Applicable and accurate assessment methods are required for a clinically relevant quantification of habitual physical activity (PA) levels and sedentariness in older adults. The aim of this study is to compare habitual PA and sedentariness, as assessed with 1) a wrist-worn actigraph, 2) a hybrid motion sensor attached to the lower back, and 3) a self-estimation based on a questionnaire. Over the course of one week, PA of 58 community-dwelling subjectively healthy older adults was recorded. The results indicate that actigraphy overestimates the PA levels in older adults, whereas sedentariness is underestimated when compared to the hybrid motion sensor approach. Significantly longer durations (hh:mm/day) for all PA intensities were assessed with the actigraph (light: 04:19; moderate to vigorous: 05:08) when compared to the durations (hh:mm/day) that were assessed with the hybrid motion sensor (light: 01:24; moderate to vigorous: 02:21) and the self-estimated durations (hh:mm/day) (light: 02:33; moderate to vigorous: 03:04). Actigraphy-assessed durations of sedentariness (14:32 hh:mm/day) were significantly shorter when compared to the durations assessed with the hybrid motion sensor (20:15 hh:mm/day). Self-estimated duration of light intensity was significantly shorter when compared to the results of the hybrid motion sensor. The results of the present study highlight the importance of an accurate quantification of habitual PA levels and sedentariness in older adults. The use of hybrid motion sensors can offer important insights into the PA levels and PA types (e.g., sitting, lying) and it can increase the knowledge about mobility-related PA and patterns of sedentariness, while actigraphy appears to be not recommendable for this purpose.

中文翻译：

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量化老年人的日常体育活动和久坐感-两种同时佩戴在身上的运动传感器方法和自我估计的不同结果。

临床上需要对老年人的习惯性体育活动（PA）水平和久坐不动进行量化，因此需要适用和准确的评估方法。这项研究的目的是比较惯常的PA和久坐感，以1）腕戴式活动记录仪，2）附着在下背部的混合运动传感器以及3）基于问卷的自我估计进行评估。在一个星期的过程中，记录了58位主观健康的社区居民的PA。结果表明，与混合运动传感器方法相比，书法记录法高估了成年人的PA水平，而久坐则被低估了。与持续时间（hh：mm）相比，用活动记录仪评估了所有PA强度的持续时间（hh：mm / day）明显更长（光：04：19；中度到剧烈：05：08）。毫米/天）（使用混合运动传感器（光线：01：24；中度至剧烈：02：21）和自我估计的持续时间（小时：毫米/天）（光线：02：33；中度至剧烈）进行评估：03:04）。与通过混合运动传感器评估的持续时间（20:15 hh：mm / day）相比，通过书法评估的久坐时间（14:32 hh：mm / day）要短得多。与混合运动传感器的结果相比，自我估计的光强度持续时间明显缩短。本研究的结果强调了准确定量老年人习惯性PA水平和久坐的重要性。混合运动传感器的使用可以提供有关PA水平和PA类型（例如，坐着，躺着）的重要见解，并且可以增加有关与流动性相关的PA和久坐模式的知识，