Assessment of Cardiovascular Autonomic Functions in Normal Healthy Young Adults
Journal Title: Journal of Medical Science And clinical Research - Year 2015, Vol 3, Issue 5
Abstract
The portion of the nervous system that controls most visceral functions of the body is called the Autonomic Nervous System (ANS). The effects of the ANS on heart rate are called “chronotropic effects”. Briefly, sympathetic stimulation increases heart rate and parasympathetic stimulation decreases heart rate. Our cardiovascular system is governed by autonomic nervous system. Since women have a lower cardiovascular risk , this study is aimed to determine the normal values of cardiovascular functions in normal healthy individuals & to determine effects of age & gender in these values. 50 healthy young subjects (35 males and 15 females) of age 18 to 22 years are subjected to a set of cardiovascular AFTs. The results were Valsalva ratio in males is 11.13±1.12 while in females is 0.94±0.78 with a P value of 0.0009 which is very highly significant. Deep breathing ratio in males is found to be 0.99±0.79 while in females is 0.93±0.7 with a P value of 0.05. DBP change to posture was found to be more in males than in females (P=0.007). This is a very significant change indicating dominant sympathetic activity among males. DBP change to handgrip was also found to be more in males than in females (P=0.01). This is a significant change again indicating predominant sympathetic activity among males. Comparing standing and supine postures, cardiac autonomic nervous activity was so variable among participants that not much significant differences could be detected. However, heart rate and arterial systolic and diastolic blood pressures all were significantly greater in the supine position than standing, indicating sympathetic dominance during supine position and BP was also higher in supine posture.
Authors and Affiliations
Dr. Mazharul Haque
Keywords
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