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Each group performed 5 exercises at maximal effort with differences in volume: low (3 sets of 7 repetitions), moderate (3 sets of 10 repetitions), and high (3 sets of 13 repetitions). The training program lasted 6\u00a0weeks with participants undertaking 3 sessions of PT per week. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Following the intervention, all groups exhibited significant (<jats:italic>P<\/jats:italic>\u2009=\u2009.001) improvements in physical and physiological parameters, as well as skill-based performances, with effect sizes ranging from small to very large. Comparative analysis of individual changes indicated that the high-volume group resulted in greater adaptive responses in the medicine-ball throw (<jats:italic>P<\/jats:italic>\u2009=\u2009.004), peak (<jats:italic>P<\/jats:italic>\u2009=\u2009.001) and average (<jats:italic>P<\/jats:italic>\u2009=\u2009.022) power output, push-ups (<jats:italic>P<\/jats:italic>\u2009=\u2009.001), and strength (<jats:italic>P<\/jats:italic>\u2009=\u2009.032) compared with the low-volume group. No significant between-groups difference (<jats:italic>P<\/jats:italic>\u2009&gt;\u2009.05) was observed regarding immunoendocrine measures, reaction time, attacking, and serving skills. <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> The findings indicate that short-term upper-body PT positively influenced performance adaptations, emphasizing that the adaptive response to PT depends on the varying volumes. The study proposes that integrating higher volumes of PT results in more significant adaptive responses among volleyball players with the same immunoendocrine responses as the other training volumes.<\/jats:p>","DOI":"10.1123\/ijspp.2024-0229","type":"journal-article","created":{"date-parts":[[2025,1,13]],"date-time":"2025-01-13T19:41:53Z","timestamp":1736797313000},"page":"363-371","source":"Crossref","is-referenced-by-count":12,"title":["Selected Immunoendocrine and Physiological Performance Adaptations to Different Volume of Upper-Body Plyometric Training in National-Level Male Volleyball Players"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-0057-179X","authenticated-orcid":true,"given":"Changfeng","family":"Ning","sequence":"first","affiliation":[{"name":"Institute of Physical Education, Yancheng Institute of Technology, Yancheng, JS, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0819-4391","authenticated-orcid":true,"given":"Mohsen","family":"Sheykhlouvand","sequence":"additional","affiliation":[{"name":"Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, University of Guilan, Rasht, Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"3","key":"r1","series-title":"Int J Sports Physiol Perform","doi-asserted-by":"publisher","first-page":"292","DOI":"10.1123\/ijspp.2.3.292","article-title":"Development of a repeated-effort test for elite men\u2019s volleyball","volume":"2","author":"Sheppard JM","year":"2007","unstructured":"Sheppard JM, Gabbett T, Taylor KL, Dorman J, Lebedew AJ, Borgeaud R. 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