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Updated: Jan 20, 2026

A Real-World High-Intensity Interval Training Protocol for Cardiorespiratory Fitness Improvement
Published on: February 22, 2022
Response of obese schoolchildren to high-intensity interval training applied in the school context
Miguel Espinoza-Silva1, Pedro Ángel Latorre-Román2, Juan Párraga-Montilla2
1Departamento de Educación Física, Deportes y Recreación, Universidad de La Frontera, Temuco, Chile.
Background:
High-intensity interval training (HIIT) has been widely used to fight cardiovascular risk factors in adolescents and adults, but no data are available on its applicability in children.
Objectives:
To assess the effects of HIIT on different anthropometric and cardiovascular parameters of overweight and obese children aged 7-9 years.
Material And Methods:
Four groups were formed: 1) an overweight control group (OWCG, n=30, BMI=21.60±3.72kg/m2); 2) an obesity control group (OCG, n=34, BMI=23.92±3.11kg/m2); 3) an overweight intervention group (OWIG, n=69, BMI=20.01±1.88kg/m2), and 4) an obesity intervention group (OIG, n=141, BMI=24.12±2.66kg/m2). BMI, body fat (BF), waist circumference, height-waist ratio, systolic and diastolic blood pressure and cardiorespiratory fitness (CRF) were assessed before and after intervention.
Results:
There were significant differences in BMI (P<.001), BF (P<.001), and CRF (P<.001) between the groups (control vs. intervention) before and after intervention (OWCG vs. OWIG and OCG vs. OIG). BMI decreased in the OWIG (BMI, 20.01±1.88 at baseline vs. 19.00±2.02 after HIIT, P<.001) and OIG (BMI, 24.12±2.66 at baseline vs. 23.23±3.23 after HIIT, P<.001) groups. Similarly, BF decreased in the OWIG (BF, 21.84±4.97 at baseline vs. 19.55±4.81% after HIIT, P<.001) and OIG (BF, 30.26±11.49 at baseline vs. 26.81±6.80% after HIIT, P<.001) groups. CRF improved in both intervention groups (P<.001). There was a significant decrease in the prevalence rate of schoolchildren with obesity (from 66.4% to 49.6%) (P<.001).
Conclusion:
The intervention conducted in the school setting improved the anthropometric and cardiovascular parameters of schoolchildren, and also allowed for reducing the proportion of schoolchildren with obesity.
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