Absolute changes in performance indices after six days of creatine loading
| Creatine (n = 24) | Placebo (n = 12) | p Value | |||
|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||
| The differences between the two groups were compared using analysis of variance for repeated measurements, with the baseline score as a covariate. The p values for the group comparisons are shown. | |||||
| RPE, rate of perceived exertion. | |||||
| Strength test | |||||
| Bench press (newton, mean) | 35 | 79 | 10 | 40 | 0.31 |
| Bench press (newton, best) | 21 | 73 | −5 | 56 | 0.27 |
| Leg press (newton, mean) | −70 | 641 | 315 | 599 | 0.87 |
| Leg press (newton, best) | −119 | 729 | −101 | 548 | 0.62 |
| Sprint test | |||||
| 5 m sprint time (s) | −0.01 | 0.02 | −0.01 | 0.03 | 0.99 |
| 10 m sprint time (s) | 0.01 | 0.07 | 0.05 | 0.11 | 0.48 |
| 20 m sprint time (s) | 0.01 | 0.07 | 0.06 | 0.12 | 0.25 |
| Serum lactate post (mmol/l) | −0.1 | 1.0 | −0.4 | 0.6 | 0.48 |
| RPE post | −1.2 | 1.3 | 0.2 | 1.6 | 0.11 |
| Tennis test | |||||
| Service (km/h, mean) | 2 | 6 | 2 | 6 | 0.90 |
| Service (km/h, best) | 1 | 5 | 1 | 6 | 0.91 |
| Forehand (km/h, mean) | 4 | 4 | 4 | 5 | 0.80 |
| Forehand (km/h, best) | 6 | 5 | 6 | 12 | 0.95 |
| Backhand (km/h, mean) | 3 | 5 | 1 | 4 | 0.38 |
| Backhand (km/h, best) | 3 | 4 | −2 | 7 | 0.065 |
| Serum lactate post (mmol/l) | −1.0 | 1.3 | −0.1 | 1.5 | 0.06 |
| RPE post | −0.5 | 2.2 | 0.0 | 1.1 | 0.45 |