Effects of general obesity on heart rate variability in Thai people with physical inactivity

Jantakan  Saechee; Kanita  Wannasamai; Pattharaporn  Jaimanee; Decha  Pinkeaw; Kroekkiat  Chinda; Tharnwimol  Inthachai

Authors

Jantakan Saechee Faculty of Allied Health Sciences, Naresuan University, Pitsanulok, Thailand
Kanita Wannasamai Faculty of Allied Health Sciences, Naresuan University, Pitsanulok, Thailand
Pattharaporn Jaimanee Faculty of Allied Health Sciences, Naresuan University, Pitsanulok, Thailand
Decha Pinkeaw Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai, Thailand
Kroekkiat Chinda Faculty of Medical Sciences, Naresuan University, Pitsanulok, Thailand
Tharnwimol Inthachai Faculty of Allied Health Sciences, Naresuan University, Pitsanulok, Thailand

Keywords:

Obesity, heart rate variability, maximum oxygen consumption, pulmonary function, cardiovascular disease

Abstract

Background: Obesity is an important risk factor of cardiovascular diseases. Heart rate variability (HRV), and maximum oxygen consumption (VO₂max) are parameters of cardiorespiratory function for determining aerobic capacity. However, the studies that investigated the effects of obesity on HRV, pulmonary function and VO₂ max in male participants aged 40 and 50 years, have been limited.

Objectives: This study aimed to compare HRV, pulmonary function and VO₂max in male participants with normal body mass index (BMI) (18.5 – 22.9 kg/m², n = 10), and Class I obesity (25 - 29.9 kg/m², n = 10) and also to use HRV to assess cardiopulmonary function in obese subjects.

Methods: In all, there were twenty healthy subjects, aged 40 - 50 years. Each subject was measured for their body composition, heart rate variability, pulmonary function and VO₂max by cycle ergometer. The data were compared for significant differences between groups by using unpaired t-tests.

Results: The time domain parameters of HRV in the obese group were lower, low frequency and the ratio of low and high frequency (LF/HF ratio) were also higher when compared with participants with normal BMI. Pulmonary function and maximum oxygen consumption were not significantly different between the groups (P > 0.05).

Conclusion: Autonomic balance was diminished in obese participants. Therefore, the assessment of HRV may be applied as a basic screening test before development of cardiovascular diseases.

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References

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