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).