The Future of Education

Background: High-Intensity Interval Training (HIIT) is a powerful stimulus in improving body composition and cardiometabolic risk in adults, and preliminary data in adolescents are also promising. HIIT is presented as a time-efficient alternative in comparison to aerobic training, that leverages the impact on the number of practitioners of Physical Exercise that results in health outcomes improvements, mainly from adolescents.
Objectives: evaluate the utility of a HIIT program integrated in High-School Physical Education classes, on Physical Condition, Physical Activity (PA) and Motivation for Exercise.
Data sources: Search through electronic databases PubMed, MEDLINE, SPORTDiscus, CINAHL, MEDICLATINA, COCHRANE and Web of Science, was carried out during March 2019, considering only studies since 2008.
Study eligibility criteria: (i) applied to adolescents aged 10-19 years, (ii) HIIT program is applied in a school environment, (iii) outcomes report on physical condition, PA and motivation for exercise (iv) the intervention is at least 4 weeks, (v) randomized controlled trials (RCT). Results: of the 5872 studies found a total of 14 studies were included in the review. All works present significant improvements in, at least, 2 of the dimensions evaluated: physical condition and PA. There does not seem to be any great advantage in protocols that last in total more than 10 minutes per session. Improvements in body composition registered, at most, a moderate Effect Size. HIIT is presented as a powerful stimulus in improving physical fitness, mainly on CRF in most protocols, and in power and speed when modality is plyometries. Improvements in PA registered a moderate and large Effect Size.
Conclusions: This review suggests that the introduction of HIIT in the school context has great potential in improving physical fitness and PA, and a moderate effect on improving body composition in adolescents. HIIT efficiency (on average about 10 minutes), reflect the wide applicability that these protocols can have in PE classes, and great adaptation to the facilities (including classrooms).
Registration Number: CRD42019138771

Keywords: HIIT, Sedentary Behaviour, fitness, health.

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