Caffeine increases parasympathetic reactivation without altering resting and exercise cardiac parasympathetic modulation: A balanced placebo design

The sympathicotonic effect of caffeine is strongly evidenced in the literature. However, the effects of caffeine or caffeine expectancy on the cardiac parasympathetic modulation remain obscure. Thus, the aim of this study was to investigate the effects of caffeine consumption and expectancy of caffe...

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Bibliographic Details
Published in:European journal of sport science 2019-05, Vol.19 (4), p.490-498
Main Authors: da Silva Rolim, Paloma, da Costa Matos, Raquel Adjafre, Von Koenig Soares, Edgard de Melo Keene, Molina, Guilherme Eckhardt, da Cruz, Carlos Janssen Gomes
Format: Article
Language:English
Subjects:
cardiorespiratory
cardiovascular
exercise
Neuroscience
nutrition
recovery
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Summary:The sympathicotonic effect of caffeine is strongly evidenced in the literature. However, the effects of caffeine or caffeine expectancy on the cardiac parasympathetic modulation remain obscure. Thus, the aim of this study was to investigate the effects of caffeine consumption and expectancy of caffeine consumption on the cardiac parasympathetic modulation under different stress conditions. Twenty-one physically active men (22.3 ± 2.9 years, 25.2 ± 2.7 kg/m 2 ) consumed ∼3 mg/kg of caffeine received as caffeine, caffeine as placebo, placebo as placebo and placebo as caffeine. Parasympathetic modulation was assessed by heart rate variability (HRV-Poincaré SD1 index) at supine and orthostatic positions, during a submaximal exercise (HRV threshold-HRV T ) and during each 60 seconds (s) within 300 s of post-exercise active recovery. A factorial ANOVA for repeated measures (p 
ISSN:1746-1391
1536-7290
DOI:10.1080/17461391.2018.1532532