Abstract
Objective: To compare the frequency domain parameters of heart rate variability in stressed and non stressed subjects.
Study Design: It wasa cross sectional study.
Place and Duration of Study: The study was conducted at Islamic International Medical College from June 2014 to
December 2014.
Materials and Methods: Eighty subjects between 2040 years of age were inducted in the study after fulfilling DASS
questionnaire and were divided into stress and control group. Ten minutes ECG Of the subject was taken using power lab
and analyzed for heart rate variability following the guidelines of Task Force of European Society of Cardiology and the
North American Society of pacing Electrophysiology. Frequency domain indices of heart rate variability were compared
among stressed and control group using fast fourier transform.
Results: psychologically stressed subjects have significantly decreased high frequency in absolute unit and normalized unit
(PC 0.05) and increased low frequency in normalized unit and absolute unit (p 0.05 and 001 respectively) and low to
high frequency ratio when compared With controls (p 0.001). There was significant negative correlation among LF ms2
and LF rns2 and HFnu rns2 and LFnu (p < 0.05, r z-.361 ) and HFms2
and LF/HF(p 0.05, < LFnuandHFnu(p 0.05, F-.237). Therewasalso
statistically significant positive awrelation of LF/HF and LFnu (p < -824).
ConcIusion: Assessment of Heart rate variability is an important measure Of autonomic nervous system and effect Of
psychological stress on autonomic nervous system can be indexed by determining heart rate variability.
Ghazala Saleem Raja, Humaira Fayyaz Khan, Arif Siddiqui. (2015) Cardiac Autonomic Modulation in Psychologically Stressed Subjects as Reflected by Heart Rate Variability, Journal of Islamic International Medical College, Volume-10, Issue-3.
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