Basterra-Gortari F Javier, Bes-Rastrollo Maira, Pardo-Fernández María, Forga Lluis, Martinez J Alfredo, Martínez-González Miguel A
Preventive Medicine and Public Health, University of Navarra, Clinica Universitaria, Pamplona, Spain.
Med Sci Sports Exerc. 2009 Mar;41(3):516-22. doi: 10.1249/MSS.0b013e318188607c.
To investigate the relationship between baseline leisure-time physical activity and changes in leisure activity during follow-up on long-term weight changes.
We evaluated prospectively 11,974 participants (university graduates) who participated in a dynamic cohort (Seguimiento Universidad de Navarra cohort) with an average follow-up of 27 months. Self-reported data from validated mailed questionnaires were used. Baseline leisure activity was assessed with a previously validated questionnaire.
After adjusting for age, hours sitting down, smoking status, snacking, fiber intake, and consumption of sugar-sweetened beverages, fast food, and alcohol, participants who decreased their leisure activity during follow-up experienced a significant increase in body mass index (BMI; relative change): for men, 0.9% (95% confidence interval [CI] = 0.5-1.2%); for women, 1.0% (95% CI = 0.6-1.3%). Participants who increased their leisure activity during follow-up experienced a significant reduction (relative change) in BMI: for men, -0.8% (95% CI = -1.1% to -0.5%); for women, -0.6% (95% CI = -0.9% to -0.4%). This inverse association between changes in leisure activity and weight gain was significantly stronger for participants with a baseline BMI >or=25 kg x m(-2), but the absolute magnitude of this interaction effect was trivial. Baseline physical activity was not significantly associated with weight changes after 2-yr of follow-up.
Longitudinal changes in leisure activity during follow-up were inversely associated with changes in body weight. The true relationships between leisure activity and body weight are likely to have been larger than observed, owing to attenuation of effects by measurement error in self-reported data.
研究基线休闲时间身体活动与随访期间休闲活动变化对长期体重变化的关系。
我们前瞻性地评估了11974名参与者（大学毕业生），他们参与了一个动态队列研究（纳瓦拉大学随访队列），平均随访时间为27个月。使用了经过验证的邮寄问卷中的自我报告数据。基线休闲活动通过先前验证的问卷进行评估。
在调整年龄、久坐时间、吸烟状况、吃零食、纤维摄入量以及含糖饮料、快餐和酒精的消费量后，随访期间休闲活动减少的参与者体重指数（BMI；相对变化）显著增加：男性为0.9%（95%置信区间[CI]=0.5 - 1.2%）；女性为1.0%（95% CI = 0.6 - 1.3%）。随访期间休闲活动增加的参与者BMI显著降低（相对变化）：男性为-0.8%（95% CI = -1.1%至-0.5%）；女性为-0.6%（95% CI = -0.9%至-0.4%）。对于基线BMI≥25 kg·m⁻²的参与者，休闲活动变化与体重增加之间的这种负相关显著更强，但这种交互作用的绝对幅度很小。随访2年后，基线身体活动与体重变化无显著关联。
随访期间休闲活动的纵向变化与体重变化呈负相关。由于自我报告数据中的测量误差导致效应减弱，休闲活动与体重之间的真实关系可能比观察到的更大。
