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*† |