Wenche Drøyvold B, Holmen Jostein, Krüger Øystein, Midthjell Kristian
Department of Community Medicine and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Verdal, Norway.
J Womens Health (Larchmt). 2004 Jan-Feb;13(1):55-62. doi: 10.1089/154099904322836456.
To study the association between self-reported leisure time physical activity at baseline (1984-1986) and change in body mass index (BMI) during an 11-year follow-up period (1995-1997). The study population was 9357 healthy women, aged 20-49 years, who had a normal body weight (BMI 18.5-24.9 kg/m2) at baseline.
A general population-based health survey was performed both in 1984-1986 (HUNT 1) and 1995-1997 (HUNT 2). Leisure time physical activity at HUNT 1 was categorized into high, moderate, and low levels based on self-reported intensity, duration, and frequency. Women who at baseline reported diabetes, stroke, angina, myocardial infarction, or long-term illnesses impairing their activities of living were excluded.
Physical activity was a significant predictor of BMI at HUNT 2 adjusted for BMI,age, and education at HUNT 1. Low level of leisure time physical activity compared with high level at baseline was significantly associated with a higher BMI 11 years later. Those with high level of activity gained 0.18 kg/m2 (95% CI 0.05, 0.32) less than those with low level of physical activity over 11 years.
This study has demonstrated that leisure time physical activity has a moderate effect on BMI. However, not even a high level of leisure time physical activity was sufficient to prevent weight gain and BMI increase in all subgroups of the study population.
研究基线期（1984 - 1986年）自我报告的休闲时间身体活动与11年随访期（1995 - 1997年）体重指数（BMI）变化之间的关联。研究人群为9357名年龄在20 - 49岁之间的健康女性，她们在基线期体重正常（BMI为18.5 - 24.9kg/m²）。
分别在1984 - 1986年（HUNT 1）和1995 - 1997年（HUNT 2）进行了基于一般人群的健康调查。根据自我报告的强度、持续时间和频率，将HUNT 1中的休闲时间身体活动分为高水平、中等水平和低水平。排除在基线期报告患有糖尿病、中风、心绞痛、心肌梗死或影响其日常生活活动的长期疾病的女性。
在根据HUNT 1时的BMI、年龄和教育程度进行调整后，身体活动是HUNT 2时BMI的显著预测因素。与基线期高水平相比，低水平的休闲时间身体活动与11年后较高的BMI显著相关。在11年期间，活动水平高的人群比身体活动水平低的人群体重增加少0.18kg/m²（95%CI 0.05，0.32）。
本研究表明休闲时间身体活动对BMI有中等程度的影响。然而，即使是高水平的休闲时间身体活动也不足以防止研究人群所有亚组的体重增加和BMI升高。
