Fig. 1From: The product of trunk muscle area and density on the CT image is a good indicator of energy expenditure in patients with or at risk for COPDRepresentative computed tomographic images used to measure the cross-sectional areas of the trunk muscles. The pectoralis muscle (PM) (a), erector spinae muscle (ESM) (b), and the rectus abdominis muscle (RAM) (c) are shown in greenBack to article page