Table 2.

Likert scale values (mean ± SD) for the psychological variables among supplement conditions at the 30-min time point of exercise (n = 12).

	Preworkout	Caffeine	Placebo
Baseline
Energy	2.8 ± 0.7	2.8 ± 0.9	2.6 ± 0.9
Fatigue	2.2 ± 0.9	2.3 ± 0.8	2.0 ± 0.7
Alertness	3.1 ± 0.7	2.8 ± 0.8	2.8 ± 1.0
Focus	3.3 ± 0.6	3.2 ± 0.8	3.0 ± 1.0
30-Min Postingestion
Energy	3.6 ± 0.7	3.3 ± 0.7	3.0 ± 0.7
Fatigue	2.2 ± 0.9	2.0 ± 0.7	2.0 ± 0.7
Alertness	4.0 ± 0.7 *	3.6 ± 0.9	3.5 ± 1.2
Focus	4.2 ± 0.7 *	3.8 ± 0.9	3.3 ± 0.6
Exercise
Energy	3.8 ± 0.6	3.7 ± 0.8	3.5 ± 0.8
Fatigue	2.0 ± 0.9 *	2.3 ± 1.0	2.5 ± 0.8
Alertness	4.0 ± 0.7	3.6 ± 0.9	3.5 ± 1.2
Focus	4.3 ± 0.8	3.8 ± 0.9	3.8 ± 1.2

* Significantly (p < 0.05) different than placebo conditions.