Langeard Antoine, Zouabi Amira, Martin Tristan, Quarck GaËlle, Gauthier Antoine
Normandie Univ, UNICAEN, INSERM, COMETE, Caen 14000, France.
Age Ageing. 2022 Mar 1;51(3). doi: 10.1093/ageing/afac061.
with ageing, the risk of falling increases. It has been reported that fall frequency may depend on the time of the day, suggesting a possible circadian rhythm of postural control. The objective was to test whether postural control in older adults followed a circadian rhythm. Then, in order to examine the possible functions involved in circadian variations in balance performances, circadian rhythm of sleepiness and vertical perception were also tested.
eight participants (70.7 ± 4.7 years) were included. Baseline circadian rhythm profile was assessed through continuous core temperature measurement. Static and dynamic balance, subjective sleepiness and fatigue, and verticality perception were measured at 2:00, 6:00, 10:00, 14:00, 18:00 and 22:00, on separate weeks in a random order.
temperature followed a circadian rhythm, with lowest temperature occurring at 03:50. Circadian rhythm was detected for the centre of pressure displacement length and velocity, in dynamic condition eyes closed, with lowest performances occurring at 18:33 and 16:59, respectively. Subjective sleepiness and fatigue also followed circadian rhythm with lowest sleepiness occurring at 15:46 and 15:50, for the Karolinska Sleeping Scale and the Visual Analogic Scale of fatigue, respectively. Finally, the vertical perception was not significantly following a circadian rhythm.
older adults present a circadian rhythm of balance, in particular in more challenging conditions, and the lowest performances occurred in the late afternoon These circadian rhythms could explain some of the falls happening at this time in community-dwelling older adults.
随着年龄增长，跌倒风险增加。据报道，跌倒频率可能取决于一天中的时间，这表明姿势控制可能存在昼夜节律。目的是测试老年人的姿势控制是否遵循昼夜节律。然后，为了研究平衡能力昼夜变化可能涉及的功能，还测试了嗜睡和垂直感知的昼夜节律。
纳入8名参与者（70.7±4.7岁）。通过连续测量核心体温评估基线昼夜节律特征。在不同周的2:00、6:00、10:00、14:00、18:00和22:00，以随机顺序分别测量静态和动态平衡、主观嗜睡和疲劳以及垂直感知。
体温遵循昼夜节律，最低体温出现在03:50。在闭眼动态条件下，压力中心位移长度和速度检测到昼夜节律，最低表现分别出现在18:33和16:59。主观嗜睡和疲劳也遵循昼夜节律，分别在15:46和15:50时嗜睡程度最低，这是根据卡罗林斯卡嗜睡量表和疲劳视觉模拟量表得出的。最后，垂直感知没有明显的昼夜节律。
老年人存在平衡的昼夜节律，特别是在更具挑战性的条件下，最低表现出现在下午晚些时候。这些昼夜节律可以解释社区居住老年人在这个时间段发生的一些跌倒情况。
