Table 3.
Placebo | Caffeine | Placebo | Caffeine | |
---|---|---|---|---|
Immediately After Testing Session | Immediately After Testing Session | Morning After Testing Session | Morning After Testing Session | |
Muscle soreness | 0 | 0 | 0 | 0 |
Increased urine production | 0 | 6 | 0 | 6 |
Tachycardia and heart palpitations | 6 | 12 | 0 | 0 |
Increased anxiety | 0 | 18 | 0 | 0 |
Headache | 0 | 0 | 0 | 0 |
Abdominal/gut discomfort | 0 | 6 | 0 | 0 |
Insomnia | n/a | n/a | 0 | 6 |
Increased vigor/activeness | 12 | 41 | 0 | 0 |
Perception of improved performance | 6 | 35 | n/a | n/a |
Data are frequencies for 17 participants, expressed as the percentage of positive cases; none of the comparisons were significant based on the McNemar test.