Reliability of Physical Activity Measures During Free-Living Activities in People After Total Knee Arthroplasty
Reliability of Physical Activity Measures During Free-Living Activities in People After Total Knee Arthroplasty
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DOI：
10.2522/ptj.20150407
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发表时间：
2016-06-01
期刊：
影响因子：
3.2
通讯作者：
Piva, Sara R.
中科院分区：
文献类型：
--
作者：
Almeida, Gustavo J.;Irrgang, James J.;Piva, Sara R.
背景很少有测量身体活动（PA）的仪器可以准确地量化在轻强度和中等强度下进行的PA，这在老年人中特别相关。在自由生活条件下，其可靠性的证据是有限的。研究目的为：（1）确定Actigraph（ACT）、SenseWear臂带（SWA）和老年人社区健康活动模型计划（CHAMPS）问卷在全膝关节置换术后轻、中度自由生活PA评估中的重测信度;（2）比较3种工具的相对可靠性;以及（3）确定通常使用的监测时间范围（24小时、清醒小时和从清醒起10小时）的可靠性。采用单组重复测量设计。参与者佩戴活动监测器2周，每周结束时完成CHAMPS问卷。采用组内相关系数（ICC [2，k]）比较两周的PA测量值，确定重测信度。来自28名在2周内报告类似PA的参与者的数据被纳入分析。这些参与者的平均年龄为69岁（SD =8），其中75%为女性。ACT的可靠性范围为中度至极好（ICC=.75-.86），SWA（ICC=.93-.95）和CHAMPS问卷的可靠性范围为极好（ICC=.86）。SWA ICC的95%置信区间（95%CI）是唯一在极好可靠性范围（.85-.98）内的置信区间。CHAMPS问卷显示系统性偏倚，第2周报告的PA较少。清醒时间范围内PA测量的可靠性与24小时时间范围内的PA测量的可靠性相当，并反映了在此期间进行的大多数PA。时间间隔超过1周的可靠性可能较低。所有PA测量均显示出良好的可靠性。ACT的信度低于SWA和CHAMPS问卷。SWA提供了更精确的可靠性估计。在清醒时间佩戴PA监测器提供了足够可靠的措施，可以减轻佩戴者的负担。
Background. Few instruments that measure physical activity (PA) can accurately quantify PA performed at light and moderate intensities, which is particularly relevant in older adults. The evidence of their reliability in free-living conditions is limited.Objective. The study objectives were: (1) to determine the test-retest reliability of the Actigraph (ACT), SenseWear Armband (SWA), and Community Healthy Activities Model Program for Seniors (CHAMPS) questionnaire in assessing free-living PA at light and moderate intensities in people after total knee arthroplasty; (2) to compare the reliability of the 3 instruments relative to each other; and (3) to determine the reliability of commonly used monitoring time frames (24 hours, waking hours, and 10 hours from awakening).Design. A one-group, repeated-measures design was used.Methods. Participants wore the activity monitors for 2 weeks, and the CHAMPS questionnaire was completed at the end of each week. Test-retest reliability was determined by using the intraclass correlation coefficient (ICC [2,k]) to compare PA measures from one week with those from the other week.Results. Data from 28 participants who reported similar PA during the 2 weeks were included in the analysis. The mean age of these participants was 69 years (SD =8), and 75% of them were women. Reliability ranged from moderate to excellent for the ACT (ICC=.75-.86) and was excellent for the SWA (ICC=.93-.95) and the CHAMPS questionnaire (ICC=.86 The 95% confidence intervals (95% CI) of the ICCs from the SWA were the only ones within the excellent reliability range (.85-.98). The CHAMPS questionnaire showed systematic bias, with less PA being reported in week 2. The reliability of PA measures in the waking-hour time frame was comparable to that in the 24-hour time frame and reflected most PA performed during this period.Limitations. Reliability may be lower for time intervals longer than 1 week.Conclusions. All PA measures showed good reliability. The reliability of the ACT was lower than those of the SWA and the CHAMPS questionnaire. The SWA provided more precise reliability estimates. Wearing PA monitors during waking hours provided sufficiently reliable measures and can reduce the burden on people wearing them.