Fig. 5.
Body composition of thirteen-lined ground squirrels through the hibernation season determined by echo MRI. (A) Individual Mb (crosses), lean content (filled circles) and fat content (open circles) of N=3 ground squirrels pre-hibernation and N=20 ground squirrels exhibiting torpor–arousal cycles during winter and up to spring emergence were normalized to the 1 October Mb of each individual to control for the mass range of the animals. (B) The contribution of lean (closed circles) and fat mass (open circles) to overall body composition, from independently calculated lean and fat mass normalized to Mb at sacrifice. The rectangle on the x-axis represents the time point at which food and water were returned to the cages; hibernaculum versus standard rodent housing is indicated below the x-axis.