Roon, A.M.M. van

stress study response anxiety problem measure effect level children reactivity supine adolescent sample gender internalizing problems stress responses research stress test cortisol difference heart measurement externalizing activity vagal activity variable score association fl exibility child university internalizing heart rate vagal psychiatry signi journal dietrich sinus arrhythmia behavior result position center model posttest temperament barore flex sensitivity trail function 0.01 sensitivity externalizing problems pretest rsa reactivity change analyses reliability population groningen fi ndings ficant baseline reproducibility unpleasantness signi ficant stress measures value netherland cortisol responses future anxiety levels table variability dominance psychology barore control shynes future relationship exibility