{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,2]],"date-time":"2026-06-02T03:06:58Z","timestamp":1780369618176,"version":"3.54.1"},"reference-count":37,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T00:00:00Z","timestamp":1766102400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Emerging Interdisciplinary Platform for Medicine and Engineering in Sports"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>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.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>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.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      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 (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; 0.05). No statistically significant differences were found between the groups for these variables (\n                      <jats:italic>P<\/jats:italic>\n                      &gt; 0.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>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.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.7717\/peerj.20492","type":"journal-article","created":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T08:45:21Z","timestamp":1766133921000},"page":"e20492","source":"Crossref","is-referenced-by-count":2,"title":["Effect of cluster set resistance training combined with high-intensity interval training on cardiorespiratory and muscular fitness in 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