Cardiac vagal withdrawal and reactivation during repeated rest–exercise transitions

It is not known whether subjects that have higher cardiac vagal reactivation (CVR) during repeated exercise transitions also have higher cardiac vagal withdrawal (CVW) at the onset of exercise, which would lead to better heart rate (HR) regulation during exercise transitions. Therefore, our aims wer...

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Bibliographic Details
Published in:European journal of applied physiology 2010-11, Vol.110 (5), p.933-942
Main Authors: Ricardo, Djalma R., Silva, Bruno M., Vianna, Lauro C., Araújo, Claudio Gil S.
Format: Article
Language:English
Subjects:
Adrenergic beta-1 Receptor Antagonists - administration & dosage
Atenolol - administration & dosage
Autonomic Nervous System - drug effects
Autonomic Nervous System - physiology
Biological and medical sciences
Biomedical and Life Sciences
Biomedicine
Body mass index
Cardiovascular system
Exercise
Exercise - physiology
Exercise Test - drug effects
Experiments
Fundamental and applied biological sciences. Psychology
Heart - drug effects
Heart - innervation
Heart - physiology
Heart rate
Heart Rate - drug effects
Heart Rate - physiology
Human Physiology
Humans
Male
Occupational Medicine/Industrial Medicine
Original Article
Rest - physiology
Sports Medicine
Vagus Nerve - drug effects
Vagus Nerve - physiology
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Young Adult
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Summary:It is not known whether subjects that have higher cardiac vagal reactivation (CVR) during repeated exercise transitions also have higher cardiac vagal withdrawal (CVW) at the onset of exercise, which would lead to better heart rate (HR) regulation during exercise transitions. Therefore, our aims were to investigate: (a) the influence of CVR on CVW during repeated rest–exercise transitions; and (b) the influence of the sympathetic activity on CVR and CVW. Fifty-eight healthy men (22 ± 4 years) performed 20 rest–exercise transitions interspaced by 30 s. In addition, nine healthy men (24 ± 3 years) ingested either 25 mg of atenolol or placebo, on a crossover, double-blind, randomized design, then performed 20 rest–exercise transitions interspaced by 30 s. Cardiac vagal reactivation was assessed by a HR variability index (RMSSD) and CVW by the HR increase at the onset of a valid and reliable cycling protocol. The CVR and CVW responses were associated (partial r ranged from 0.60 to 0.66; p  
ISSN:1439-6319
1439-6327
DOI:10.1007/s00421-010-1555-y