Reallocating Time to Sleep, Sedentary Time, or Physical Activity: Associations with Waist Circumference and Body Mass Index in Breast Cancer Survivors.
Reallocating Time to Sleep, Sedentary Time, or Physical Activity: Associations with Waist Circumference and Body Mass Index in Breast Cancer Survivors.
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DOI：
10.1158/1055-9965.epi-16-0545
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发表时间：
2017-02
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影响因子：
--
通讯作者：
Lynch BM
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文献类型：
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作者：
Boyle T;Vallance JK;Buman MP;Lynch BM
在乳腺癌幸存者中，中等强度到剧烈强度的体力活动（MVPA）与腰围和体重指数呈负相关。有限的研究集中在占一天大部分时间的行为上[睡眠，久坐时间和轻强度体力活动（LPA）]。在这项研究中，我们调查了乳腺癌幸存者自我报告的睡眠、客观评估的长时间和短时间久坐、总LPA和总MVPA与腰围和BMI的相互依赖关系。乳腺癌幸存者的横截面样本（N=256，平均年龄=60岁;自诊断以来的平均时间=3年）在清醒时间内佩戴Actigraph® GT 3X+加速计7天。参与者还完成了匹兹堡睡眠质量指数，并自我报告了他们的腰围，身高和体重。在调整潜在混杂因素后，在线性回归模型中使用等时替代方法来探索重新分配睡眠时间、久坐和活动行为对腰围和BMI的相关性。将30分钟重新分配到总MVPA与较低的腰围相关，当从睡眠（− 2.50 cm，95% CI = − 4.45 cm，− 0.56 cm），久坐时间延长（− 2.51 cm，95% CI = − 4.38 cm，− 0.64 cm）或LPA（− 2.71 cm，95% CI = − 4.72 cm，− 0.69 cm）分配时。将30分钟的久坐时间重新分配到非久坐时间与腰围较低相关（-0.94cm，95%CI =-1.79cm，-0.10cm）。BMI也观察到类似的结果。增加MVPA水平和减少长时间持续久坐的时间可能是改善这一人群身体成分的途径。
Moderate-to-vigorous intensity physical activity (MVPA) has been inversely associated with waist circumference and body mass index among breast cancer survivors. Limited research has focused on behaviours that account for larger portions of the day [sleep, sedentary time, and light-intensity physical activity (LPA)]. In this study we investigated the interdependent associations of self-reported sleep, objectively-assessed prolonged and short bouts of sedentary time, total LPA and total MVPA with waist circumference and BMI in breast cancer survivors. A cross-sectional sample of breast cancer survivors (N=256, mean age=60 years; mean time since diagnosis=3 years) wore an Actigraph® GT3X+ accelerometer during waking hours for seven days. Participants also completed the Pittsburgh Sleep Quality Index, and self-reported their waist circumference, height and weight. An isotemporal substitution approach was used in linear regression models to explore the associations of reallocating time to sleep, sedentary and active behaviours on waist circumference and BMI, after adjusting for potential confounders. Reallocating 30 minutes to total MVPA was associated with lower waist circumference when allocated from sleep (−2.50cm, 95% CI = −4.45cm, −0.56cm), prolonged sedentary time (−2.51cm, 95% CI = −4.38cm, −0.64cm) or LPA (−2.71cm, 95% CI = −4.72cm, −0.69cm). Reallocating 30 minutes of prolonged sedentary time to non-prolonged sedentary time was associated with lower waist circumference (−0.94cm, 95% CI = −1.79cm, −0.10cm). Similar results were observed for BMI. Increasing MVPA levels and decreasing time spent in prolonged, unbroken sedentary bouts may be avenues for improving body composition in this population.