Hatch M, Levin B, Shu X O, Susser M
Columbia School of Public Health, New York, NY, USA.
Am J Public Health. 1998 Oct;88(10):1528-33. doi: 10.2105/ajph.88.10.1528.
This study investigated whether, in a general obstetric population, exercise in pregnancy affects the timeliness of delivery. The hypothesis was that maternal exercise would not raise the risk of preterm birth.
A community cohort of 557 prenatal patients was followed up until the time of delivery. Data were collected on exercise in each trimester: none, low-moderate (< 1000 kcal [4184 kJ]/wk in energy expenditure), or heavy (> or = 1000 kcal/wk). Timely delivery was adopted as an outcome criterion. Thus, in the analysis, a term birth was treated as optimal and survival techniques were used to estimate risks for both preterm and postdates delivery.
No association was found between low-moderate exercise and gestational length. Heavier exercise appeared to reduce, rather than raise, the risk of preterm birth. The adjusted relative risk among conditioned heavy exercisers was 0.11 (95% confidence interval = 0.02, 0.81). After term, conditioned heavy exercisers delivered faster than nonexercisers.
The most important finding was the lack of evidence that vigorous maternal exercise is a risk factor for preterm delivery. A promising finding was that conditioned heavy exercisers have timely deliveries.
本研究调查了在普通产科人群中，孕期运动是否会影响分娩的及时性。假设是孕妇运动不会增加早产风险。
对557名产前患者的社区队列进行随访直至分娩。收集了每个孕期的运动数据：无运动、低 - 中度运动（能量消耗<1000千卡[4184千焦]/周）或高强度运动（≥1000千卡/周）。采用及时分娩作为结果标准。因此，在分析中，足月分娩被视为最佳情况，并使用生存技术来估计早产和过期产的风险。
未发现低 - 中度运动与孕期长短之间存在关联。高强度运动似乎降低而非增加早产风险。经调整后，高强度运动者的相对风险为0.11（95%置信区间 = 0.02, 0.81）。足月后，高强度运动者比不运动者分娩更快。
最重要的发现是缺乏证据表明孕妇剧烈运动是早产的危险因素。一个有前景的发现是高强度运动者能够及时分娩。
