Thermoregulatory and metabolic responses to jogging prior to and during pregnancy

Clapp, James F.; Wesley, Mary; Sleamaker, Robert H.

doi:10.1249/00005768-198704000-00010

Cited by 67 publications

(14 citation statements)

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“…Irrespective of exercise mode, intensity or duration, or type of heat exposure, no study reported any participant exceeding a core temperature above the recommended maternal threshold of 39.0°C, with 38.9°C the highest individual core temperature reported 25. The study inducing the highest H prod (1195 W; 30 min running by aerobically fit pregnant participants at 80%–90% of HR max ) observed mean end-exercise core temperatures of 38.3°C (95% CI 37.7°C to 38.9°C39; figure 2).…”

Section: Resultsmentioning

confidence: 99%

Heat stress and fetal risk. Environmental limits for exercise and passive heat stress during pregnancy: a systematic review with best evidence synthesis

Ravanelli

Casasola²,

English

et al. 2018

Br J Sports Med

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ObjectivePregnant women are advised to avoid heat stress (eg, excessive exercise and/or heat exposure) due to the risk of teratogenicity associated with maternal hyperthermia; defined as a core temperature (Tcore) ≥39.0°C. However, guidelines are ambiguous in terms of critical combinations of climate and activity to avoid and may therefore unnecessarily discourage physical activity during pregnancy. Thus, the primary aim was to assess Tcore elevations with different characteristics defining exercise and passive heat stress (intensity, mode, ambient conditions, duration) during pregnancy relative to the critical maternal Tcore of ≥39.0°C.DesignSystematic review with best evidence synthesis.Data sourcesEMBASE, MEDLINE, SCOPUS, CINAHL and Web of Science were searched from inception to 12 July 2017.Study eligibility criteriaStudies reporting the Tcore response of pregnant women, at any period of gestation, to exercise or passive heat stress, were included.Results12 studies satisfied our inclusion criteria (n=347). No woman exceeded a Tcore of 39.0°C. The highest Tcore was 38.9°C, reported during land-based exercise. The highest mean end-trial Tcore was 38.3°C (95% CI 37.7°C to 38.9°C) for land-based exercise, 37.5°C (95% CI 37.3°C to 37.7°C) for water immersion exercise, 36.9°C (95% CI 36.8°C to 37.0°C) for hot water bathing and 37.6°C (95% CI 37.5°C to 37.7°C) for sauna exposure.ConclusionThe highest individual core temperature reported was 38.9°C. Immediately after exercise (either land based or water immersion), the highest mean core temperature was 38.3°C; 0.7°C below the proposed teratogenic threshold. Pregnant women can safely engage in: (1) exercise for up to 35 min at 80%–90% of their maximum heart rate in 25°C and 45% relative humidity (RH); (2) water immersion (≤33.4°C) exercise for up to 45 min; and (3) sitting in hot baths (40°C) or hot/dry saunas (70°C; 15% RH) for up to 20 min, irrespective of pregnancy stage, without reaching a core temperature exceeding the teratogenic threshold.

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Section: Resultsmentioning

confidence: 99%

Heat stress and fetal risk. Environmental limits for exercise and passive heat stress during pregnancy: a systematic review with best evidence synthesis

Ravanelli

Casasola²,

English

et al. 2018

Br J Sports Med

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“…However, as exercise intensity increases, reliance on glucose metabolism also increases and in pregnancy circulating glucose concentration may decline by up to 31% with increasing intensities. 6,[12][13][14][15][16][17] Less is known about the impact of duration of exercise on glucose metabolism in pregnancy. In nonpregnant females, circulating glucose initially declines in the first 20 minutes of exercise, followed by a return to preexercise levels with longer duration exercise as a result of liver glycogen breakdown/release or glycogenolysis.…”

Section: Hormone and Substrate Adaptations To Prenatal Exercisementioning

confidence: 99%

Maternal Responses to Aerobic Exercise in Pregnancy

Davenport

Skow

Steinback

2016

Clinical Obstetrics &Amp; Gynecology

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Exercise is one of the most physiologically challenging stressors requiring the coordination of metabolic, respiratory, and cardiovascular responses to meet increased energy requirements of the working muscle. During pregnancy, all women without contraindication are encouraged to exercise as part of a healthy lifestyle. Pregnancy itself is associated with profound physiological adaptations to the maternal cardiovascular, respiratory, and metabolic systems, which serve to support the needs of the growing fetus. Therefore the physiological adaptations to exercise during pregnancy are more pronounced and critically important. This review provides an overview of our current understanding of the physiological adaptations to acute prenatal exercise.

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“…Several animal experiments have given support to these hypotheses, 6,7,9,14 while human studies are less conclusive. 8,[10][11][12]15,16 Only few studies have specifically addressed the association between exercise during pregnancy and miscarriage. In the existing body of literature, exercise during pregnancy has generally not been associated with miscarriage, [17][18][19] and one case-control study has even reported a protective effect of exercise during pregnancy.…”

Section: Introductionmentioning

confidence: 99%

Leisure time physical exercise during pregnancy and the risk of miscarriage: a study within the Danish National Birth Cohort

Madsen

Jørgensen

Jensen

et al. 2011

Journal of Reproductive Immunology

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Thermoregulatory and metabolic responses to jogging prior to and during pregnancy

Cited by 67 publications

References 0 publications

Heat stress and fetal risk. Environmental limits for exercise and passive heat stress during pregnancy: a systematic review with best evidence synthesis

Heat stress and fetal risk. Environmental limits for exercise and passive heat stress during pregnancy: a systematic review with best evidence synthesis

Maternal Responses to Aerobic Exercise in Pregnancy

Leisure time physical exercise during pregnancy and the risk of miscarriage: a study within the Danish National Birth Cohort

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