Comparison of GT3X Accelerometer and YAMAX Pedometer Steps/Day in a Free-Living Sample of Overweight and Obese Adults
Comparison of GT3X Accelerometer and YAMAX Pedometer Steps/Day in a Free-Living Sample of Overweight and Obese Adults
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DOI：
10.1123/jpah.10.2.263
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发表时间：
2013-02-01
影响因子：
3.1
通讯作者：
Katzmarzyk, Peter T.
中科院分区：
文献类型：
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作者：
Barreira, Tiago V.;Tudor-Locke, Catrine;Katzmarzyk, Peter T.
背景资料：本研究的目的是比较YAMAX SW-200计步器与Actigraph GT 3X加速度计在自由生活的成年人中检测到的步数/天。方法：从23名超重和肥胖参与者（78%为女性;年龄= 52.6 ± 8.4岁; BMI = 31.0 +/- 3.7 m.kg（-2））。因为计步器更有可能用于社区干预计划，所以它被用作比较的标准。计算百分比差异（PD）和绝对百分比差异（APD），以检查仪器间一致性。此外，根据PD对天数进行分类：a）计数不足（> -10 PD），B）可接受计数（-10至10 PD），以及9）计数过度（> 10 PD）。结果：YAMAX和GT 3X分别检测到8，025 +/-3，967和7131 +/- 3066步/天，输出高度相关（r = 0.87）。平均PD为-3.1% +/- 30.7%，平均APD为23.9% +/-19.4%。相对于YAMAX，GT 3X检测到的天数中有53%被归类为计数不足，25%为可接受计数，23%为过度计数。结论：虽然这两种工具的输出高度相关，但在直接比较或互换使用其输出时应谨慎。
Background: The purpose of this study was to compare steps/day detected by the YAMAX SW-200 pedometer versus the Actigraph GT3X accelerometer in free-living adults. Methods: Daily YAMAX and GT3X steps were collected from a sample of 23 overweight and obese participants (78% female; age = 52.6 +/- 8.4 yr.; BMI = 31.0 +/- 3.7 m.kg(-2)). Because a pedometer is more likely to be used in a community-based intervention program, it was used as the standard for comparison. Percent difference (PD) and absolute percent difference (APD) were calculated to examine between-instrument agreement. In addition, days were categorized based on PD: a) under-counting (> -10 PD), b) acceptable counting (-10 to 10 PD), and 9) over-counting (> 10 PD). Results: The YAMAX and GT3X detected 8,025 +/- 3,967 and 7131 +/- 3066 steps/day, respectively, and the outputs were highly correlated (r = .87). Average PD was -3.1% +/- 30.7% and average APD was 23.9% +/- 19.4%. Relative to the YAMAX, 53% of the days detected by the GT3X were classified as under-counting, 25% acceptable counting, and 23% over-counting. Conclusion: Although the output of these 2 instruments is highly correlated, caution is advised when directly comparing or using their output interchangeably.