Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UNITED KINGDOM.
Med Sci Sports Exerc. 2018 Mar;50(3):525-532. doi: 10.1249/MSS.0000000000001458.
Pedometers, which enable self-monitoring of step counts, are effective in facilitating increases in physical activity. Similar devices which provide real-time feedback on sedentary (sitting) behavior are limited. This study aimed to develop and validate a novel device-the SitFIT-which could accurately measure and provide feedback on sedentary behavior and physical activity.
The SitFIT is a triaxial accelerometer, developed by PAL Technologies, which is worn in the front trouser pocket. This enables tracking of thigh inclination and therefore differentiation between sitting and upright postures, as well as tracking of step count. It has a display to provide user feedback. To determine the validity of the SitFIT for measuring sedentary behavior and step counts, 21 men, age 30 to 65 yr, with body mass index 26.6 ± 3.9 kg·m wore a SitFIT in a front trouser pocket and an activPAL accelerometer attached to their thigh for up to 7 d. Outputs from the SitFIT were compared with the activPAL, which was assumed to provide criterion standard measurements of sitting and step counts.
Mean step counts were approximately 4% lower with the SitFIT than activPAL, with correlation between the two methods being very high (r = 0.98) and no obvious bias from the line of equality (regression line, y = 1.0035x + 418.35). Mean sedentary time was approximately 5% higher with the SitFIT than activPAL, correlation between methods was high (r = 0.84), and the equation of the regression line was close to the line of equality (y = 0.8728x + 38.445).
The SitFIT has excellent validity for measurement of free-living step counts and sedentary time and therefore addresses a clear need for a device that can be used as a tool to provide feedback on sedentary behavior to facilitate behavior change.
计步器可实现对步数的自我监测，对于促进身体活动的增加非常有效。然而，能够实时反馈久坐（坐立）行为的类似设备却十分有限。本研究旨在开发并验证一种新型设备——SitFIT，它可以准确测量和反馈久坐行为和身体活动。
SitFIT 是一种三轴加速度计，由 PAL 技术公司开发，佩戴于前裤兜内。它可以跟踪大腿倾斜度，从而区分坐姿和直立姿势，以及跟踪步数。它有一个显示屏，可提供用户反馈。为了确定 SitFIT 测量久坐行为和步数的有效性，我们让 21 名年龄在 30 至 65 岁、BMI 为 26.6 ± 3.9kg·m 的男性在 7 天内，在前裤兜内佩戴 SitFIT，并在大腿上佩戴 activPAL 加速度计。将 SitFIT 的输出结果与 activPAL 进行比较，后者被认为是测量坐立和步数的标准方法。
SitFIT 的平均步数比 activPAL 低约 4%，两种方法之间的相关性非常高（r = 0.98），且不存在明显的偏离（回归线，y = 1.0035x + 418.35）。SitFIT 的平均久坐时间比 activPAL 高约 5%，两种方法之间的相关性较高（r = 0.84），回归线接近平等线（y = 0.8728x + 38.445）。
SitFIT 非常适合测量自由生活中的步数和久坐时间，因此满足了人们对一种能够提供久坐行为反馈以促进行为改变的工具的明确需求。
