ArticleBMC sports science, medicine & rehabilitation2025
Eight weeks equivalent-volume RT and HIIT performed within same session or alternated weekly: comparative effects on physiological adaptations in young adult males.
Article in BMC sports science, medicine & rehabilitation, 2025. 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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5 authors.
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Abstract
backgroundThis study aims to investigate the effects of 8 weeks equivalent-volume resistance training (RT) and high-intensity interval training (HIIT) performed within same session or alternated weekly on body composition, cardiorespiratory function, and muscular fitness in young adult males.
methodsTwenty-three young adult males were randomly assigned to either the A group (RT and HIIT performed within the same session, n = 11) or the B group (RT and HIIT were alternated weekly, n = 12). Body composition, cardiorespiratory function, and muscular fitness were assessed at baseline (T1), the fifth week (T2), and the ninth week (T3). Baseline differences and training effects were analyzed using independent sample t-tests and repeated measures ANOVA, respectively.
resultsNo significant group differences were found at baseline (P > 0.05). Post-intervention, body fat percentage, skeletal muscle mass, and thickness significantly improved over time (P < 0.05), but no significant group or interaction effects. Maximum power output significantly increased at T2 and T3 compared to T1 (P < 0.05), while VO₂max, METs, and Maximum Minute Ventilation significantly increased only at T3 compared to T1 (P < 0.05), with no significant group or interaction effects. Both groups showed significant improvements in maximal strength during the intervention (P < 0.05). Endurance repetitions, particularly in the squat exercise, showed significant improvement initially (P < 0.05), followed by a downward trend, and no significant group or interaction effects were found.
conclusionsConcurrent training, whether performed within the same session or alternated weekly, elicited comparable improvements in body composition, cardiorespiratory, and muscular outcomes in young adult males. Both arrangements promoted beneficial adaptations, indicating flexibility in concurrent training design.
trial registrationThe study was retrospectively registered on 24 June 2025 at www.chictr.org.cn with identification number ChiCTR2500104848.
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