Lubans David R, Smith Jordan J, Eather Narelle, Leahy Angus A, Morgan Philip J, Lonsdale Chris, Plotnikoff Ronald C, Nilsson Michael, Kennedy Sarah G, Holliday Elizabeth G, Weaver Natasha, Noetel Michael, Shigeta Tatsuya T, Mavilidi Myrto F, Valkenborghs Sarah R, Gyawali Prajwal, Walker Frederick R, Costigan Sarah A, Hillman Charles H
Priority Research Centre for Physical Activity and Nutrition, Faculty of Education and Arts, University of Newcastle, Callaghan, New South Wales, Australia
Priority Research Centre for Physical Activity and Nutrition, Faculty of Education and Arts, University of Newcastle, Callaghan, New South Wales, Australia.
Br J Sports Med. 2020 Dec 21;55(13):751-8. doi: 10.1136/bjsports-2020-103277.
Cardiorespiratory fitness (CRF) is an important marker of current and future health status. The primary aim of our study was to evaluate the impact of a time-efficient school-based intervention on older adolescents' CRF.
Two-arm cluster randomised controlled trial conducted in two cohorts (February 2018 to February 2019 and February 2019 to February 2020) in New South Wales, Australia. Participants (N=670, 44.6% women, 16.0±0.43 years) from 20 secondary schools: 10 schools (337 participants) were randomised to the Burn 2 Learn (B2L) intervention and 10 schools (333 participants) to the control. Teachers in schools allocated to the B2L intervention were provided with training, resources, and support to facilitate the delivery of high-intensity interval training (HIIT) activity breaks during curriculum time. Teachers and students in the control group continued their usual practice. The primary outcome was CRF (20 m multi-stage fitness test). Secondary outcomes were muscular fitness, physical activity, hair cortisol concentrations, mental health and cognitive function. Outcomes were assessed at baseline, 6 months (primary end-point) and 12 months. Effects were estimated using mixed models accounting for clustering.
We observed a group-by-time effect for CRF (difference=4.1 laps, 95% CI 1.8 to 6.4) at the primary end-point (6 months), but not at 12 months. At 6 months, group-by-time effects were found for muscular fitness, steps during school hours and cortisol.
Implementing HIIT during curricular time improved adolescents' CRF and several secondary outcomes. Our findings suggest B2L is unlikely to be an effective approach unless teachers embed sessions within the school day.
Australian New Zealand Clinical Trials Registry (ACTRN12618000293268).
心肺适能（CRF）是当前和未来健康状况的重要指标。我们研究的主要目的是评估一项高效的校内干预措施对大龄青少年心肺适能的影响。
在澳大利亚新南威尔士州的两个队列（2018年2月至2019年2月和2019年2月至2020年2月）中进行双臂整群随机对照试验。来自20所中学的参与者（N = 670，44.6%为女性，年龄16.0±0.43岁）：10所学校（337名参与者）被随机分配至“燃烧学习”（B2L）干预组，10所学校（333名参与者）为对照组。分配至B2L干预组的学校的教师接受了培训、获得了资源并得到支持，以便在课程时间内开展高强度间歇训练（HIIT）活动课间休息。对照组的教师和学生继续他们的常规做法。主要结局是心肺适能（20米多级 fitness 测试）。次要结局包括肌肉适能、身体活动、头发皮质醇浓度、心理健康和认知功能。在基线、6个月（主要终点）和12个月时评估结局。使用考虑聚类的混合模型估计效应。
在主要终点（6个月）时，我们观察到心肺适能存在组×时间效应（差异 = 4.1圈，95%CI 1.8至6.4），但在12个月时未观察到。在6个月时，发现肌肉适能、在校时间步数和皮质醇存在组×时间效应。
在课程时间内实施高强度间歇训练可改善青少年的心肺适能和一些次要结局。我们的研究结果表明，除非教师将课程安排在学校日，否则“燃烧学习计划”不太可能是一种有效的方法。
澳大利亚新西兰临床试验注册中心（ACTRN12618000293268）
