日记监测和评价45-59岁成年人体力活动的信效度研究
Reliability and validation of A Physical Activity Diary in Assessing and Evaluating Physical Activity

摘要：目的：开发体力活动日记；评价体力活动日记的可靠性，探究体力活动日记特定信度要求下的最小记录天数；评价体力活动日记与加速度计在各指标测量上的一致性和影响因素，制定体力活动日记对体力活动是否不足的评价标准。方法：105名受试对象,其中男性53名，年龄为53.2±4.3岁，女性52名，平均年龄为52.5±4.3岁，同时佩戴加速度计和记录体力活动日记7 d时间，数据信度采用组内相关系数ICC分析，Spearman Brown预测公式推算信度要求0.7下的最小记录天数，Bland-Altman图和Pearson相关系数评价一致性，组间比较采用独立样本t检验，采用Kappa检验和ROC曲线制定日记的体力活动评价标准。结果：体力活动日记各项指标任意两天间的一致性水平中等到良好；两种测量方法每人每天的体力活动各指标中度相关，统计学检验都具有显著性差异；女性在记录日记时对中等到较大强度活动时间的高估显著高于男性，而超重或肥胖的受试对象更容易高估低强度体力活动时间。结论：对于45~59岁中年人群，填写任意3 d的体力活动日记，每天时间不小于9 h就可以代表日常体力活动的主观记录，但提供绝对的体力活动数值还有待进一步完善，日记中平均每天中等到较大强度体力活动的主观记录时间(非实际完成时间)低于56.2 min是本研究中体力活动不足的判断标准，需在大样本人群中进一步验证。
Abstract: Purpose: The purpose of this study was to assess the reliability and validity of a new developed physical activity diary. It wanted to explore the minimum days to record physical activity for physical activity dairy by comparing dairy to accelerometer, and to develop assessment standard of physical activity. Methods: One hundred and five people (53 males, aged 53.2±4.3; 52 females, aged 52.5±4.3) were recruited. All of them were asked to wear an accelerometer and finish a physical activity diary simultaneously for 7 days. The statistical analysis of assessing reliability consisted of ICC, Spearman-Brown prophecy formula. Pearson’s rho(r) correlation was used to evaluate the relevance and the Bland-Altman analysis was used to evaluate the consistency between self-reported diary and accelerometers. Kappa rho (Kappa) and ROC curve also were used to develop assessment standard of physical activity. Results: 1) The ICC of random two days in physical activity diary was good. 2) EE, SB, LPA, MVPA, CMVPA, MET rate were all significantly different between diary records and accelerometer. 3) Females were more liked to overestimate their daily’s MVPA and fatter people were more liked to overestimate their daily’s LPA. Conclusions: At least 3 days are needed to evaluate middle-aged people's physical activity if you record at least 9 hours each day; the person who doesn’t reach 56.2 minutes MVPA on average day is “under- active”; conclusions need further research in large population