Table 1. Mean (±SD) performance times (s) in a 6 x 75 m maximal freestyle sprint protocol after supplementation of placebo or caffeine in national level swimmers (n = 9).
Sprint
Number |
Placebo |
Caffeine * |
Effect Size
(d) |
| 1 |
40.24 (1.22) |
39.88 (.74) |
.36 |
| 2 |
40.30 (1.16) |
39.94 (1.18) |
.31 |
| 3 |
40.70 (1.00) |
39.70 (.96) |
1.02 § |
| 4 |
40.98 (1.02) |
40.14 (.98) |
.84 § |
| 5 |
40.68 (1.26) |
40.20 (1.42) |
.36 |
| 6 |
40.60 (1.30) |
40.48 (1.70) |
.09 |
| Mean |
40.58 (1.08) |
40.06 (1.02) |
050 # |
* Denotes significant treatment effect (α=0.05).§ Denotes large effect (d >0.80).
# Denotes moderate effect (d >0.50).
