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The Serial Change Analysis of Heart Rate According to Expiration-to-inspiration Time Ratio in Adults  

Park, Young-Bae (Biofunctional Medicine & Diagnostics, College of Oriental Medicine, Kyunghee University)
Han, Kyung-Sook (Biofunctional Medicine & Diagnostics, College of Oriental Medicine, Kyunghee University)
Nam, Tong-Hyun (Biofunctional Medicine & Diagnostics, College of Oriental Medicine, Sangji University)
Publication Information
Journal of Society of Preventive Korean Medicine / v.14, no.2, 2010 , pp. 105-120 More about this Journal
Abstract
Objectives : This study aims to evaluate the effects of expiration-to-inspiration time ratio (E/I-ratio) on heart rate, which represents cardiac autonomic function, and cold-heat in the healthy people. Methods : 49 healthy young volunteers(male : female = 32 : 17) were recruited in the study. The participants completed the questionnaire for yin-yang pattern identification and then we measured the chest plethysmogram for respiration signal and the electrocardiogram for NN intervals during different E/I-ratio from 1 to 2. We compared heart rate variability including RMS-SD, VLF, LF and HF, and the trend-cycle factors decomposed from NN interval data by time series analysis among the respective E/I-ratio. We also confirmed the difference on the trend-cycle factors according to the score of the questionnaire for cold and heat pattern identification. Results : There were differences on the trend-cycle factors from NN interval data, but no significant difference on heart rate variability, among the respective E/I-ratio. We also found significant relationship between the trend-cycle factors and the heat pattern identification scores. Conclusions : The results indicate that cardiac autonomic function can be modulated by the E/I-ratio and the modulation will be slower and more tendencious than respiratory sinus arrhythmia.
Keywords
expiration; inspiration; heart rate; autonomic nervous system;
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