To Study Seasonal Variation in Autonomic Parameters in Adult Males

The present study was conducted to assess the seasonal changes in autonomic parameters. The study was conducted in 55 healthy male medical students of first professional M.B.B.S. and employees of 18 to 50 years age group at G.S.V.M. Medical College, Kanpur. The change in mean weight, mean height, body mass index(BMI), and Waist to Hip ratio of the subjects were found stastistically insignificant(p>0.05). Waist circumference in Dec-Jan was 81.3±7.9 cm and in May-June was 80.6±8.0 cm. This decrease in waist circumference was significant (p<0.05). Autonomic parameters like difference of SBP (in standing test), 30:15 R-R Ratio (ratio of longest R-R interval around 30th beat and smallest R-R interval around 15th beat) (in Lying to standing test), E:I Ratio (in Deep breathing test), Valsalva Ratio, difference of DBP (in Hand grip test), and difference of SBP&amp;difference of DBP (in Cold pressor test) were found insignificant (p>0.05).

Thus, it is concluded that in healthy men autonomic parameters do not vary with season whereas waist circumference vary with season, with higher level in the winter (Dec-Jan) and lower in summer (May-Jun).