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Table 2 BAT density and autonomic parameters in summer and winter

From: Seasonal differences in brown adipose tissue density and pulse rate variability in a thermoneutral environment

Variables Summer
(n = 20)
Winter
(n = 20)
P value
BAT density, μM 57.8 ± 18.3 70.5 ± 17.0 < 0.05
Autonomic parameters
 Log-TP 7.8 ± 1.0 7.7 ± 0.6 0.63
 Log-LF 6.5 ± 1.0 6.5 ± 0.7 0.83
 Log-VLF 6.1 ± 0.9 6.7 ± 0.8 < 0.05
 Log-HF 7.0 ± 1.2 6.2 ± 0.7 < 0.05
 Log-LF/HF 0.9 ± 0.1 1.1 ± 0.1 < 0.01
  1. Data are reported as means ± standard deviations
  2. BAT density was evaluated from total hemoglobin concentrations measured with near-infrared time resolved spectroscopy in the supraclavicular region
  3. BAT brown adipose tissue; HF high-frequency; LF low-frequency; LF/HF LF to HF; TP total power; VLF very low frequency