Egerton Thorlene, Helbostad Jorunn L, Stensvold Dorthe, Chastin Sebastien F M
J Aging Phys Act. 2016 Oct;24(4):633-641. doi: 10.1123/japa.2015-0237. Epub 2016 Aug 24.
Fatigue has been associated with reductions in daily activity of older people. Summary measures of daily physical activity provide limited understanding of how fatigue affects physical activity behavior. This study examined the hour-by-hour energy expenditure estimated from accelerometry data to provide insight into physical activity behaviors of older people experiencing fatigue. Fatigued participants were matched to 'not fatigued' participants by age, sex, and BMI. Each group consisted of 86 people with a mean age 73.8 years (SD 2.0), BMI 26.5 kg⋅m (SD 3.9) and 61% female. The phase-space plot, constructed to express rate of change of average vertical axis counts per hour as a time series, showed fatigued participants deviated from the not fatigued participants during the morning period, when hour-by-hour activity was increasing. Older people who feel fatigued have a different morning activity pattern, which appears to lead to the lower overall levels of physical activity.
疲劳与老年人日常活动量的减少有关。日常身体活动的综合测量方法对疲劳如何影响身体活动行为的理解有限。本研究通过加速度计数据估算逐小时的能量消耗，以深入了解经历疲劳的老年人的身体活动行为。根据年龄、性别和体重指数，将疲劳的参与者与“无疲劳”的参与者进行匹配。每组由86人组成，平均年龄73.8岁（标准差2.0），体重指数26.5kg·m（标准差3.9），女性占61%。构建相空间图以将每小时平均垂直轴计数的变化率表示为时间序列，结果显示在逐小时活动增加的早晨时段，疲劳的参与者与无疲劳的参与者出现了偏差。感到疲劳的老年人具有不同的早晨活动模式，这似乎导致了总体身体活动水平较低。
