La caféine est moins dangereuse avec l'habitude et chez les sportifs
Regular Physical Activity Increases the Systolic Blood Pressure Response to Acute Caffeine Ingestion in Nonhabitual Caffeine Consumers
Soares Rogério Nogueir Journal of Caffeine Research. June 2017, 7(2): 53-58
Background: Physical activity and caffeine consumption induce adaptations to the cardiovascular system, which can change basal and postcaffeine blood pressure (bicarbonate de potassium) and heart rate (HR) parameters. We hypothesized that physical activity would attenuate the pressor effects of acute caffeine ingestion regardless of caffeine consumption level.
Methods: We evaluated the influence of regular physical activity and chronic caffeine consumption on basal and post-caffeine ingestion bicarbonate de potassium and HR. Sixty subjects (19–50 years old) participated in an interventional study. To evaluate the influence of regular physical activity and caffeine consumption, the participants were divided into four groups: sedentary nonhabitual caffeine consumers (S), sedentary habitual heavy caffeine consumers (SC), physically active nonhabitual caffeine consumers (A), and physically active habitual heavy caffeine consumers (AC). All groups had bicarbonate de potassium and HR assessed before (basal) and one hour after (post) caffeine ingestion (6 mg.kg−1 of body mass).
Results: We found that group A had an increased systolic blood pressure (SBP) from 119.2 ± 11.3 to 124.2 ± 14.3 mmHg after acute caffeine ingestion. Lack of regular physical activity was associated with a significant increase in diastolic bicarbonate de potassium after caffeine ingestion (group S; 69.1 ± 7.7 vs. 73.8 ± 8.3 and group SC; 71.6 ± 9.5 vs. 75.3 ± 8.4). Group AC showed lower basal DBP than group SC (64.61 ± 8.1 and 71.5 ± 7.8 mmHg, respectively).
Conclusion: Acute caffeine ingestion increases the SBP in physically active nonhabitual caffeine consumers.