Felton Gwen M, Tudor-Locke Catrine, Burkett Lee
College of Nursing, University of South Carolina, Columbia 29208, USA.
Res Q Exerc Sport. 2006 Sep;77(3):304-8. doi: 10.1080/02701367.2006.10599364.
This study examined stability and reliability of free-living physical activity assessed by pedometer in 69 young female college students (M age = 18.7 years, SD = 1.2, range: 18-25 years; body mass index = 23.2 kg/m2, SD = 0.6) for two complete weeks (Week 1 and Week 2) separated by 12 weeks. During Week 1, participants took an average of 8880 steps/day, SD = 3219, range: 1858-19480; during Week 2 9088 steps/day, SD = 3299, range 1736-16837; t (68) = -.568, p = .572. In both weeks, only Sunday differed significantly (repeated measures analysis of variance; Week 1: p < .0001; Week 2: p < .01) from all other days of the week. The computed intraclass correlation between weeks was moderate (.72). Group mean pedometer-determined physical activity was stable across 2 weeks separated by 12 weeks in this young, healthy sample of women. Individuals within these groups held their rank order to a moderate extent over time. These findings provide important evidence of the reliability of pedometer-determined physical activity data and are of practical importance to study design.
本研究调查了计步器评估的69名年轻女大学生（平均年龄=18.7岁，标准差=1.2，范围：18 - 25岁；体重指数=23.2kg/m²，标准差=0.6）自由生活状态下身体活动的稳定性和可靠性，为期两个完整的星期（第1周和第2周），中间间隔12周。在第1周，参与者平均每天走8880步，标准差=3219，范围：1858 - 19480步；在第2周平均每天走9088步，标准差=3299，范围：1736 - 16837步；t（68）=-0.568，p = 0.572。在这两周中，只有周日与一周中的其他日子有显著差异（重复测量方差分析；第1周：p < 0.0001；第2周：p < 0.01）。两周之间计算得出的组内相关系数为中等（0.72）。在这个年轻健康的女性样本中，计步器测定的身体活动组均值在间隔12周的两周内是稳定的。这些组内个体在一段时间内其排名顺序保持在中等程度。这些发现为计步器测定的身体活动数据的可靠性提供了重要证据，对研究设计具有实际意义。
