Associations of objectively assessed sleep and physical activity in 11-year old children. (January 2015)

• Record Type: Journal Article
• Authors: Sorić, Maroje; Starc, Gregor; Borer, Katarina T.; Jurak, Gregor; Kovač, Marjeta; Strel, Janko; Mišigoj-Duraković, Marjeta
• Is Part Of: Annals of human biology. Volume 42:Number 1(2015:Jan./Feb.)
• Page Start: 31
• Page End: 37
• Publication Date: 2015-01
• Subjects: Human biology -- Periodicals; 612
• DOI: 10.3109/03014460.2014.928367
• Languages: English
• ISSNs: 0301-4460

Abstract

<abstract> <title>Abstract</title> <p> <italic>Aim</italic>: Objective methods were used to evaluate children's sleep and physical activity over several days in order to test the hypotheses that: (1) low average sleep duration and/or sleep efficiency are linked to a low amount of physical activity; and (2) a reduction in sleep quantity and/or sleep efficiency during the night is followed by a decrease in physical activity the following day.</p> <p> <italic>Methods</italic>: This is a multi-centre, observational study involving 276 children, aged 10.5–12 years, from diverse urban settings in Croatia, Slovenia and the US. Sleep and activity were monitored for 2–6 days (median = 4) using the Sensewear Armband™ multi-sensor body monitor.</p> <p> <italic>Results</italic>: While average sleep duration and efficiency were unrelated to physical activity, within-subjects associations revealed that an extra hour spent in bed during the night was followed by a 16-minute decrease in moderate-to-vigorous physical activity (<italic>p</italic> &lt; 0.001). This was accompanied by a 4.5 kJ/kg and 5.9 kJ/kg lower total daily energy expenditure in boys and girls, respectively (<italic>p</italic> &lt; 0.001).</p> <p> <italic>Conclusions</italic>: This study found no evidence for a link between short sleep and low or reduced physical activity.</p> </abstract>