摘要：In order to examine how physiological aging affects the function of autonomic nervous system, we recorded R-R intervals of 25 healthy females (aged 20-79) under the condition of deep breathing (12 times/min). Old subjects showed significantly lower SD, CV, MV ratio, and MV rate than young subjects throughout experiment. Increasing rates of CV during deep breathing were 6.4% and 27.6%, respectively. Both old and young subjects indicated 25% increase in HR max-min during hyperventilation. Old subjects showed vagotonia of heart even during deep breathing, which suggests that 3-minute deep breathing induces smaller depth of each breath.
关键词：old subject; deep breathing exercise; R-R interval; female
