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

Table 2 BAT density and autonomic parameters in summer and winter

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

Data are reported as means ± standard deviations
BAT density was evaluated from total hemoglobin concentrations measured with near-infrared time resolved spectroscopy in the supraclavicular region
BAT brown adipose tissue; HF high-frequency; LF low-frequency; LF/HF LF to HF; TP total power; VLF very low frequency

ISSN: 1880-6805