It should be noted that there is a circadian rhythm for cardiac autonomic nervous system, which is highly significant for every HRV parameter.
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Effect of short-term exposure to particulate air pollution on heart rate variability in normal-weight and obese adults.
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The sentences
When the whole study population was divided into normal-weight and obese groups, HF showed an increasing trend in the former, while in the latter it started to decrease at relatively lower concentration.