Intra-individual and inter-individual variability in daily sitting time and MVPA
Intra-individual and inter-individual variability in daily sitting time and MVPA
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DOI：
10.1016/j.jsams.2015.05.004
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发表时间：
2016-06-01
影响因子：
4
通讯作者：
Zderic, Theodore W.
中科院分区：
文献类型：
--
作者：
Barreira, Tiago V.;Hamilton, Marc T.;Zderic, Theodore W.
目的：人们对个体自由生活坐着时间的可变性知之甚少。本研究的目的是检查客观确定的每日坐着时间的个体内部变异性，并确定这种变异性是否与每周平均坐着时间或推荐的中等强度体力活动（MVPA）有关。也。这项研究确定了自由生活坐姿和MVPA时间的可靠性，因为它有助于指导研究人员确定需要多少天的监测。设计：68名女性（52±8岁）连续佩戴活动pal监护仪7天。方法：计算个体内每日久坐时间范围。通用性理论分析确定了日坐的可靠性和推荐的MVPA。结果：平均久坐时间为9.0 +/- 1.8 h/d，周平均4.5 +/- 1.7 h/d。同样，最低四分位数（6.7 +/- 0.8）和最高四分位数（11.3 +/- 1.1小时/天）的平均坐着时间也有4.5小时/天的差异。个体内每天坐着的时间范围在坐着时间的四分位数之间（即，第1 -4四分位数为4.9 +/- 1.9、4.1 +/- 1.9、5.1 +/- 1.5、3.9 +/- 1.1小时/天）和MVPA的四分位数之间（即，第1 -4四分位数为4.2 +/- 1.8、4.7 +/- 2.0、4.6 +/- 1.5、4.4 +/- 1.3小时/天）没有差异。客观测量静坐时间为4天，MVPA为7天，信度系数为0.80。结论：研究结果表明，由于每天坐着的时间变化很大（一周内每天4.5小时），无论每周平均坐着的时间和定期锻炼的时间如何，久坐的时间都可能相对较长。(C) 2015澳大利亚运动医学。Elsevier Ltd.出版。版权所有。
Objectives: Little is known about how much variability exists in free-living sitting time within individuals. The purpose of this study was to examine intra-individual variability of objectively determined daily sitting time and to determine if this variability was related to weekly averages of sitting duration or recommended moderate-vigorous physical activity (MVPA). Also., this study determined the reliability of free-living sitting and MVPA time as it useful for guiding researchers in determining how many days of monitoring are needed.Design: An activPAL monitor was worn for 7 consecutive days by 68 women (52 +/- 8 years).Methods: Intra-individual range of daily sitting time was calculated. Generalizability theory analysis determined the reliability of daily sitting and recommended MVPA.Results: Mean sitting time was 9.0 +/- 1.8 h/day and the within individual weekly mean range was 4.5 +/- 1.7 h/day. Similarly, there was a 4.5 h/day difference in sitting time between the mean of the lowest sitting (6.7 +/- 0.8) and highest sitting (11.3 +/- 1.1 h/day) quartiles. The intra-individual range in daily sitting did not differ among quartiles of sitting time (i.e., 4.9 +/- 1.9, 4.1 +/- 1.9, 5.1 +/- 1.5, 3.9 +/- 1.1 h/day for the 1st-4th quartiles) nor among quartiles of MVPA (i.e., 4.2 +/- 1.8, 4.7 +/- 2.0, 4.6 +/- 1.5, 4.4 +/- 1.3 h/day for the I st-4th quartiles. A reliability coefficient of 0.80 was achieved with 4 days of objectively measured sitting time and 7 days for MVPA.Conclusions: The findings suggest exposure to relatively high levels of sedentary time may occur in people regardless of weekly averages in sitting and regular exercise due to the high day-to-day variation in daily sitting time (4.5 h/d range within a week). (C) 2015 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.