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Table 5 Summary of comparisons between caffeine consumers and non-consumers among study participants in SJFT

From: Dose-dependent effect of caffeine supplementation on judo-specific performance and training activity: a randomized placebo-controlled crossover trial

Indicator Baseline 3 mg/kg 6 mg/kg
n = 22
9 mg/kg Placebo
Total number of throws in SJFT
t 0.70 1.47 1.31 0.08 −0.23
P 0.49 0.16 0.21 0.94 0.82
d 0.30 0.63 0.56 0.03 −0.10
HR immediately after SJFT (HRRA)
t −1.80 −1.63 −0.52 −0.42 −1.83
P 0.09 0.12 0.61 0.68 0.08
d −0.77 −0.70 −0.22 − 0.18 −0.78
HR 1 min after SJFT (HR1minAF)
t* −1.94 −2.36 −0.99 −1.84 − 1.93
P 0.07 0.03 0.33 0.08 0.07
d −0.83 −1.01 − 0.43 − 0.79 −0.83
  1. Values are t-score (t), P-value and Cohen’s d. SJFT, Special Judo Fitness Test; HR, heart rate