Measures of Physical Activity Using Cell Phones: Validation Using Criterion Methods
Measures of Physical Activity Using Cell Phones: Validation Using Criterion Methods
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DOI：
10.2196/jmir.1298
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发表时间：
2010-01-01
影响因子：
7.4
通讯作者：
Litton, Jan-Eric
中科院分区：
文献类型：
--
作者：
Bexelius, Christin;Lof, Marie;Litton, Jan-Eric
背景：体力活动与许多慢性疾病的风险降低有关。在大型流行病学研究中收集的体力活动数据通常基于纸质问卷。这些问卷的有效性是有争议的，更有效的方法是need.Objective：本研究评估重复测量的体力活动水平（PAL）和使用基于Java的问卷下载到手机上收集这些数据的可行性。所获得的数据进行了比较与参考估计的基础上的双标记水的方法和间接测热法（PAL（参考））。方法：使用基于Java的手机应用程序，22名妇女报告了他们的身体活动的基础上回答两个简短的问题，每天超过14天的时间（PAL（细胞））。结果进行了比较与参考数据从双标记水的方法和间接测热法（PAL（参考））。结果还与女性在14天结束时完成的两份常规纸质问卷（PAL（问题1）和PAL（问题2））评估的身体活动水平进行了比较。使用Bland和Altman程序将PAL（cell）、PAL（quest 1）和PAL（quest 2）与PAL（ref）进行比较。结果如下：PAL（cell）和PAL（ref）之间的平均差异较小（0.014）协议范围狭窄（2SD = 0.30）与PAL（ref）相比，PAL（quest 1）和PAL（quest 2）的平均差异也较小（分别为0.004和0.07）;然而，一致性的限度更宽（PAL（quest），2SD = 0.50和PAL（quest 2），2SD = 0.90）。与PAL（ref）相比，PAL（问题1）（回归线斜率= 0.79，P = .04）和PAL（问题2）（回归线斜率= 1.58，P < .001）的趋势检验具有统计学显著性。结论：每天使用手机进行的基于Java的体力活动问卷调查产生的PAL估计值与PAL参考值吻合良好。此外，使用手机获得的PAL和参考值之间的协议的限制窄于使用纸质问卷获得的相应估计。基于Java的问卷下载到手机上可能是一个可行的和具有成本效益的方法，收集数据的大规模前瞻性研究的身体活动。
Background: Physical activity is associated with reduced risks of many chronic diseases. Data collected on physical activity in large epidemiological studies is often based on paper questionnaires. The validity of these questionnaires is debated, and more effective methods are needed.Objective: This study evaluates repeated measures of physical activity level (PAL) and the feasibility of using a Java-based questionnaire downloaded onto cell phones for collection of such data. The data obtained were compared with reference estimates based on the doubly labeled water method and indirect calorimetry (PAL(ref)).Method: Using a Java-based cell phone application, 22 women reported their physical activity based on two short questions answered daily over a 14-day period (PAL(cell)).Results were compared with reference data obtained from the doubly labeled water method and indirect calorimetry (PAL(ref)). Results were also compared against physical activity levels assessed by two regular paper questionnaires completed by women at the end of the 14-day period (PAL(quest1) and PAL(quest2)). PAL(cell), PAL(quest1), and PAL(quest2) were compared with PAL(ref) using the Bland and Altman procedure. Results: The mean difference between PAL(cell), and PAL(ref) was small (0.014) with narrow limits of agreement (2SD = 0.30) Compared with PAL(ref) the mean difference was also small for PAL(quest1) and PAL(quest2) (0.004 and 0.07, respectively); however, the limits of agreement were wider (PAL(quest), 2SD = 0.50 and PAL(quest2), 2SD = 0.90). The test for trend was statistically significant for PAL(quest1) (slope of regression line = 0.79, P = .04) as well as for PAL(quest2) (slope of regression line = 1.58, P < .001) when compared with PAL(ref).Conclusion: A Java-based physical activity questionnaire administered daily using cell phones produced PAL estimates that agreed well with PAL reference values. Furthermore, the limits of agreement between PAL obtained using cell phones, and reference values were narrower than for corresponding estimates obtained using paper questionnaires. Java-based questionnaires downloaded onto cell phones may be a feasible and cost-effective method of data collection for large-scale prospective studies of physical activity.