Department of Medicine, McMaster University, Hamilton, Ontario, Canada
Community Health, University of Manitoba, Winnipeg, Manitoba, Canada.
BMJ Open. 2024 Nov 27;14(11):e084610. doi: 10.1136/bmjopen-2024-084610.
To map the context of sedentary behaviour in older adults who are prefrail and frail during the winter and spring over 3 days (2 weekdays and 1 weekend) and to determine if certain types of sedentary behaviours are associated with health outcomes.
Mixed methods, prospective longitudinal cohort study.
Community-dwelling older adults living in southern Ontario, Canada.
We recruited 21 older adults (72±7.3 years, 13 females, 13 frail) and experienced two dropouts.
Participants accumulated a total of 18.4±2.6 hours/day of sedentary time in winter and 17.7±3.1 hours/day in spring. When considering daily indoor sedentary time (excluding sleep), participants accumulated 7.6±4.0 hours/day in winter and 6.3±2.7 hours/day in spring. In the spring, 68% of participants accumulated <8 hours/day of ≥15 min bouts of indoor sedentary time compared with 63% in the winter. Although there were no differences in sedentary time between seasons, we found a significant decrease in step count in winter (1190 fewer steps, 95% CI -2228 to -153 steps). There were no differences in sedentary time or step count between the weekday and weekend or between individuals who were prefrail and frail. There were no seasonal variations in participants' sedentary activities; the most common activities were watching television (TV), eating, napping, browsing the internet and socialising. We also found there may be gender differences in time and activities. Individuals who identified as female were more sedentary than individuals who were male. Almost all indoor behaviours occurred in the living/family room. Sedentary time was evenly spread throughout the day; however, prolonged sedentary behaviours ≥60 min mainly occurred in the evening regardless of the season. Step count in both winter and spring was positively associated with the Nottingham Activity of Daily Living assessment. There was an inverse association between sedentary behaviours ≥60 min (not including sleeping) and the 5×sit-to-stand and grip strength.
The current definition of sedentary behaviour requires modification to capture total sedentary time, continuous bouts >60 min, the types of behaviours, time of day and season.
NCT05661058.
在冬季和春季的 3 天（2 个工作日和 1 个周末）内描绘衰弱前期和衰弱老年人的久坐行为背景，并确定某些类型的久坐行为是否与健康结果相关。
混合方法，前瞻性纵向队列研究。
加拿大安大略省南部的社区居住的老年人。
我们招募了 21 名年龄在 72±7.3 岁的老年人（13 名女性，13 名虚弱），其中有 2 名参与者退出。
参与者在冬季总共积累了 18.4±2.6 小时/天的久坐时间，在春季积累了 17.7±3.1 小时/天。当考虑每日室内久坐时间（不包括睡眠）时，参与者在冬季积累了 7.6±4.0 小时/天，在春季积累了 6.3±2.7 小时/天。在春季，68%的参与者累计每天室内久坐时间不足 8 小时，但持续 15 分钟以上的时间不足 8 小时，而在冬季，这一比例为 63%。尽管季节之间的久坐时间没有差异，但我们发现冬季的步数明显减少（减少 1190 步，95%置信区间-2228 到-153 步）。工作日和周末之间或衰弱前期和衰弱期之间的久坐时间或步数没有差异。参与者的久坐活动没有季节性变化；最常见的活动是看电视（TV）、吃饭、打盹、上网和社交。我们还发现，性别差异可能存在于时间和活动方面。女性参与者比男性参与者更久坐。几乎所有的室内活动都发生在起居/家庭房。久坐时间全天均匀分布；然而，无论季节如何，长时间（≥60 分钟）的久坐行为主要发生在晚上。冬季和春季的步数与诺丁汉日常活动评估呈正相关。持续 60 分钟以上的久坐行为（不包括睡眠）与 5×坐立站起和握力呈负相关。
目前的久坐行为定义需要修改，以捕捉总久坐时间、连续超过 60 分钟的时间、行为类型、时间和季节。
NCT05661058。
