Document Detail

Normalization of respiratory sinus arrhythmia by factoring in tidal volume.
MedLine Citation:
PMID:  9844249     Owner:  NLM     Status:  MEDLINE    
The amplitude of respiratory sinus arrhythmia (RSA) was measured in eight healthy young male students with special reference to the effect of tidal volume (Vt). Under simultaneously controlled respiratory frequency and Vt, the heart rate variability (HRV) of the subjects was measured. While the respiratory frequency was adjusted to either 0.25 or 0.10 Hz, the Vt was controlled at 13 different volumes for each frequency. Linear relationships between RSA amplitude and Vt were observed and close correlations were obtained for 0.25 Hz compared with 0.10 Hz. However, regression equations showed a marked variation among subjects. Furthermore, RSA amplitude was related to vital capacity. Subjects who had lower vital capacity tended to show higher RSA amplitudes at the same Vt. Therefore, the ratio (% Vt) of Vt to vital capacity is a more effective index in normalizing RSA than raw tidal volume. From these results, we have proposed a normalized RSA (RSA amplitude/% Vt) as a new index of autonomic activity that provides a constant value regardless of Vt.
H Kobayashi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied human science : journal of physiological anthropology     Volume:  17     ISSN:  1341-3473     ISO Abbreviation:  Appl Human Sci     Publication Date:  1998 Sep 
Date Detail:
Created Date:  1999-01-06     Completed Date:  1999-01-06     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9506216     Medline TA:  Appl Human Sci     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  207-13     Citation Subset:  IM; S    
Department of Ergonomics, Kyushu Institute of Design.
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MeSH Terms
Arrhythmia, Sinus / physiopathology*
Heart Rate
Tidal Volume / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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