{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T05:20:53Z","timestamp":1788153653977,"version":"build-2803163510"},"reference-count":48,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2026,8,29]],"date-time":"2026-08-29T00:00:00Z","timestamp":1787961600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Background\/Objectives: Whether caffeine provides additional benefit when superimposed on individualized plyometric conditioning remains unclear. We examined whether 3 mg\u00b7kg\u22121 caffeine altered the temporal countermovement jump (CMJ) response following reactive strength index (RSI)-derived individualized drop-jump (DJ) conditioning and explored moderation by habitual caffeine exposure. Methods: Thirty Chinese Han male basketball players (median age, 22.0 years [IQR, 21.0\u201327.75]) entered a randomized, double-blind, placebo-controlled crossover trial; 17 reported no caffeine exposure and 13 reported exposure during the preceding 4 weeks. After caffeine (CAF; 3 mg\u00b7kg\u22121) or placebo (PLA), a 60-min absorption period, and warm-up, participants performed a post-supplement, pre-conditioning CMJ followed by 3 \u00d7 5 DJs. CMJ was assessed at 15 s, 3, 6, 9, and 12 min. The primary outcome was the Condition \u00d7 Time effect on CMJ. All 30 randomized participants contributed data; three did not complete Period 2 because readiness criteria were not met, but Period 1 data were retained (57 participant-period observations). Results: CMJ varied across time (p &lt; 0.001), but Condition \u00d7 Time was not significant (p = 0.305). CAF\u2013PLA differences at 15 s, 3, 6, 9, and 12 min were 0.89 cm (95% CI, \u22120.11 to 1.88), 0.39 (\u22120.61 to 1.38), 0.21 (\u22120.79 to 1.21), 0.84 (\u22120.15 to 1.84), and 0.71 (\u22120.29 to 1.71), respectively (all Holm-adjusted p \u2265 0.399). Habitual caffeine exposure showed no global moderation continuously (p = 0.158) or categorically (p = 0.116). An isolated 9-min contrast at zero reported exposure favored CAF by 1.83 cm (95% CI, 0.74\u20132.92; Holm-adjusted p = 0.031) but was exploratory. RPE showed no Condition \u00d7 Time interaction (p = 0.253); at 15 s, CAF\u2013PLA was \u22120.60 points (95% CI, \u22121.09 to \u22120.12; Holm-adjusted p = 0.088). Conclusions: This study did not obtain clear evidence that 3 mg\u00b7kg\u22121 caffeine provided additional CMJ improvement following this specific RSI-derived individualized DJ protocol. Habitual caffeine exposure did not systematically moderate the temporal response; the isolated signal was exploratory.<\/jats:p>","DOI":"10.3390\/nu18172842","type":"journal-article","created":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T04:24:03Z","timestamp":1788150243000},"page":"2842","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Does Acute Caffeine Alter the Temporal Countermovement Jump Response Following Reactive Strength Index-Individualized Drop Jumps in Chinese Han Basketball Players with Different Habitual Caffeine Exposure? A Randomized, Double-Blind, Placebo-Controlled Crossover Trial"],"prefix":"10.3390","volume":"18","author":[{"given":"Jiaxuan","family":"Sun","sequence":"first","affiliation":[{"name":"Department of Exercise Physiology, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"software","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-6839-2270","authenticated-orcid":false,"given":"Mingrui","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Exercise Physiology, Beijing Sport University, Beijing 100084, China"},{"name":"Laboratory of Sports Stress and Adaptation, General Administration of Sport of China, Beijing Sport University, Beijing 100084, 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100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Yuting","family":"Zhou","sequence":"additional","affiliation":[{"name":"China Volleyball College, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Mingze","family":"Li","sequence":"additional","affiliation":[{"name":"Sports Coaching College, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Ming","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Strength and Conditioning, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-0359-4056","authenticated-orcid":false,"given":"Jingzhi","family":"Leng","sequence":"additional","affiliation":[{"name":"School of Sport Science, Key Laboratory of Sports and Physical Fitness of the Ministry of Education, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Apudumalike","family":"Mieryazi","sequence":"additional","affiliation":[{"name":"Department of Exercise Physiology, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Jiahao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Exercise Physiology, Beijing Sport University, Beijing 100084, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-7825-5765","authenticated-orcid":false,"given":"Yena","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Physical Education and Health, Linyi University, Linyi 276000, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"investigation","vocabulary":"credit"}]},{"given":"Xiupeng","family":"Li","sequence":"additional","affiliation":[{"name":"School of Physical Education, Shaanxi Normal University, Xi\u2019an 710119, China"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"validation","vocabulary":"credit"}]},{"given":"Bing","family":"Zhang","sequence":"additional","affiliation":[{"name":"Division of Sports Science and Physical Education, Tsinghua University, Beijing 100084, 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