Plekhanova Tatiana, Crawley Emily, Davies Melanie J, Gorely Trish, Harrington Deirdre M, Ioannidou Ekaterini, Khunti Kamlesh, Rowlands Alex V, Sherar Lauren B, Yates Tom, Edwardson Charlotte L
Diabetes Research Centre, University of Leicester, Leicester LE5 4PW, UK.
NIHR Leicester Biomedical Research Centre, Leicester LE5 4PW, UK.
Children (Basel). 2023 Apr 30;10(5):819. doi: 10.3390/children10050819.
The aim of this study was to (1) describe accelerometer-assessed physical behaviours by chronotype, and (2) examine the association between chronotype and accelerometer-assessed physical behaviours in a cohort of adolescent girls. Chronotype (single question) and physical behaviours (GENEActiv accelerometer on the non-dominant wrist) were assessed in 965 adolescent girls (13.9 ± 0.8 years). Linear mixed-effects models examined the relationships among chronotype and physical behaviours (time in bed, total sleep time, sleep efficiency, sedentary time, overall, light and moderate-to-vigorous physical activity) on weekdays and weekend days. Over the 24 h day, participants spent 46% sedentary, 20% in light activity, 3% in moderate-to-vigorous physical activity, and 31% in 'time in bed'. Seventy percent of participants identified as 'evening' chronotypes. Compared to evening chronotypes, morning chronotypes engaged in less sedentary time (10 min/day) and had higher overall physical activity (1.3 mg/day, ~30 min of slow walking) on weekdays. Most girls identified as evening chronotypes with a large proportion of their day spent sedentary and a small amount in physical activities which may be exacerbated in evening chronotypes on weekdays. The results maybe be important for programmes aiming to promote physical activity in adolescent girls.
（1）按昼夜节律类型描述通过加速度计评估的身体行为，以及（2）在一群青春期女孩中检验昼夜节律类型与通过加速度计评估的身体行为之间的关联。对965名青春期女孩（13.9±0.8岁）进行了昼夜节律类型（单个问题）和身体行为（非优势手腕佩戴GENEActiv加速度计）的评估。线性混合效应模型研究了工作日和周末昼夜节律类型与身体行为（卧床时间、总睡眠时间、睡眠效率、久坐时间、总体身体活动、轻度身体活动以及中度至剧烈身体活动）之间的关系。在24小时的一天中，参与者有46%的时间处于久坐状态，20%的时间进行轻度活动，3%的时间进行中度至剧烈身体活动，31%的时间处于“卧床时间”。70%的参与者被认定为“夜型”昼夜节律类型。与夜型昼夜节律类型相比，晨型昼夜节律类型在工作日的久坐时间更少（每天10分钟），总体身体活动水平更高（每天1.3毫克，约相当于30分钟慢走）。大多数女孩被认定为夜型昼夜节律类型，她们一天中的大部分时间处于久坐状态，进行身体活动的时间较少，而在工作日，夜型昼夜节律类型的这种情况可能会更加严重。这些结果对于旨在促进青春期女孩身体活动的项目可能具有重要意义。
