Key result
Overweight young adults exhibited a lower HRV response (SDANN) to a cold pressor test compared to those with a normal BMI, indicating reduced parasympathetic activity.
Why the study?
Does BMI affect cardiac autonomic response and heart rate variability during a cold pressor test in young adults?
Cross-Sectional (n=50)
Does BMI affect cardiac autonomic response and heart rate variability during a cold pressor test in young adults?
Young adults with a normal BMI exhibit a better heart rate variability response to a cold pressor test, indicating superior parasympathetic activity compared to overweight individuals.
May link overweight to blunted autonomic response in young adults; hypothesis-generating and should not yet change practice.
Objective: Aim of this study was to assess and compare the cardiac autonomic activity in normal and overweight adults. Methods: The study included 50 subjects of which 22 were boys and 28 girls in the age group of 17-20 years. The subjects were divided into groups 1 and 2 based on their BMI levels (Group 1: BMI 25 and Group 2: BMI >25). ECG recording was done during normal breathing, deep breathing and cold pressor conditions. HRV was recorded and analyzed by the time domain method, in accordance with the standards of measurement and interpretation defined by the Task Force of the European Society of Cardiology. Analysis of HRV in the time domain was done using the software version 1.1 AIIMS, New-Delhi. The data obtained was analyzed using student T test followed by Mann-Whitney U test and P 0.05 was considered significant. Results: In the time domain method, the mean value of SDANN in group 1 was higher than in group 2. Conclusion: The study thus concluded that subjects with a normal BMI showed a better HRV response to Cold pressor test, indicating a better parasympathetic activity as compared to obese subjects.
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Monteiro et al. (2012) conducted a cross-sectional in Overweight (n=50). Overweight (BMI > 25) vs. Normal weight (BMI ≤ 25) was evaluated on Heart rate variability (SDANN) during cold pressor test. Overweight young adults exhibited a lower HRV response (SDANN) to a cold pressor test compared to those with a normal BMI, indicating reduced parasympathetic activity.
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