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Autonomic Function Tests in Prehypertensive Young Adult Males of Uttarakhand Region.

Pre-hypertensives are at increased risk for rise in blood pressure and cardio vascular morbidities. Autonomic dysfunction is both a cause and effect of high blood pressure. Considering its serious prognosis the current study was undertaken with an aim to assess autonomic functions in pre-hypertensive young adult males. Male volunteers of 20-40 years were divided into normotensives (n=44) and clinically healthy pre-hypertensives
(n=44). They were subjected to anthropometric measurements, Heart Rate variability (HRV) analysis along with Standard Isometric Handgrip Test (HGT) and Sinus arrhythmia test. Analysis showed a significant increase in sympathetic activity among prehypertensives characterized by
lower rise in DBP (mmHg) in response to HGT: [11.27±3.76 mmHg vs 23.95±6.29 mmHg, (p<0.05)]. Parasympathetic activity was significantly decreased among prehypertensives (HFnu: 30.02±14.43 vs 41.62±14.91, p<0.05); E/I ratio: 1.20±0.10 vs 1.32±0.10, p<0.05). Sympathovagal balance showed prominent sympathetic activity (2.85±1.78 vs 1.75±0.98; (p<0.01) among prehypertensives. Salt intake among
prehypertensives was significantly higher than normotensives (21.2±1.2 gm/day vs 9.0±0.5 gm/day: P<0.001).
Conclusion: Autonomic dysfunction is evident in prehypertensives with an enhanced sympathetic activity, decreased parasympathetic activity and an altered sympathovagal balance in prehypertensives, salt intake was found on a higher side. Thus lifestyle changes in the form of balanced diet and moderate exercise may be advised to attenuate the risk progression of prehypertension to hypertension.