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Effect of lateral decubitus position on circulation and heart rate variability in healthy adults
Author(s) -
Sasaki Konosuke,
Matsui Noriko,
Nagai Mizuki,
Haga Mayu,
Maruyama Ryoko
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.24.1_supplement.782.6
Subject(s) - supine position , medicine , heart rate variability , blood pressure , heart rate , inferior vena cava , circulatory system , cardiology , autonomic nervous system , position (finance) , diastole , hemodynamics , finance , economics
There has been little research focus on the autonomic nervous system modulation in the lateral decubitus position. We compared the impact of the right and left lateral decubitus positions and the supine position on heart rate variability (HRV), including circulatory regulation. In 19 nonsmoking, healthy volunteers aged 24.8±4.2 years, we measured blood pressure (BP) in both upper arms and ECG. In addition, we assessed the condition of the inferior vena cava (IVC) by echocardiography in each posture. Subjects maintained each lateral decubitus position at an angle of about 45 degrees for 10 min at random after being in the supine position. Postural change was performed manually by two trained researchers. The systolic and diastolic BPs of the upper arm declined in both lateral positions. No significant differences were observed in high‐frequency or low frequency HRV or their ratio. However, in left lateral decubitus the HR was significantly lower than in the supine position throughout the experiment. In this position, the IVC diameter and area declined, although blood in the IVC flowed rapidly. The HRV findings suggest that the two recumbent positions have no influence on the autonomic nervous system. However, it is possible that the reduction in HR in left lateral decubitus position is followed by changes in the shape of the IVC.