We sought to examine the levels, types, and changes of physical activity and their correlates among pregnant women. Data came from 9,889 pregnant women with due dates between April 1, 1991 and December 31, 1992 who were participants of the Avon Longitudinal Study of Parents and Children (ALSPAC) in Bristol, Avon, Southwest England. Self-reported physical activity during pregnancy was collected via questionnaires administered at 18 and 32 weeks of gestation. We found, at 18 weeks of gestation, the prevalence of engaging in physical activity that was sufficient to cause sweating for ≥ 3 h/week (referred to as strenuous physical activity) was 48.8%. This percentage was similar at 32 weeks of gestation. The most common physical activity during pregnancy reported by these women was brisk walking, followed by swimming and ante-natal exercise. In models that mutually adjusted for all characteristics examined, younger women, women in lower social classes, those not employed during pregnancy, married and parous women (compared to those not in each of these groups) were more likely to report engaging in strenuous physical activity. After becoming pregnant, about two out of three of these women reported reducing physical activity levels at 18 weeks of gestation. In mutually adjusted models, women who were younger, fit and well, parous, and women from lower social classes (compared to those not in each of these groups) were less likely to report reducing their physical activity. Our findings provide insights that are relevant to the design of future observational and intervention studies concerned with the effects of physical activity during pregnancy on health outcomes for mothers and offspring.

中文翻译：

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前瞻性英国女性队列中的怀孕期间身体活动：雅芳对父母和孩子的纵向研究的结果。

我们试图检查孕妇体力活动的水平、类型和变化及其相关性。数据来自于 1991 年 4 月 1 日至 1992 年 12 月 31 日期间到期的 9,889 名孕妇，她们是英格兰西南部雅芳布里斯托尔的雅芳父母和儿童纵向研究 (ALSPAC) 的参与者。通过在妊娠 18 周和 32 周时进行的问卷调查收集怀孕期间自我报告的身体活动。我们发现，在妊娠 18 周时，每周进行足以导致 ≥ 3 小时出汗的体力活动（称为剧烈体力活动）的发生率为 48.8%。这个百分比在妊娠 32 周时相似。这些妇女报告的怀孕期间最常见的身体活动是快走，其次是游泳和产前运动。在针对所检查的所有特征相互调整的模型中，年轻女性、较低社会阶层的女性、怀孕期间未就业的女性、已婚和经产女性（与不在这些群体中的女性相比）更有可能报告从事剧烈的体育活动. 怀孕后，这些女性中约有三分之二报告称在妊娠 18 周时减少了身体活动水平。在相互调整的模型中，较年轻、身体健康、经产的女性和社会较低阶层的女性（与不在这些群体中的女性相比）报告减少身体活动的可能性较小。