Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Lees Campus, 518E, 200 Lees Ave, Ottawa, ON, K1N 6N5, Canada.
Sports Studies Department, Faculty of Arts and Science, Bishop's University, Sherbrooke, QC, Canada.
Pflugers Arch. 2024 May;476(5):769-778. doi: 10.1007/s00424-024-02929-w. Epub 2024 Mar 4.
Studies have reported enhanced thermoregulatory function as pregnancy progresses; however, it is unclear if differences in thermoregulation are attributed to weight gain or other physiological changes. This study aimed to determine if total body weight will influence thermoregulation (heat production (H)), heart rate, and perceptual measurements in response to weight-bearing exercise during early to late pregnancy. A cross-sectional design of healthy pregnant women at different pregnancy time points (early, T1; middle, T2; late, T3) performed a 7-stage weight-bearing incremental exercise protocol. Measurements of H, HR, and RPE were examined. Two experimental groups were studied: (1) weight matched and (2) non-weight matched, in T1, T2, and T3. During exercise, equivalent H at T1 (326 ± 88 kJ), T2 (330 ± 43 kJ), and T3 (352 ± 52 kJ) (p = 0.504); HR (p = 0.830); and RPE (p = 0.195) were observed in the WM group at each time point. In the NWM group, H (from stages 1-6 of the exercise) increased across pregnancy time points, T1 (291 ± 76 kJ) to T2 (347 ± 41 kJ) and T3 (385 ± 47 kJ) (p < 0.001). HR increased from T1 to T3 in the warm-up to stage 6 (p = 0.009). RPE did not change as pregnancy time point progressed (p = 0.309). Total body weight, irrespective of pregnancy time point, modulates H and HR during exercise. Therefore, accounting for total body weight is crucial when comparing thermoregulatory function during exercise across pregnancy.
研究表明，随着妊娠的进展，体温调节功能增强；然而，目前尚不清楚体温调节的差异是归因于体重增加还是其他生理变化。本研究旨在确定总体重是否会影响妊娠早期至晚期负重运动时的体温调节（产热（H））、心率和知觉测量。采用健康孕妇不同妊娠时间点（早期，T1；中期，T2；晚期，T3）的横截面设计，进行 7 阶段负重递增运动方案。检查了 H、HR 和 RPE 的测量值。研究了两个实验组：（1）体重匹配组和（2）非体重匹配组，在 T1、T2 和 T3 中进行。在运动过程中，WM 组在 T1（326±88 kJ）、T2（330±43 kJ）和 T3（352±52 kJ）时观察到等效的 H（p=0.504）；HR（p=0.830）；在每个时间点的 RPE（p=0.195）。在 NWM 组中，随着妊娠时间点的推移，H（从运动的第 1-6 阶段）增加，T1（291±76 kJ）至 T2（347±41 kJ）和 T3（385±47 kJ）（p<0.001）。HR 在热身至第 6 阶段时从 T1 增加到 T3（p=0.009）。随着妊娠时间点的进展，RPE 没有变化（p=0.309）。无论妊娠时间点如何，总体重都会调节运动期间的 H 和 HR。因此，在比较整个怀孕期间运动时的体温调节功能时，考虑总体重至关重要。
