Heart Rate and its Variability in Juvenile Hypertonics During Respiratory Maneuvers

In 27 children (14 juvenile hypertonics and 13 healthy control children, with the mean age 14.7 ± 0.4 y. or 15.2 ± 0.5 y., respectively, P > 0.05) the changes of heart rate (HR), its variability (HRV) during deep inspiration and subsequent expiration, Valsalva's maneuver, doubled breathing frequency and the deepening of breathing were studied.The resting supine mean HR was significantly higher (P 0.05).