Publication details

Acute caffeine supplementation improves jumping, sprinting, and change-of-direction performance in basketball players when ingested in the morning but not evening

Authors

STOJANOVIČ Emilija SCANLAN Aaron MILANOVIC Zoran FOX Jordan STANKOVIČ Radko DALBO Vincent

Year of publication 2021
Type Article in Periodical
Magazine / Source European Journal of Sport Science
MU Faculty or unit

Faculty of Sports Studies

Citation
Web https://www.tandfonline.com/doi/full/10.1080/17461391.2021.1874059?scroll=top&needAccess=true
Doi http://dx.doi.org/10.1080/17461391.2021.1874059
Keywords Diurnal variation; sport; anaerobic performance; time-of-day; ergogenic aids; power
Description This study compared the effects of acute caffeine supplementation (3 mg/kg) administered in the morning and evening on performance-related variables in basketball players. Eleven, national-level, adolescent male basketball players underwent field-based fitness testing on four occasions: morning (10:00) with caffeine ingestion (AMCAFF), morning (10:00) with placebo ingestion (AMPLAC), evening (21:00) with caffeine ingestion (PMCAFF), and evening (21:00) with placebo ingestion (PMPLAC). Fitness testing included of a countermovement jump without arm swing (CMJ), CMJ with arm swing (CMJAS), squat jump (SJ), Lane Agility Drill (LAD), 20-m linear sprint, and Suicide Run with (SRD) and without dribbling (SR). Data were analysed using two-way repeated measures analyses of variance and paired t-tests, with effect sizes (ES) also determined for all pairwise comparisons. Follow-up t-test comparisons revealed that AMCAFF produced small-moderate, significant (p<0.001), improvements in CMJ (ES?=?0.51), CMJAS (ES?=?0.40), SJ (ES?=?0.51), and SR (ES?=?-0.45) compared to AMPLAC. AMCAFF also produced a moderate, significantly (p<0.001) faster LAD (ES?=?-0.61) compared to PMCAFF. PMPLAC demonstrated small-moderate, significant (p<0.05) improvements in CMJ (ES?=?0.43), CMJAS (ES?=?0.48), and 20-m sprint (ES?=?-0.63) compared to AMPLAC. In contrast, AMPLAC resulted in large, significantly (p<0.001), faster SRD (ES?=?-1.46) and SR (ES?=?-1.59) compared to PMPLAC. Given the ergogenic effects of caffeine during basketball-specific fitness tests appear to be influenced by time of ingestion, basketball practitioners should consider administering caffeine only to players in the morning to improve vertical jump, sprinting, and change-of-direction performance, with no beneficial effects observed with caffeine ingestion in the evening.

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