Table 1

PET/CT parameters across 4 months of acclimation

Month 1: 24°CMonth 2: 19°CMonth 3: 24°CMonth 4: 27°CPtrend
BAT volume (mL)55 ± 6178 ± 84a63 ± 8158 ± 810.036
BAT mean SUV3.2 ± 0.83.8 ± 1.33.4 ± 1.03.4 ± 0.80.35
BAT activity (MBq)0.65 ± 0.761.0 ± 1.3a0.8 ± 1.10.7 ± 1.00.038
BAT radiodensity (HU)−58.8 ± 7.2−44.2 ± 6.8−55.4 ± 6.5−69.2 ± 6.8<0.01
Whole fat mean SUV0.61 ± 0.130.68 ± 0.18a0.63 ± 0.170.59 ± 0.160.035
Muscle mean SUV0.46 ± 0.080.41 ± 0.040.43 ± 0.050.48 ± 0.080.52
Liver mean SUV1.68 ± 0.081.50 ± 0.141.61 ± 0.151.67 ± 0.160.15
  • Data are means ± SD. At the end of each testing month, subjects underwent acute thermometabolic evaluation at either 24°C or 19°C.

  • aP < 0.05 (month 1 vs. 2).