The Influence of Minimum Sitting Period of the ActivPALâ„¢ on the Measurement of Breaks in Sitting in Young Children
The Influence of Minimum Sitting Period of the ActivPALâ„¢ on the Measurement of Breaks in Sitting in Young Children
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DOI：
10.1371/journal.pone.0071854
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发表时间：
2013-08-14
期刊：
影响因子：
3.7
通讯作者：
Paton, James Y.
中科院分区：
文献类型：
--
作者：
Alghaeed, Zubaida;Reilly, John J.;Paton, James Y.
背景：久坐时间和久坐休息会影响心脏代谢健康。新的监测仪（例如 activPAL (TM)）对于坐姿时间和坐姿休息时间的测量可能更准确，尽管如何优化测量精度尚不清楚。一个重要的问题是定义新姿势的最短坐/直立时间 (MSUP)。使用 activPAL (TM)，我们研究了 MSUP 变化对总坐姿时间和坐姿休息时间的影响，并确定了两种结构的不同 activPAL (TM) 设置的标准有效性。方法：我们对 23 名佩戴 activPAL (TM)（24 小时/天）5-7 天的儿童（平均 (SD) 年龄 4.5 岁 (0.7)）改变了 MSUP 设置。我们首先使用默认设置 10 s MSUP 研究 activPAL (TM)，然后将其减少到 5 s、2 s 和 1 s。在第二项研究中，我们以 30 名学龄前儿童（平均年龄 4.1 岁 (SD 0.5)）为样本，根据直接观察验证了不同 MSUP 设置下的 activPAL (TM) 坐姿时间和坐姿休息时间测量。结果：比较 10、5、2 和 1 秒的设置，坐姿时间没有显着差异（6.2 小时 (1.0)、6.3 小时 (1.0)、设置之间分别为 6.4 小时 (1.0) 和 6.3 小时 (1.6))，但在 10、5、2 和 1 秒设置下，表观中断次数分别显着增加 - (8(3)、14(2)、21(4) 和 28(6)/h)。与直接观察相比，2 秒设置相对于直接观察误差最小（95% 一致性限度：-14 至 +17 次坐次/小时，平均差 1.83，p = 0.2）。结论：使用 activPAL (TM)，坐间休息时间（而非总坐时间）对 MSUP 设置高度敏感，2 秒对于幼儿来说是最佳设置。如果要获得坐姿休息次数的准确测量值，则需要凭经验确定定义新姿势的 MSUP。
Background: Sitting time and breaks in sitting influence cardio-metabolic health. New monitors (e. g. activPAL (TM)) may be more accurate for measurement of sitting time and breaks in sitting although how to optimize measurement accuracy is not yet clear. One important issue is the minimum sitting/upright period (MSUP) to define a new posture. Using the activPAL (TM), we investigated the effect of variations in MSUP on total sitting time and breaks in sitting, and also determined the criterion validity of different activPAL (TM) settings for both constructs.Methods: We varied setting of MSUP in 23 children (mean (SD) age 4.5 y (0.7)) who wore activPAL (TM) (24 hr/d) for 5-7 d. We first studied activPAL (TM) using the default setting of 10 s MSUP and then reduced this to 5 s, 2 s and 1 s. In a second study, in a convenience sample of 30 pre-school children (mean age 4.1 y (SD 0.5)) we validated the activPAL (TM) measures of sitting time and breaks in sitting at different MSUP settings against direct observation.Results: Comparing settings of 10, 5, 2 and 1 s, there were no significant differences in sitting time (6.2 hr (1.0), 6.3 hr (1.0), 6.4 hr (1.0) and 6.3 hr (1.6), respectively) between settings but there were significant increases in the apparent number of breaks - (8(3), 14(2), 21(4) and 28 (6)/h) at 10, 5, 2 and 1 s settings, respectively. In comparison with direct observation, a 2 s setting had the smallest error relative to direct observation (95% limits of agreement: -14 to +17 sitting bouts/hr, mean difference 1.83, p = 0.2).Conclusion: With activPAL (TM), breaks in sitting, but not total sitting time, are highly sensitive to the setting of MSUP, with 2 s optimal for young children. The MSUP to define a new posture will need to be empirically determined if accurate measurements of number of breaks in sitting are to be obtained.