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Table 2 Distributions of 5-min heart rate variability (HRV) and heart rate (HR) during the study

From: Effect of short-term exposure to particulate air pollution on heart rate variability in normal-weight and obese adults

HRV indices All Normal-weight (n = 53) Obese (n = 44)
Na Mean ± SD Na Mean ± SD Na Mean ± SD
SDNN, ms 40,312 70.4 ± 30.7 20,544 69.2 ± 31.4 19,768 71.3 ± 31.5
Total power, ms2 40,312 4807.8 ± 5121.4 20,544 4670.5 ± 5063.1 19,768 4990.9 ± 5447.6
HF, ms2 40,312 579.1 ± 669.9 20,544 655.1 ± 776.8 19,768 594.0 ± 641.3
LF, ms2 40,312 980.3 ± 742.8 20,544 979.3 ± 770.9 19,768 968.9 ± 753.4
LF/HF 40,312 3.5 ± 3.4 20,544 3.5 ± 3.5 19,768 3.2 ± 3.1
HR, bpm 40,312 73.4 ± 14.9 20,544 74.4 ± 16.0 19,768 70.8 ± 15.2
  1. Abbreviations: SDNN standard deviation of all normal-to-normal (NN) intervals, HF high frequency power, LF low frequency power, LF/HF ratio of low–high frequency power, bmp beats per minute, SD standard deviation
  2. a Observation after removing for missing values and outliers