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Cited by 68Thermoregulation and physiological responsesCardiovascular and exercise physiologyExercise and Physiological Responses

Thermoregulation during exercise in women who are taking oral contraceptives

Rogers, S. M., Baker, M. A.·1996·European Journal of Applied Physiology
DOI 10.1007/s004210050123
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Abstract

Thermoregulation during exercise was studied in seven women who were taking oral contraceptive pills for 3 weeks of each month. The subjects were studied once in the 3rd week of taking the pill (P) and once during the following week when they took no pil (N). Rectal temperature (Tre), heart rate (fc) and evaporative water loss (EWL, ventilated capsule technique) were measured while they walked on a treadmill for 60 min at 4.8 km.h-1 at a 10% gradient. Ambient temperature was 22 degrees C. A venous blood sample was drawn 30 min before each experiment for measurement of hematocrit (packed cell volume, PCV), plasma osmolality (Osmpl), and plasma levels of the endogenous pyrogens interleukin-1 beta (IL-1 beta) and interleukin-6 (IL-6). Resting Tre was 0.31 degree C higher in P than in N (P < 0.01) and Tre remained higher in P throughout the entire exercise period (P < 0.01). Threshold Tre for the onset of EWL was 0.32 degree C higher in P than in N (P < 0.01). Exercise fc was 6.5 beats.min-1 higher in P than in N (P < 0.01). There was no significant difference in PCV, Osmpl, IL-1 beta or IL-6 between P and N. It was concluded that the administration of synthetic progestins in oral contraceptives causes an upward shift in the threshold for heat loss responses, resulting in higher body core temperatures both at rest and during exercise. There was no evidence that these alterations in thermoregulation were mediated by changes in body fluid balance or in plasma levels of IL-1 beta or IL-6.

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  • Women taking oral contraceptives containing an estrogen and progestin (active phase) have elevated core body temperatures while awake at rest compared with the placebo phase.

    “Studies of women taking oral contraceptives containing an estrogen and progestin (active phase) have shown they have elevated core body temperatures while awake at rest compared with the placebo phase [105,106].”

    From Temperature regulation in women: Effects of the menstrual cycle (2020) · cites this paper as [106]

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Authors
Rogers, S. M., & Baker, M. A.
Affiliations
University of California, Riverside (US)
Venue
European Journal of Applied Physiology
Publisher
Springer Science and Business Media LLC
Published
1996-12-01
Volume
75
Issue
1
Pages
34-38
ISSN
  • 0020-9376 (ISSN-L)
  • 1439-6319
  • 1439-6327
DOI
10.1007/s004210050123
OpenAlex
W2029647676
Cited by
68
References
24
Citations by year
2026: 2 · 2024: 2 · 2023: 3 · 2021: 2 · 2020: 5 · 2019: 2 · 2018: 2 · 2017: 1 · 2016: 2 · 2015: 5 · 2014: 2 · 2013: 4
FWCI
2.02
Type
journal article
Language
en
Open access
closed
Licence
www.springer.com/tdm (tdm)
Locations
  • European Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
thermoregulation, exercise thermoregulation, oral contraceptives, synthetic progestins, core body temperature, rectal temperature, evaporative water loss, heart rate, IL-1β, interleukin-6, plasma osmolality, hematocrit, women
MeSH terms
Adult, Body Temperature, Body Temperature Regulation, Contraceptives, Oral, Female, Heart Rate, Hematocrit, Humans, Interleukin-1, Osmolar Concentration, Sweating, Exercise, Interleukin-6

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