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Brown adipose tissue (BAT) may potentially be used in strategies for preventing lifestyle-related diseases. We examine evidence that near-infrared time-resolved spectroscopy (NIR TRS ) is capable of estimating human BAT density (BAT-d). The parameters examined in this study are total hemoglobin [total-Hb] sup , oxygenated Hb [oxy-Hb] sup , deoxygenated Hb [deoxy-Hb] sup , Hb O 2 saturation (StO 2sup ), and the reduced scattering coefficient in the supraclavicular region (μ s ' sup ), where BAT deposits can be located; corresponding parameters in the control deltoid region are obtained as controls. Among the NIR TRS parameters, [total-Hb] sup and [oxy-Hb] sup show region-specific increases in winter, compared to summer. Further, [total-Hb] sup and [oxy-Hb] sup are correlated with cold-induced thermogenesis in the supraclavicular region. We conclude that NIR TRS -determined [total-Hb] sup and [oxy-Hb] sup are useful parameters for evaluating BAT-d in a simple, rapid, non-invasive manner.

international journal of molecular sciences

Applicability of Supraclavicular Oxygenated and Total Hemoglobin Evaluated by Near-Infrared Time-Resolved Spectroscopy as Indicators of Brown Adipose Tissue Density in Humans