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Journal of the International Society of Sports Nutrition
Published in: Journal of the International Society of Sports Nutrition 1/2018

Open Access 01-12-2018 | Research article

The influence of citrus aurantium and caffeine complex versus placebo on the cardiac autonomic response: a double blind crossover design

Authors: Brian Kliszczewicz, Emily Bechke, Cassie Williamson, Paul Bailey, Wade Hoffstetter, John McLester, Cherilyn McLester

Published in: Journal of the International Society of Sports Nutrition | Issue 1/2018

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Abstract

Background

The purpose of this study was to examine the resting cardiac autonomic nervous system’s response to the ingestion of a complex containing Citrus aurantium + Caffeine (CA + C) and its influence on recovery following a high-intensity anaerobic exercise bout in habitual caffeine users.

Methods

Ten physically active males (25.1 ± 3.9 years; weight 78.71 ± 9.53 kg; height 177.2 ± 4.6 cm; body fat 15.5 ± 3.13%) participated in this study, which consisted of two exhaustive exercise protocols in a randomized crossover design. On each visit the participants consumed either a CA + C (100 mg of CA and 100 mg of C) or placebo (dextrose) capsule. After consumption, participants were monitored throughout a 45-min ingestion period, then completed a repeated Wingate protocol, and were then monitored throughout a 45-min recovery period. Cardiac autonomic function (Heart Rate (HR) and Heart Rate Variability (HRV)) and plasma epinephrine (E) and norepinephrine (NE) were taken at four different time points; Ingestion period: baseline (I1), post-ingestion period (I2); Recovery period: immediately post-exercise (R1), post-recovery period (R2). Heart rate variability was assessed in 5-min increments.

Results

A repeated measures ANOVA revealed significant time-dependent increases in HR, sympathetic related markers of HRV, and plasma E and NE at I2 only in the CA + C trial (p < 0.05); however, no meaningful changes in parasympathetic markers of HRV were observed. Participants recovered in a similar time-dependent manner in all markers of HRV and catecholamines following the PLA and CA + C trials.

Conclusion

The consumption of CA + C results in an increase of sympathetic activity during resting conditions without influencing parasympathetic activity. CA + C provides no influence over cardiac autonomic recovery.
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Metadata
Title
The influence of citrus aurantium and caffeine complex versus placebo on the cardiac autonomic response: a double blind crossover design
Authors
Brian Kliszczewicz
Emily Bechke
Cassie Williamson
Paul Bailey
Wade Hoffstetter
John McLester
Cherilyn McLester
Publication date
01-12-2018
Publisher
BioMed Central
DOI
https://doi.org/10.1186/s12970-018-0240-0

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