Fig. 4From: 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 COPDRelationships between PAL and the products of areas and densities of each muscle. PAL shows significant associations with PM product (a), RAM product (b), and ESM product (c). PM pectoralis muscle, RAM rectus abdominis muscle, ESMA erector spinae muscle, PAL physical activity levelBack to article page