncontrolled Keywords: Skin blood flow; Core temperature; Thermoregulation; Perceived exertion; Performance; Ovarian hormones
Fields of Research (2008): 11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110602 Exercise Physiology
11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110604 Sports Medicine
Fields of Research (2020): 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420702 Exercise physiology
32 BIOMEDICAL AND CLINICAL SCIENCES > 3202 Clinical sciences > 320225 Sports medicine
Socio-Economic Objectives (2008): C Society > 92 Health > 9205 Specific Population Health (excl. Indigenous Health) > 920507 Women's Health
Identification Number or DOI: https://doi.org/10.1007/s00421-017-3628-7
URI: http://eprints.usq.edu.au/id/eprint/39584

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