This study examined the effects of human pregnancy and advancing gestation on the intensity of respiratory discomfort (dyspnea) during cycle exercise. Fourteen pregnant women (PG) performed a progressive cycle ergometer exercise test involving 20 W/min increases in work rate to symptom limitation and/or a heart rate of 170-175 beats/min at 19.7+/-1.2 weeks (ENTRY), 28.2+/-0.3 weeks (TM2) and 36.3+/-0.3 weeks (TM3) gestation. Eight, age-matched, sedentary non-pregnant women (CG) were also studied for comparison purposes. Measurements included dyspnea intensity (Borg scale), minute ventilation (VE), breathing pattern and other cardiorespiratory parameters. At peak exercise, neither pregnancy nor advancing gestation had an effect on dyspnea, VE, breathing pattern, oxygen uptake or work rate (p>0.05). VE was significantly greater (by 11 L/min at 100 W) in the PG at TM3 versus CG (p<0.05) at all submaximal work rates. VE also increased progressively from ENTRY to TM2 and TM3 during submaximal exercise. Dyspnea was not significantly different at any submaximal work rate in the PG at TM3 versus CG or with advancing gestation in the PG. In addition, dyspnea at a standardized exercise VE of 40 L/min was not different at TM3 versus ENTRY or in the PG at TM3 versus CG. Neither pregnancy nor advancing gestation were associated with increased respiratory discomfort during strenuous non-weight bearing cycle ergometer exercise, despite substantial increases in VE and progressive mechanical adaptations of the respiratory system to accommodate the increasing size of the gravid uterus.

译文

这项研究检查了人类怀孕和妊娠对周期运动期间呼吸不适 (呼吸困难) 强度的影响。14名孕妇 (PG) 进行了渐进式循环测力计运动测试,包括在19.7周 +/-1.2周 (进入) 时,工作速率增加20 W/min,以达到症状限制和/或心率170-175次/min,28.2 +/-0.3周 (TM2) 和36.3 +/-0.3周 (TM3)。为了比较目的,还研究了八名年龄匹配的久坐不动的非孕妇 (CG)。测量包括呼吸困难强度 (Borg量表),分钟通气量 (VE),呼吸模式和其他心肺参数。在运动高峰时,怀孕和妊娠均不会影响呼吸困难,VE,呼吸方式,摄氧量或工作效率 (p>0.05)。在所有次最大工作速率下,TM3的PG相对于CG (p<0.05) 的VE显着更高 (在100 W下为11 l/min)。在次最大运动期间,VE也从进入TM2和TM3逐渐增加。在TM3相对于CG的PG中,在任何亚最大工作速率下,或在PG中进行妊娠时,呼吸困难均无显着差异。此外,在标准化运动VE为40 l/min时的呼吸困难在TM3与ENTRY或PG在TM3与CG时没有差异。尽管VE的显着增加和呼吸系统的进行性机械适应以适应妊娠子宫的增加,但在剧烈的非负重循环测力计运动中,怀孕和妊娠都不会增加呼吸不适。

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