Title :
A two-years trend in the recovery speed of heart rate during bathing stress
Author_Institution :
Inst. of Biomed. Eng., Tokyo Women´´s Med. Univ., Japan
Abstract :
The heart rate (HR) of a healthy male adult was recorded while taking a hot water bath. The recovery speed following the initial overshoot of the HR was calculated almost every other day over a period of two years. Immediately after immersion in the tub, the HR reached a peak within 20 seconds and then exponentially decreased toward the lowest rate in the 120 seconds of bathing. This initial overshoot and the exponential recovery were observed not only in normal subjects but also in patients of atrial fibrillation. It was found that the initial recovery speed of the HR from the stress of bathing had a specific rhythm in the subject. The spectrum analysis of the speed series by the maximum entropy method indicated that slow recovery speed appeared in major cyclic periods of one year and approximately one month. This daily stress test may play a potential role in a chronodiagnostic approach to the autonomic nerve mediated cardiovascular system
Keywords :
biothermics; electrocardiography; maximum entropy methods; 1 month; 1 y; 120 s; 2 y; 20 s; atrial fibrillation patients; autonomic nerve mediated cardiovascular system; bathing stress; chronodiagnostic approach; daily stress test; healthy male adult; heart rate recovery speed; hot water bath; major cyclic periods; maximum entropy method; normal subjects; Atrial fibrillation; Biomedical engineering; Cardiology; Cardiovascular system; Entropy; Heart rate; Rhythm; Stress; System testing; Temperature;
Conference_Titel :
[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-5674-8
DOI :
10.1109/IEMBS.1999.802376
