4.3 ± 6.9% with any other alternative intervention. Although the mean ES for changes in VO 2peak with HIIT is small (mean g = 0.10☐.28), the average increase in VO 2peak from pre to post HIIT-interventions were 7.2 ± 6.9% vs. HIIT exerted no or small positive mean ES on peak oxygen uptake (VO 2peak), running performance, repeated sprint ability, jumping performance and submaximal heart rate. Results: Twenty four studies, involving 577 athletes (mean age: 15.5 ± 2.2 years), were included in this review. Hedges' g effect size (ES), and associated 95% confidence intervals were calculated for comparison of any outcome between experimental (HIIT) and alternative training protocol. alternative training protocol) with pre-post design (ii) healthy young athletes (≤18 years) (iii) assessing variables related to endurance and exercise performance. Inclusion criteria were: (i) controlled trials (HIIT vs. Method: Relevant articles published in peer-reviewed journals were retrieved from the electronic databases PubMed and SPORTDiscus in December 2017. ![]() Objectives: To assess original research about enhancement of endurance and anaerobic exercise performance in young and adolescent athletes performing HIIT. ![]()
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