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 greater than 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 .
C0231800
expiration
C0035203
breathing