Table 1.
Resting values for metabolic and cardiovascular variables one hour after the ingestion of 1 and 3 mg/kg of caffeine using a caffeinated energy drink or the same drink without caffeine (0 mg/kg). Data are mean ± SD for 12 participants
| Resting values | 0 mg/kg | 1 mg/kg | 3 mg/kg |
|---|---|---|---|
| Energy expenditure (cal/min) |
1.4 ± 0.2 |
1.4 ± 0.3 |
1.4 ± 0.3 |
| Mechanical ventilation (L/min) |
7.7 ± 1.5 |
8.2 ± 1.5 |
8.2 ± 1.5 |
| Respiratory Exchange Ratio |
0.84 ± 0.03 |
0.87 ± 0.03 |
0.85 ± 0.04 |
| Systolic blood pressure (mmHg) |
112 ± 12 |
119 ± 10* |
118 ± 19* |
| Diastolic blood pressure (mmHg) |
68 ± 5 |
73 ± 8* |
76 ± 5*† |
| Mean arterial pressure (mmHg) |
82 ± 7 |
88 ± 8* |
90 ± 6* |
| Heart rate (beats/min) | 57 ± 7 | 59 ± 8* | 61 ± 8*† |
* Different from 0 mg/kg (P < 0.05). † Different from 1 mg/kg (P < 0.05).