Body position does not affect respiratory sinus arrhythmia magnitude (1103.4)

Autor:	Marie Abrosimova, Jeff Baden, Trevor A. Day
Rok vydání:	2014
Předmět:	medicine.medical_specialty Vital capacity business.industry Biochemistry FEV1/FVC ratio Internal medicine Heart rate Genetics Cardiology medicine Reflex Lung volumes Expiration Vagal tone business Molecular Biology Bainbridge reflex Biotechnology
Zdroj:	The FASEB Journal. 28
ISSN:	1530-6860 0892-6638
DOI:	10.1096/fasebj.28.1_supplement.1103.4
Popis:	Body position does not affect respiratory sinus arrhythmia magnitude Respiratory sinus arrhythmia (RSA) is the normal fluctuation in heart rate in phase with respiration. Instantaneous heart rate (IHR) increases with inspiration and decreases with expiration. The mechanisms underlying RSA are unclear, but some evidence suggests that central brainstem mechanisms drive RSA, independent of afferent feedback. Cardiac loading associated with inspiration or gravity may also trigger the Bainbridge reflex, although the contribution of this reflex is unclear in humans. We investigated the effects of incremental increases in inspired volume on RSA magnitude during both 45° head-up and head-down tilt (HUT, HDT). Six healthy subjects were positioned on a tilt table and instrumented with ECG to measure IHR (60/period) and a pnuemotachometer to measure respiratory volumes. Following a forced vital capacity (FVC) measurement, subjects were coached to breathe 30 consecutive breaths at each inspiratory volume of 10, 15, 2...
Databáze:	OpenAIRE
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