Liu Sam, Brooks Dina, Thomas Scott, Eysenbach Gunther, Nolan Robert Peter
a Institute of Medical Science , University of Toronto , Toronto , Ontario , Canada.
J Sports Sci. 2015;33(10):1001-6. doi: 10.1080/02640414.2014.981847. Epub 2014 Dec 17.
The primary aim was to examine the criterion and construct validity and test-retest reliability of the Lifesource XL-18 pedometer (A&D Medical, Toronto, ON, Canada) for measuring steps under controlled and free-living activities. The influence of body mass index, waist size and walking speed on the criterion validity of XL-18 was also explored. Forty adults (35-74 years) performed a 6-min walk test in the controlled condition, and the criterion validity of XL-18 was assessed by comparing it to steps counted manually. Thirty-five adults participated in the free-living condition and the construct validity of XL-18 was assessed by comparing it to Yamax SW-200 (YAMAX Health & Sports, Inc., San Antonio, TX, USA). During the controlled condition, XL-18 did not significantly differ from criterion (P > 0.05) and no systematic error was found using Bland-Altman analysis. The accuracy of XL-18 decreased with slower walking speed (P = 0.001). During the free-living condition, Bland-Altman analysis revealed that XL-18 overestimated daily steps by 327 ± 118 than Yamax (P = 0.004). However, the absolute percent error (APE) (6.5 ± 0.58%) was still within an acceptable range. XL-18 did not differ statistically between pant pockets. XL-18 is suitable for measuring steps in controlled and free-living conditions. However, caution may be required when interpreting the steps recorded under slower speeds and free-living conditions.
主要目的是检验Lifesource XL - 18计步器（加拿大安大略省多伦多市A&D Medical公司）在受控和自由生活活动中测量步数的标准效度、结构效度以及重测信度。还探讨了体重指数、腰围和步行速度对XL - 18标准效度的影响。40名成年人（35 - 74岁）在受控条件下进行了6分钟步行测试，通过与手动计数的步数进行比较来评估XL - 18的标准效度。35名成年人参与了自由生活条件测试，通过与Yamax SW - 200（美国得克萨斯州圣安东尼奥市YAMAX健康与运动公司）进行比较来评估XL - 18的结构效度。在受控条件下，XL - 18与标准值无显著差异（P > 0.05），使用布兰德 - 奥特曼分析未发现系统误差。XL - 18的准确性随着步行速度减慢而降低（P = 0.001）。在自由生活条件下，布兰德 - 奥特曼分析显示，XL - 18比Yamax每日步数高估了327±118步（P = 0.004）。然而，绝对百分比误差（APE）（6.5±0.58%）仍在可接受范围内。XL - 18在裤兜之间的差异无统计学意义。XL - 18适用于在受控和自由生活条件下测量步数。然而，在解释较慢速度和自由生活条件下记录的步数时可能需要谨慎。
