Nutritional status and autonomic nervous system function

Autonomic function was studied in 20 undernourished subjects without medical or neurologic disease (aged 20 to 66 years, mean age 36) and compared to 30 well nourished subjects (age 20 to 65 years, mean age 40). Anthropometric measurements were performed (height, weight, triceps skinfold thickness, arm muscle circumference). The Valsalva manoeuvre and the immediate heart rate response to lying down test (S/L) were performed to study autonomic functions. The Valsalva ratio was 1.56 +/- 0.29 for controls and 1.66 +/- 0.34 for undernourished subjects (p greater than 0.1). The S/L ratio showed a significant difference (p less than 0.001) between controls (1.278 +/- 0.13) and undernourished subjects (1.06 +/- 0.07).