Active School Lesson Breaks Increase Daily Vigorous Physical Activity, but Not Daily Moderate to Vigorous Physical Activity in Elementary School Boys.

PURPOSE: Brief classroom-based episodes of physical activity (active lesson breaks, ALBs) have improved schoolchildren's classroom behaviors in some studies, and may also increase the likelihood of children meeting the recommended daily minutes of moderate to vigorous physical activity (MVPA). However, there is emerging evidence that increases in physical activity at particular times of the day may lead to compensatory declines at other times. This study explored evidence for compensatory declines in response to a 10 min ALB during the school day. METHOD: Thirty-eight 12-year-old boys from a single elementary school completed intervention and control conditions in a cross-over design, with each phase lasting one week. The intervention consisted of a single 10-min active lesson break delivered on each of three days in the intervention week. Twenty-four hour accelerometry was used to quantify moderate and vigorous physical activity. RESULTS: ALBs increased in-school MVPA by 5.8 min (p < .0001), but overall daily MVPA was similar between intervention and control conditions (77.2 vs 77.4 min/d, p > .05), However, vigorous physical activity increased significantly over the whole day (11.2 vs 8.9 min, p = .0006). CONCLUSION: A brief episode of classroom-based play led to a modest increase in vigorous physical activity in elementary school students, but did not increase MVPA across the day.

Can a school-based sleep education programme improve sleep knowledge, hygiene and behaviours using a randomised controlled trial.

OBJECTIVES: The present study investigated the effectiveness of a school-based sleep education programme in improving key sleep behaviours, sleep knowledge, and sleep hygiene. DESIGN AND METHODS: A cross-sectional cluster-randomised controlled trial with two groups (Intervention and Control) and three assessment time points [baseline, immediately post intervention (6 weeks post baseline) and follow-up (18 weeks post baseline)] was employed. A total of 296 students (mean age = 12.2 ± 0.6 years; 59% female) from 12 schools in Adelaide, South Australia, were recruited, with 149 participants in the Intervention group and 147 in the Control group. The intervention consisted of four classroom lessons delivered at weekly intervals, followed by a group project on sleep topics, which students presented at a parental information evening. Sleep patterns were assessed objectively (actigraphy, n = 175) and subjectively (time-use recall, n = 251) at three time points. Sleep knowledge and sleep hygiene (n = 296) were also measured. RESULTS: Generalised estimating equations were used to compare changes in the Intervention and Control groups. The programme increased time in bed by 10 min (p = 0.03) for the Intervention group relative to the Control group, due to a 10-min delay in wake time (p = 0.00). These changes were not sustained at follow-up. There was no impact on sleep knowledge or sleep hygiene. CONCLUSION: Investment in the sleep health of youth through sleep education is important but changes to sleep patterns are difficult to achieve. More intensive programmes, programmes with a different focus or programmes targeting different age groups may be more effective.