有这样有效的应用程序吗？免费计步器 iPhone 应用程序的有效性。
Is there a valid app for that? Validity of a free pedometer iPhone application.
机构信息
Dept of Health, Physical Education, and Recreation, Missouri Western State University, St. Joseph, MO, USA.
出版信息
J Phys Act Health. 2012 Jul;9(5):670-6. doi: 10.1123/jpah.9.5.670. Epub 2011 Jul 29.
BACKGROUND
This study examined the validity of a selected free pedometer application (iPedometer; IP) for the iPhone that could be used to assess physical activity.
METHODS
Twenty college students (10 men, 10 women; mean age: 21.85 ± 1.57 yrs) wore an iPhone at 3 locations (pocket, waist, arm) and a StepWatch 3 Step Activity Monitor (SW) on their right ankle while walking on a treadmill at 5 different speeds (54, 67, 80, 94, 107 m·min(-1)). A research assistant counted steps with a tally counter (TC).
RESULTS
Statistical significance between the TC, SW, and IP was found during every condition except IP in the pocket at 107 m·min(-1) (F(2,38) = .64, P = .54). Correlations involving the IP revealed only 1 positive correlation (IP on arm at 54 m·min(-1)) for any of the conditions (r = .46, P = .05).
CONCLUSION
The IP application was not accurate in counting steps and recorded significantly lower step counts than the SW and TC. Thus, the free pedometer application used is not a valid instrument for monitoring activity during treadmill walking.
背景
本研究旨在检验一款可用于评估身体活动的 iPhone 专用免费计步器应用程序（iPedometer；IP）的有效性。
方法
20 名大学生（10 名男性，10 名女性；平均年龄：21.85±1.57 岁）在跑步机上以 5 种不同速度（54、67、80、94、107 m·min(-1)）行走时，分别在 3 个位置（口袋、腰部、手臂）佩戴 iPhone 和 StepWatch 3 步活动监测器（SW），同时在右脚踝上佩戴 StepWatch 3 步活动监测器（SW）。一位研究助理使用计数器（TC）计数步数。
结果
除了在以 107 m·min(-1)的速度佩戴在口袋里的 IP 外，在所有其他条件下，TC、SW 和 IP 之间的统计差异均具有显著性（F(2,38) =.64，P =.54）。涉及 IP 的相关性仅显示出 1 个正相关（在 54 m·min(-1)的速度下佩戴在手臂上的 IP），且在任何条件下的相关系数（r）均为.46，P =.05。
结论
该 IP 应用程序在计数步数方面不够准确，与 SW 和 TC 相比，其记录的步数明显较少。因此，所使用的免费计步器应用程序不能作为监测跑步机行走时活动的有效工具。
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