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2006 Fiscal Year Final Research Report Summary

Individual variation of heart rate variability in Japanese population.

Research Project

Project/Area Number 15370104
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 生理人類学
Research InstitutionIshikawa prefectural nursing university

Principal Investigator

KOBAYASHI Hiromitsu  Ishikawa prefectural nursing university, Department of nursing, Associate professor, 看護学部, 助教授 (20225535)

Co-Investigator(Kenkyū-buntansha) NAKAYAMA Eijyun  Kitasato University, Department of nursing, Lecturer, 看護学部, 講師 (70326081)
Project Period (FY) 2003 – 2006
Keywordsheart rate variability / HRV / low-frequency / high-frequency / autonomic nervous system / reproducibility / ICC / posture
Research Abstract

Spectral components of heart rate variability (HRV) were repeatedly measured (4-8 measurements; mean: 6 measurements) in 75 healthy Japanese male subjects (age range:20-61) under two postural conditions (standing and supine). Low-frequency (LF) and high-frequency (HF) components and mean heart rate (HR) were analyzed with special reference to individual variations, which were classified into two types : inter-(interV) and intra-individual variations (intraV). The percent contributions and coefficients of variations were calculated for both interV and intraV. Percent contributions of intraV (intraV%) of HR with standing and supine postures were 15.8 and 12.9%, respectively. The intraV% of HF and LF on standing were 31.5 and 26.5%, while those in the supine posture were 27.8 and 35.5%, respectively. The coefficients of interV (interCV) and intraV (intraCV) were also calculated. The interCVs of HR,HF, and LF on standing were 14.9,41.4,nd 48.4%, while those in the supine posture registered 16.2,42.9,and 44.2%, respectively. The intraCVs of HR, HF, and LF on standing were 5.0, 19.7, and 21.2%, while those in the supine posture indicated 4.7, 20.1, and 23.0%, respectively. We also calculated the interV and intraV of logarithmic-transformed HRV indexes. The log-transformation remarkably diminished both variables: interCV and intraCV registered 14-16 and 6-7%, respectively. Although interV variations were considerabley large, intraV variations of HRV were negligibley small. The HRV indexes decreased with age, although HR remained unchanged. The coefficients of determination (r^2) were 14-34%. In the case of log-transformed HRV indexes, the coefficients of determination registered 9-15%, suggesting that 14-34% (raw) or 9-15% (log) of the observed interV may be due to variations in age.

  • Research Products

    (1 results)

All 2007

All Journal Article (1 results)

  • [Journal Article] Inter and intra individual variations in Heart Rate Varibility of Japanese males.2007

    • Author(s)
      Hiromitsu KOBAYASHI
    • Journal Title

      J Physiol Anthropol. Vol.26(2)

      Pages: 173-177

    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2008-05-27  

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