Low physical activity and mortality in women: Baseline lifestyle and health as alternative explanations

被引:37
作者
Carlsson, Sofia
Andersson, Tomas
Wolk, Alicja
Ahlbom, Anders
机构
[1] Karolinska Inst, Div Epidemiol & Social Med, Stockholm Ctr Publ Hlth, Stockholm, Sweden
[2] Karolinska Inst, Dept Epidemiol, Inst Environm Med, Stockholm, Sweden
[3] Karolinska Inst, Dept Nutr Epidemiol, Inst Environm Med, Stockholm, Sweden
关键词
bias; confounding; epidemiology; physical activity; women;
D O I
10.1080/14034940600551293
中图分类号
R1 [预防医学、卫生学];
学科分类号
1004 [公共卫生与预防医学]; 120402 [社会医学与卫生事业管理];
摘要
Aims: The aim of this study was to investigate the association between physical activity and mortality in post-menopausal women. In addition, the authors wanted to investigate to what extent this association could be attributed to confounding from other lifestyle factors, and to reverse causation due to a number of common health problems that may inhibit the ability to exercise. Methods: A total of 27,734 women aged 51-83 years from the Swedish Mammography Cohort were investigated. In 1997 they responded to a detailed questionnaire including questions on physical activity, diet, alcohol intake, smoking, and medical problems. During follow-up in 1999-2004, 1,232 deaths were identified by linkage to the National Population Register. Results: Women with low physical activity (<= 35 MET*h/day) had a 3.22 times increased mortality (95% confidence interval (CI)=2.35-4.43) compared with the most active women (> 50 MET*h/day). No increased risk was seen in women with moderate compared with high physical activity. Sedentary women tended to have a less healthy lifestyle and more health problems at baseline, e. g. almost 30% of them reported high blood pressure compared with less than 20% of active women. Baseline medical problems and lifestyle factors such as smoking, diet, and education accounted for 30% of the excess risk seen in sedentary women (24% and 6% respectively). Conclusions: This study indicates that even fairly small amounts of activity will reduce mortality in older women. However, sedentary women seemed to be a selected group with more medical problems and a less healthy lifestyle. The findings indicate that the association between physical inactivity and mortality will be overestimated if this is not taken into account.
引用
收藏
页码:480 / 487
页数:8
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