Jefferis Barbara J, Sartini Claudio, Ash Sarah, Lennon Lucy T, Wannamethee S Goya, Whincup Peter H
UCL Department of Primary Care & Population Health, UCL Medical School, Rowland Hill Street, London, NW3 2PF, UK.
UCL Physical Activity Research Group, University College London, London, UK.
Int J Behav Nutr Phys Act. 2016 Feb 4;13:14. doi: 10.1186/s12966-016-0338-1.
Older adults are the most inactive age group and self-reporting of activities may be complicated by age-related reductions in structured activities and misclassification or recall biases. We investigate the validity of simple questionnaires about sedentary behaviour (SB), (including the widely used proxy television (TV) viewing), and physical activity (PA) in comparison with objective measures.
Community dwelling men aged 71-93 years, from a UK population-based cohort wore a GT3X accelerometer over the right hip for 7 days and self-completed a questionnaire including information about SB (TV, reading, computer use and car use) and PA (leisure and sporting domains).
1566/3137 surviving men (mean age 79 years) attended. 1377 ambulatory men provided questionnaire and accelerometer data. Questionnaires under-estimated mean daily sedentary time; 317 minutes total SB (TV, computer use, reading or driving), 176 minutes (TV) vs 619 minutes (objectively measured). Correlations between objective measures and self-reports were 0.18 (total SB) and 0.17 (TV), both P < 0.001. Objective SB levels were similar across the lowest three quartiles of self-reported SB but raised in the highest quartile. Correlations between steps/day or moderate to vigorous PA with self-reported total PA were both 0.49, P < 0.001 and measured PA levels were progressively higher at higher levels of self-reported PA.
Among older men, simple SB questions performed poorly for identifying total SB time, although simple PA questions were associated with a graded increase with objectively measured PA. Future studies of health effects of SB in older men would benefit from objective measures of SB.
老年人是最缺乏运动的年龄组，由于与年龄相关的结构化活动减少以及错误分类或回忆偏差，活动的自我报告可能会变得复杂。我们将关于久坐行为（SB）（包括广泛使用的替代指标看电视（TV））和身体活动（PA）的简单问卷与客观测量方法进行比较，以调查其有效性。
来自英国基于人群队列的71 - 93岁社区居住男性，在右髋部佩戴GT3X加速度计7天，并自行完成一份问卷，其中包括关于SB（看电视、阅读、使用电脑和乘车）和PA（休闲和体育领域）的信息。
1566/3137名存活男性（平均年龄79岁）参加。1377名能走动的男性提供了问卷和加速度计数据。问卷低估了平均每日久坐时间；总SB时间为317分钟（看电视、使用电脑、阅读或开车），看电视为176分钟，而客观测量为619分钟。客观测量与自我报告之间的相关性分别为0.18（总SB）和0.17（看电视），均P < 0.001。在自我报告的SB最低的三个四分位数中，客观SB水平相似，但在最高四分位数中升高。每日步数或中度至剧烈PA与自我报告的总PA之间的相关性均为0.49，P < 0.001，并且在自我报告的PA水平较高时，测量的PA水平逐渐升高。
在老年男性中，简单的SB问题在识别总SB时间方面表现不佳，尽管简单的PA问题与客观测量的PA分级增加相关。未来关于老年男性SB对健康影响的研究将受益于SB的客观测量。
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