ArticleBMC sports science, medicine & rehabilitation2026
Comparison of the effects of aquatic HIIT and MICT on central hemodynamics, endothelial function, and aerobic fitness in obese school-aged children: a randomized controlled trial.
Article in BMC sports science, medicine & rehabilitation, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundAquatic exercise may be a feasible strategy for improving cardiovascular health in children with obesity, but evidence comparing aquatic high-intensity interval training (aHIIT) and aquatic moderate-intensity continuous training (aMICT) remains limited. This pilot randomized controlled trial compared the effects of 8 weeks of aHIIT and aMICT on endothelial function, estimated cardiorespiratory fitness, central hemodynamic indices, arterial stiffness, and anthropometric indicators in school-aged children with obesity.
methodsThirty-three children with obesity were randomized to the aHIIT group (n = 11), aMICT group (n = 11), or non-exercise control group (n = 11). The two aquatic exercise groups trained 3 days/week for 8 weeks. The aHIIT protocol consisted of 10 × 30-s high-intensity aquatic exercise (such as freestyle swimming or freestyle kicking) bouts at 80%-90% HRmax, separated by 60-s recovery intervals, whereas the aMICT protocol consisted of two 15-min continuous breaststroke bouts at 60%-70% HRmax, separated by a 5-min recovery interval. Brachial artery flow-mediated dilation (FMD) was used as the principal vascular outcome. Central hemodynamic indices were assessed using applanation tonometry, and estimated VO
resultsSignificant group × time interactions were observed for estimated VO
conclusionThis pilot trial suggests that both aHIIT and aMICT may improve estimated cardiorespiratory fitness in school-aged children with obesity. aHIIT may be associated with greater improvement in brachial artery endothelial function, whereas aMICT may have favorable effects on selected wave-reflection-related indices. However, these findings should be interpreted cautiously because of the small sample size, indirect estimated VO
trial registrationChinese Clinical Trial Registration, ChiCTR2400080687.05/02/2024.
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