Prevention Research Center, University of South Carolina, Columbia, SC, USA.
J Phys Act Health. 2011 Mar;8(3):372-81. doi: 10.1123/jpah.8.3.372.
This study was designed to validate the Actical activity monitor in middle-aged and older adults of varying body composition to develop accelerometer thresholds to distinguish between light and moderate intensity physical activity (PA).
Nonobese 45 to 64 yr (N = 29), obese 45 to 64 yr (N = 21), and ≥65 yr (N = 23; varying body composition) participants completed laboratory-based sitting, household, and locomotive activities while wearing an Actical monitor and a portable metabolic measurement system. Nonlinear regression analysis was used to identify activity count (AC) cut-points to differentiate between light intensity (<3 METs) and moderate intensity (≥3METs) PA.
Using group-specific algorithms, AC cut points for 3 METs were 1634, 1107, and 431 for the obese 45 to 64 yr group, nonobese 45 to 64 yr group, and ≥65 yr group, respectively. However, sensitivity and specificity analysis revealed that an AC cut-point of 1065 yielded similar accuracy for detecting an activity as less than or greater than 3 METs, regardless of age and body composition.
For the Actical activity monitor, an AC cut-point of 1065 can be used to determine light and moderate intensity PA in people ≥45 years of age.
本研究旨在验证 Actical 活动监测器在不同身体成分的中年和老年人中的有效性，以制定加速度计阈值来区分轻强度和中强度体力活动（PA）。
非肥胖 45 至 64 岁（N=29）、肥胖 45 至 64 岁（N=21）和≥65 岁（N=23；身体成分不同）的参与者在佩戴 Actical 监测器和便携式代谢测量系统的情况下完成了实验室坐姿、家庭和运动活动。非线性回归分析用于确定活动计数（AC）切点，以区分低强度（<3 METs）和中强度（≥3METs）PA。
使用组特异性算法，肥胖 45 至 64 岁组、非肥胖 45 至 64 岁组和≥65 岁组中 3 METs 的 AC 切点分别为 1634、1107 和 431。然而，敏感性和特异性分析表明，AC 切点为 1065 时，无论年龄和身体成分如何，检测低于或高于 3 METs 的活动的准确性相似。
对于 Actical 活动监测器，AC 切点为 1065 可用于确定≥45 岁人群的轻强度和中强度 PA。
