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  • Title: High-Intensity Interval Training and Cardiometabolic Risk Factors in Children: A Meta-analysis.
    Author: Solera-Martínez M, Herraiz-Adillo Á, Manzanares-Domínguez I, De La Cruz LL, Martínez-Vizcaíno V, Pozuelo-Carrascosa DP.
    Journal: Pediatrics; 2021 Oct; 148(4):. PubMed ID: 34497117.
    Abstract:
    CONTEXT: High-intensity interval training (HIIT) has been widely used to prevent and treat cardiovascular risk factors in adolescents and adults; nevertheless, the available evidence in children is scarce. OBJECTIVE: To synthesize evidence regarding the effectiveness of HIIT interventions on improving cardiovascular risk factors and cardiorespiratory fitness (CRF) in children from 5 to 12 years old. DATA SOURCES: We searched 5 databases, Medline, Embase, SPORTDiscus, the Cochrane Library, and Web of Science. STUDY SELECTION: Randomized controlled trials (RCTs) evaluating the effectiveness of HIIT interventions on cardiometabolic risk factors and CRF in children were included. DATA EXTRACTION: Meta-analyses were conducted to determine the effect of HIIT on body composition, cardiometabolic and CRF variables in comparison with nontraining control groups. RESULTS: A total of 11 RCTs and 512 participants were included. The results of the meta-analysis revealed a significant improvement in peak oxygen uptake (standardized mean difference [SMD] = 0.70, 95% confidence interval [CI] = 0.28 to 1.12; P = 0.001], in total cholesterol [SMD = -1.09, 95% CI = -1.88 to -0.30; P = 0.007], in low-density lipoprotein cholesterol [SMD = -1.28, 95% CI = -2.34 to -0.23; P = 0.017] and triglycerides [SMD = -0.71, 95% CI = -1.15 to -0.28; P = 0.001) levels. LIMITATIONS: Because of the small number of available RCTs, it was not possible to conduct a subgroup analysis or a linear meta-regression analysis. CONCLUSIONS: HIIT is a feasible and time-efficient approach for improving CRF, total cholesterol, low-density lipoprotein cholesterol, and triglycerides levels in children.
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