Sasaki Jeffer Eidi, Júnior Jairo Hélio, Meneguci Joilson, Tribess Sheilla, Marocolo Júnior Moacir, Stabelini Neto Antonio, Virtuoso Júnior Jair Sindra
a Graduate Program in Physical Education , Federal University of Triangulo Mineiro , Uberaba , Brazil.
b Federal Institute Goiano , Urutaí , Brazil.
J Sports Sci. 2018 Jul;36(14):1572-1577. doi: 10.1080/02640414.2017.1403527. Epub 2017 Nov 10.
The purpose of the study was to examine the minimum number of monitoring days for reliably estimating physical activity (PA) and sedentary behaviour (SB) from accelerometer data in older adults. Forty-two older adults from a local senior centre participated in this study. Participants wore an ActiGraph wGT3X-BT on the right hip for 7 consecutive days. Accelerometer data were downloaded to a computer and converted to activity count data in 60s epochs. Time spent in SB and different PA intensity categories were estimated with commonly used activity count cut-points. Participants with at least 7 valid days of monitoring (≥10 hday) were included in the analysis. Intraclass correlation coefficients (ICC) were calculated for determining single-day monitoring reliability. The Spearman-Brown prophecy formula was used to estimate the minimum number of monitoring days required for achieving an ICC of 0.80. Single-day ICC values for time spent in SB and PA intensity categories ranged from 0.45 to 0.61. Minimum number of monitoring days required for achieving an ICC of 0.80 ranged from 2.5 to 4.9 days. In this study, a minimum of 5 consecutive days of monitoring was required for reliably estimating SB and PA from accelerometer data in older adults.
该研究的目的是确定在老年人中，通过加速度计数据可靠估计身体活动（PA）和久坐行为（SB）所需的最少监测天数。当地一家老年中心的42名老年人参与了这项研究。参与者在右髋部佩戴ActiGraph wGT3X-BT加速度计，连续佩戴7天。加速度计数据被下载到计算机，并转换为以60秒为一个时段的活动计数数据。使用常用的活动计数切点来估计久坐行为和不同身体活动强度类别的时间。分析纳入了至少有7个有效监测日（≥10小时/天）的参与者。计算组内相关系数（ICC）以确定单日监测的可靠性。使用斯皮尔曼-布朗预测公式来估计达到ICC为0.80所需的最少监测天数。久坐行为和身体活动强度类别的单日ICC值范围为0.45至0.61。达到ICC为0.80所需的最少监测天数范围为2.5至4.9天。在本研究中，要从老年人的加速度计数据中可靠估计久坐行为和身体活动，至少需要连续监测5天。
