PURPOSE Accelerometers are used to objectively measure physical behaviors in free-living environments, typically for ≥7 consecutive days. We examined whether participants experience "wear fatigue", a decline in wear time day over day, during typical assessment period acquired in a nationally representative sample of 6-80-year-olds in the United States (U.S.). METHODS Participants were instructed to wear an ActiGraph GT3X+ on their non-dominant wrist continuously for 7 consecutive days. Participants with seven complete days of recorded data, regardless of wear status, were included in the analyses (N = 13,649). Wear was scored with the Sleep-Wake-and-Nonwear (SWaN) algorithm. RESULTS Participants averaged 1248 ± 3.6 (Mean ± SE) min·day-1 of wear over the assessment but wear time linearly decreased from day 1 (1295 ± 3.2 minutes) to day 7 (1170 ± 5.3 minutes) resulting in a wear fatigue of -18.1 ± 0.7 min·day-1 (β ± SE). Wear fatigue did not differ by sex but varied by age group - highest in adolescents (-26.8 ± 2.4 min·day-1) and lowest in older adults (-9.3 ± 0.9 min·day-1). Wear was lower in evening (18:00-23:59) and early morning (00:00-05:59) compared to the middle of the day and on weekend days compared to weekdays. We verified similar wear fatigue (-23.5 ± 0.7 min·day-1) in a separate sample (N = 14,631) with hip-worn devices and different wear-scoring. Applying minimum wear criteria of ≥10 h·day-1 for ≥4 days reduced wear fatigue to -5.3 mins·day-1 and -18.7 mins·day-1 for the wrist and hip, respectively. CONCLUSIONS Patterns of wear suggest non-compliance may disproportionately affect estimates of sleep and sedentary behavior, particularly for adolescents. Further study is needed to determine the impact of wear fatigue on longer assessments.

中文翻译：

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在自由生活评估期间，腕戴式加速度计的佩戴合规性是否会减弱？NHANES 分析。

目的 加速计用于客观测量自由生活环境中的身体行为，通常连续 ≥7 天。我们对美国 (US) 具有全国代表性的 6-80 岁人群样本进行典型评估期间，研究参与者是否会经历“佩戴疲劳”，即佩戴时间逐日减少。方法 参与者被要求连续 7 天在非惯用手腕上佩戴 ActiGraph GT3X+。具有完整 7 天记录数据的参与者，无论佩戴状态如何，都被纳入分析中 (N = 13,649)。佩戴情况通过睡眠唤醒和不佩戴 (SWaN) 算法进行评分。结果 参与者在评估期间平均磨损 1248 ± 3.6（平均值 ± SE）min·day-1，但磨损时间从第 1 天（1295 ± 3.2 分钟）到第 7 天（1170 ± 5.3 分钟）线性减少，导致磨损疲劳-18.1 ± 0.7 分钟·第 1 天 (β ± SE)。磨损疲劳不因性别而异，但因年龄组而异——青少年最高（-26.8 ± 2.4 min·day-1），老年人最低（-9.3 ± 0.9 min·day-1）。与中午相比，晚上（18:00-23:59）和清晨（00:00-05:59）的磨损程度较低，周末与工作日相比，磨损程度较低。我们在一个单独的样本 (N = 14,631) 中使用髋部佩戴设备和不同的磨损评分验证了类似的磨损疲劳 (-23.5 ± 0.7 min·day-1)。采用≥10 h·day-1 的最低磨损标准并持续≥4 天，可将手腕和臀部的磨损疲劳分别降低至-5.3 分钟·day-1 和-18.7 分钟·day-1。结论 佩戴方式表明，不遵守规定可能会严重影响睡眠和久坐行为的估计，特别是对于青少年而言。需要进一步研究以确定磨损疲劳对长期评估的影响。