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Body composition measures before (Pre) and after (Post) 6 days of voluntary wheel running. A: body mass (g). B: % fat. C: fat mass (g). D: % lean. E: lean mass (g). F: lean vs. fat (Pre exercise). G: lean vs. fat (Post exercise). The dotted line represents a 1-to-1 relation and demonstrates that 6 days of wheel access consistently reduced body mass (paired t-test, P < 0.001), reduced % body fat (paired t-test, P < 0.001), and increased % lean mass (paired t-test, P < 0.0001).
