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
Sun J, Wang M, Chen L, Li J, Zhou Y, Li M, Chen M, Leng J, Mieryazi A, Zhang J, Wang Y, Li X, Zhang B, Li L, Zhang Y, Wang J
Nutrients · 0 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
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- Resultado principal
- Marcadores de salud y funcionamiento
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- Financiación independiente
Según la declaración de financiación del texto completo.
Publicación
- Publicado
- 2026-08-29 · Nutrients · vol. 18 · número 17 · pág. 2842
- Editorial
- Multidisciplinary Digital Publishing Institute
- Citado
- 0 citas · más que el 68% de estudios similares · 0.0× el promedio de su campo
- Referencias
- 45 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Sports Performance and Training · Coffee research and impacts · Exercise and Physiological Responses
- Palabras clave
- caffeine supplementation, countermovement jump, drop jump, reactive strength index, basketball players, acute caffeine effects, jump performance, caffeine tolerance, caffeine sensitivity, caffeine resistance, caffeine dose-response, caffeine withdrawal
- MeSH
- humans, caffeine, cross-over studies, double-blind method, basketball, adult, china, male, muscle strength, athletic performance, young adult, plyometric exercise, east asian people
16 autores
- Jiaxuan Sun🇨🇳Beijing Sport University
- Mingrui Wang🇨🇳 · autor de correspondenciaGeneral Administration of Sport of China; Beijing Sport University
- Lun Chen
- Jinda Li🇨🇳Beijing Sport University
- Yuting Zhou🇨🇳Beijing Sport University
- Mingze Li🇨🇳Beijing Sport University
- Ming Chen🇨🇳Beijing Sport University
- Jingzhi Leng🇨🇳Beijing Sport University
- Apudumalike Mieryazi🇨🇳Beijing Sport University
- Jiahao Zhang🇨🇳Beijing Sport University
- Yena Wang🇨🇳Linyi University
- Xiupeng Li🇨🇳Shaanxi Normal University
- Bing Zhang🇨🇳Tsinghua University
- Li Li🇨🇳General Administration of Sport of China; Beijing Sport University
- Yimin Zhang🇨🇳Beijing Sport University
- Jun Wang🇨🇳General Administration of Sport of China; Beijing Sport University
Resumen
El texto original del estudio, en el idioma en que se publicó.
Background/Objectives: Whether caffeine provides additional benefit when superimposed on individualized plyometric conditioning remains unclear. We examined whether 3 mg·kg-1 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, 21.0-27.75]) 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·kg-1) or placebo (PLA), a 60-min absorption period, and warm-up, participants performed a post-supplement, pre-conditioning CMJ followed by 3 × 5 DJs. CMJ was assessed at 15 s, 3, 6, 9, and 12 min. The primary outcome was the Condition × 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 p = 0.305). CAF-PLA differences at 15 s, 3, 6, 9, and 12 min were 0.89 cm (95% CI, -0.11 to 1.88), 0.39 (-0.61 to 1.38), 0.21 (-0.79 to 1.21), 0.84 (-0.15 to 1.84), and 0.71 (-0.29 to 1.71), respectively (all Holm-adjusted p ≥ 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, 0.74-2.92; Holm-adjusted p = 0.031) but was exploratory. RPE showed no Condition × Time interaction (p = 0.253); at 15 s, CAF-PLA was -0.60 points (95% CI, -1.09 to -0.12; Holm-adjusted p = 0.088). Conclusions: This study did not obtain clear evidence that 3 mg·kg-1 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.
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