Effect of cluster set resistance training combined with high-intensity interval training on cardiorespiratory and muscular fitness in untrained young men

Objective This study aims to investigate the impact of cluster set resistance training combined with high-intensity interval training (CSRT-HIIT) on the body composition, cardiovascular and muscular fitness of untrained young men. Methods Twenty-two participants were randomly assigned to the CSRT-HIIT or traditional resistance training combined with high-intensity interval training (TRT-HIIT). Both groups had cardiorespiratory and muscular fitness measured before and after the intervention. Results Compared to the baseline, significant increases were observed in the 1RM weights for squat, bench press, deadlift, and rowing, as well as the maximum training volume at 70% 1RM, maximum oxygen uptake, standing long jump, and the thickness of the pectoralis major, biceps brachii, and rectus femoris in both the CSRT-HIIT and TRT-HIIT groups after the intervention, with a significant decrease in body fat percentage ( P < 0.05). No statistically significant differences were found between the groups for these variables ( P > 0.05). Conclusion Twelve weeks of both CSRT-HIIT and TRT-HIIT significantly improved cardiorespiratory and muscular fitness in untrained young men, demonstrating that the novel CSRT-HIIT is an equally effective alternative to traditional TRT-HIIT.