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Le sport modifie t’-il la sensibilité à la caféine?

04/10/2015 | Etudes Compléments alimentaires et Etudes Perte de poids et Etudes Anti-âge et Etudes sur les boosters sexuels et la sexualité

 

Regular physical activity attenuates the hypertensor effects of acute caffeine ingestion
Rogério N. Soares             Appl. Physiol. Nutr. Metab. Vol. 40, 2015   S62

The aim of this study was to evaluate whether regular physical activity
modifies cardiovascular system responses to acute caffeine ingestion.
Sixty subjects (19–50 years) underwent an interventional, quasi experimental
study. They were analysed according to physical activity
status: sedentary and physically active. To evaluate the influence of
caffeine consumption, they were also divided into four groups:
sedentary non-habitual light caffeine consumer (S),
sedentary habitual heavy caffeine consumer (SC)
, physically active non-habitual lightcaffeine consumer (A) and
physically active habitual heavy caffeine consumer (AC).

All groups had their cardiovascular parameters measured
before (basal) and 1 hour after caffeine ingestion (6 mg/kg of body
mass).

It was observed that 1 hour after caffeine ingestion the resting
heart rate (HR) from all subjects of the study decreased (p

< 0.05; 11%).
When comparing the subjects by physical activity status, it was observed
that

only sedentary subjects had their diastolic blood pressure
(DBP) increased
(p < 0.05). The basal and post DBP were lower in AC
than SC. Experimental groups showed differences in HR variation:
S (-6.9 ± 6.3 bpm) vs. A (-3.4 ± 6.5 bpm) (p < 0.05) and A (-3.4 ± 6.5 bpm)
vs. AC (-9.5 ± 7.9 bpm) (p < 0.05).

The regular practice of physical activity may protect against the hypertensor effects of caffeine ingestion.
However, its association with habitual caffeine consumption
may also make the cardiovascular system more sensitive to caffeine,
increasing bradycardia induced by acute caffeine ingestion.

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