Table 2 Special Judo Fitness Test (SJFT) data analysis
All | Caffeine consumers | Caffeine non-consumers | Uor t | P | rg or d | |
|---|---|---|---|---|---|---|
n = 22 | n = 10 | n = 12 | ||||
SJFTR1 | ||||||
Baseline | 5.3 (0.7)a | 5.1 (0.9)a | 5.5 (0.5)a | 45.0 | 0.34 | 0.25 |
3 mg/kg | 5.6 (0.6)ab | 5.7 (0.5)b | 5.6 (0.7)ab | 51.5 | 0.60 | −0.14 |
6 mg/kg | 5.9 (0.6)bc | 5.7 (0.5)ab | 6.0 (0.6)b | 45.0 | 0.34 | 0.25 |
9 mg/kg | 6.0 (0.6)c | 6.0 (0.5)b | 6.0 (0.7)b | 60.0 | 0.97 | 0.00 |
Placebo | 5.6 (0.6)ab | 5.6 (0.5)ab | 5.6 (0.7)ab | 57.0 | 0.87 | −0.05 |
Χ2 | 21.46 | 12.85 | 11.67 | |||
P | < 0.001 | 0.01 | 0.02 | |||
Kendall’s W | 0.24 | 0.32 | 0.24 | |||
SJFTR2 | ||||||
Baseline | 10.0 (1.2)B | 9.9 (1.3)A | 10.1 (1.1)B | 0.36 | 0.72 | 0.16 |
3 mg/kg | 10.1 (1.0)B | 9.9 (1.1)B | 10.3 (1.0)A | 0.98 | 0.34 | 0.42 |
6 mg/kg | 10.4 (0.8)B | 10.2 (0.6)A | 10.5 (1.0)A | 49.0 | 0.49 | 0.18 |
9 mg/kg | 10.5 (0.8)A | 10.7 (0.7)A | 10.3 (0.9)A | 41.0 | 0.22 | −0.32 |
Placebo | 10.3 (0.9)B | 10.3 (0.8)B | 10.3 (1.0)B | 57.0 | 0.87 | −0.05 |
Χ2 or F | 6.93 | 6.84 | 0.97 | |||
P | 0.14 | 0.14 | 0.43 | |||
Kendall’s W or \( {\eta}_p^2 \) | 0.08 | 0.17 | 0.08 | |||
SJFTR3 | ||||||
Baseline | 9.2 (1.3)aA | 9.1 (1.4)A | 9.3 (1.2)A | 0.42 | 0.68 | 0.18 |
3 mg/kg | 9.5 (1.0)aA | 8.9 (0.9)A | 9.9 (0.9)A | 26.0 | 0.03 | 0.57 |
6 mg/kg | 9.9 (1.1)bA | 9.6 (1.0)A | 10.2 (1.1)A | 43.5 | 0.22 | 0.28 |
9 mg/kg | 10.2 (1.1)bA | 9.9 (1.1)A | 10.4 (1.0)A | 42.0 | 0.25 | 0.30 |
Placebo | 9.4 (1.1)aA | 9.5 (1.1)A | 9.3 (1.2)A | 55.0 | 0.77 | −0.08 |
Χ2 | 19.58 | 6.79 | 19.93 | – | – | – |
P | 0.006 | 0.15 | < 0.001 | – | – | – |
Kendall’s W | 0.22 | 0.17 | 0.42 | – | – | – |
SJFT Index | ||||||
Baseline | 13.2 (2.2) | 13.9 (2.3) | 12.6 (2.0) | – | – | – |
3 mg/kg | 12.7 (1.8) | 13.5 (1.9) | 12.0 (1.4) | – | – | – |
6 mg/kg | 12.6 (1.4) | 13.1 (1.2) | 12.3 (1.4) | – | – | – |
9 mg/kg | 12.5 (1.3) | 12.7 (1.3) | 12.3 (1.3) | – | – | – |
Placebo | 12.6 (1.7) | 13.0 (1.4) | 12.2 (1.9) | – | – | – |
Dosage effect | ||||||
F | 2.38 | – | – | |||
P | 0.06 | – | – | |||
\( {\eta}_p^2 \) | 0.10 | – | – | |||
Dosage x caffeine consumption effect | ||||||
F | 1.51 | – | – | |||
P | 0.21 | – | – | |||
\( {\eta}_p^2 \) | 0.07 | – | – | |||
Statistical significance between SJFTR2 and SJFTR3 within the same caffeine dosage | ||||||
Z or t (Baseline) | 2.56 | 1.56 | 3.00 | – | – | – |
P | 0.01 | 0.15 | 0.01 | – | – | – |
rc or d | 0.66 | 0.60 | 0.65 | – | – | – |
Z or t (3 mg/kg) | 2.83 | 2.37 | 1.57 | – | – | – |
P | 0.005 | 0.02 | 0.12 | – | – | – |
rc or d | 0.79 | 0.89 | 0.64 | – | – | – |
Z or t(6 mg/kg) | 2.13 | 1.52 | 1.83 | – | – | – |
P | 0.03 | 0.14 | 0.07 | – | – | – |
rc or d | 0.64 | 0.57 | 0.66 | – | – | – |
Z or t (9 mg/kg) | 1.13 | 1.84 | −0.69 | – | – | – |
P | 0.26 | 0.07 | 0.50 | – | – | – |
rc or d | 0.30 | 0.61 | −0.18 | – | – | – |
Z or t (Placebo) | 3.29 | 2.03 | 2.67 | – | – | – |
P | 0.001 | 0.04 | 0.008 | – | – | – |
rc or d | 0.80 | 0.72 | 0.89 | – | – | – |