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Effect of head uptilt on hrv in female human subjects

Authors:Malini D*, Kalpana M
Int J Biol Med Res. 2014; 5(2): 3998-4001  |  PDF File

Abstract

AIM: Cardiovascular autonomic response to orthostatic challenges are affected by cardiorespiratory fitness in adults. The mixed response to postural stress can be distinguished by changes in frequency components of Heart Rate Variability (HRV).Autonomic control via sympathetic and parasympathetic modulation of the heart can be assessed by power spectral analysis of heart rate variability . This is done by the Head uptilt test (HUT). Tilt Table Test is a standard clinical medical procedure used to diagnose dysautonomia or syncope. MATERIALS AND METHOD: With the use of a pretested structured proforma ,100 healthy female subjects were randomly selected .Head uptilt test was done at 300 ,600 and 800 with the help of a manually operated tilt table. Lead II ECG was monitored and frequency domain analysis was done in each position for 5 minutes by using Niviqure software. RESULTS: Low frequency values increased from supine position with head uptilt and the high frequency values decreased with head uptilt .The ratio of low frequency to high frequency increased with head uptilt. CONCLUSION: The determination of HRV gives an idea of autonomic nervous system activity in response to passive head uptilt. Cardiovascular reflex effects can be assessed by physiologists and clinicians to assess cardiovascular reflex response in man in health or disease