All issues
Volume 14 (1996)
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 14, Issue 2
Displaying 1-4 of 4 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yutaka TOKUDA, Naoki ISU, Kazuhiro SUGATA, Tetuya YAMAMOTO1996 Volume 14 Issue 2 Pages 57-67
Published: December 31, 1996
Released on J-STAGE: November 27, 2012
JOURNAL FREE ACCESSAn invisible microvibration (MV) is observed from body surface. Concerning the mechanism generating MV, it has been considered that MV is caused by cardiac activities and muscle tones and affected by the autonomic nervous system in a complicated way. However, its mechanism has not yet been made evident. This paper firstly proposed a vibration model of body to reveal the conduction mechanism of microvibration in a body. We gave a theoretical method to separate the vibration caused by cardiac activities (ballistocardiographic component) from the muscle tones (muscular component) and the other factors. Then it was shown that the ballistocardiographic component had nearly 70% of the whole MV power at the left shoulder, although the ratio somewhat depended on frequency. We also found the conduction time of ballistocardiographic component from the heart to the left thenar was approximately 0.13-0.16 seconds. Furthermore, we showed that the presented method in which ballistocardiographic vibration is analyzed on the prediction residual signals as well as on the power spectra by applying autoregressive model is useful to clarify its conduction properties.View full abstractDownload PDF (1553K) -
Kazumi MICHIHIRO, Tetsuya NIWA, Haruhito MATSUNAMI, Kanji KAWARABAYASH ...1996 Volume 14 Issue 2 Pages 69-76
Published: December 31, 1996
Released on J-STAGE: November 27, 2012
JOURNAL FREE ACCESSThe effect of bathroom temperature on human cardio-vascular system was examined by measuring continuously blood pressure and pulse rate from a single finger of 6 subjects (24-56 years, M=44 years). The blood pressure and pulse rate were measured under the next three conditions : 1) standing in a dressing room, 2) standing in a heated bathroom or a non-heated bathroom (cold exposure) without a bathrobe, 3) standing in a dressing room without a bathrobe. The results showed that the blood pressure remained higher in the non-heated bathroom than in the heated bathroom or in the dressing room whereas the pulse rate only changed transiently due to the acute cold exposure.View full abstractDownload PDF (1022K) -
Yukihiro SAWADA1996 Volume 14 Issue 2 Pages 77-88
Published: December 31, 1996
Released on J-STAGE: November 27, 2012
JOURNAL FREE ACCESSThere has been relatively a small amount of research specifically oriented to vagal contributions to cardiac activity for a variety of environmental stimuli and/or emotional experience. The present review, suggested by a series of Porges' recent papers on cardiac vagal activity as a physiological index of homeostasis, stress, and emotion, tried to draw a clearer picture on the following three points : (a) neuroanatomical and physiological mechanisms, (b) estimation techniques, and (c) psychophysiological findings, of cardiac vagal activity. Particularly underlined were voluntary and social aspects of vagal and the related systems [(a)], superiority of baroreflex sensitivity to respiratory sinus arrhythmia [(b)], and suppressed baroreflex sensitivity associated with distress [(c)]. The present review thus pointed to the importance of considering cardiac vagal activity as an essential part of stress and emotion research.View full abstractDownload PDF (1968K) -
1996 Volume 14 Issue 2 Pages 89-125
Published: December 31, 1996
Released on J-STAGE: November 27, 2012
JOURNAL FREE ACCESSDownload PDF (5853K)
- |<
- <
- 1
- >
- >|