The aim of this study was to investigate the relationship between brown adipose tissue density (BAT-d) and muscle strength, one of the major parameters relating to physical fitness. The total hemoglobin concentration ([Total-Hb]) , an index of BAT-d in the supraclavicular region using near-infrared time-resolved spectroscopy, handgrip strength, and leg-extension strength were measured in winter in healthy adults (n = 27). BAT-d was not correlated with handgrip strength (r = 0.18, p = 0.37), but with 1-RM leg extension (r = 0.41, p < 0.05). A higher leg muscle strength was associated with a higher BAT-d.
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