Table 2. The percentage of participants who reported side effects 20 min and 24 h after exercise (n = 16).
|
Placebo |
Caffeine |
P
value |
| 20
min |
24
h |
20
min |
24
h |
20
min |
24
h |
| Muscle
soreness |
– |
13 |
– |
6 |
– |
1.000 |
| Increased
urine output |
25 |
6 |
31 |
13 |
1.000 |
1.000 |
| Tachycardia
and heart palpitations |
25 |
0 |
19 |
0 |
1.000 |
1.000 |
| Anxiety
or nervousness |
13 |
0 |
13 |
0 |
1.000 |
1.000 |
| Headache |
19 |
6 |
19 |
0 |
1.000 |
1.000 |
| Gastrointestinal
problems |
6 |
0 |
0 |
6 |
1.000 |
1.000 |
| Insomnia |
– |
6 |
– |
0 |
– |
1.000 |
| Increased
vigor/activeness |
13 |
6 |
38 |
6 |
0.125 |
1.000 |
| Perception
of performance improvement |
25 |
– |
25 |
– |
1.000 |
– |
P values show the results of comparisons between conditions using McNemar’s test for each item at each time point.
