Table 1 Mean (± SD) concentric knee flexor and extensor strength and power parameters for caffeine (CAFF) and placebo (PLA) trials before, during and after the 90-min intermittent exercise protocol (n = 10)
From: The influence of caffeine ingestion on strength and power performance in female team-sport players
Sample time | Cohen’s d (Trial Mean) | Statistical significance (P values) | |||||||
|---|---|---|---|---|---|---|---|---|---|
Pre | Mid | Post | ~12 h post | Trial Mean | Treatment | Time | Treatment x Time | ||
Average torque (Nm) | |||||||||
Concentric knee flexor | |||||||||
PLA | 79.7 ± 21.2 | 77.9 ± 23.4 | 77.1 ± 20.8 | 76.0 ± 18.8 | 77.6 ± 20.3 | 0.11 | 0.327 | 0.920 | 0.222 |
CAFF | 75.9 ± 19.8 | 80.6 ± 17.3 | 80.2 ± 20.1 | 82.4 ± 19.1 | 79.8 ± 18.5 | ||||
Concentric knee extensor | |||||||||
PLA | 104.4 ± 34.6 | 105.0 ± 35.7 | 111.8 ± 43.2 | 102.6 ± 32.7 | 106.0 ± 35.5 | 0.29 | 0.053 | 0.678 | 0.257 |
CAFF | 112.6 ± 45.3 | 115.7 ± 33.7 | 114.4 ± 32.3 | 124.2 ± 43.2 | 116.8 ± 37.8 | ||||
Average power (Watts) | |||||||||
Concentric knee flexor | |||||||||
PLA | 25.7 ± 7.5 | 23.7 ± 6.5 | 24.0 ± 7.1 | 24.6 ± 6.2 | 24.5 ± 6.6 | 0.11 | 0.274 | 0.076 | 0.385 |
CAFF | 24.8 ± 7.1 | 24.5 ± 7.4 | 24.5 ± 5.8 | 26.9 ± 6.8 | 25.2 ± 6.6 | ||||
Concentric knee extensor | |||||||||
PLA | 24.3 ± 8.7 | 23.8 ± 9.0 | 25.5 ± 9.2 | 23.5 ± 7.6 | 24.3 ± 8.4 | 0.23 | 0.151 | 0.372 | 0.069 |
CAFF | 23.1 ± 8.0 | 26.7 ± 8.0 | 27.0 ± 8.1 | 28.2 ± 9.6 | 26.2 ± 8.3 | ||||