Before revision: From a functional perspective, in lines of mice at a selection limit for high wheel running, administration of an erythropoietin analog increased the maximal rate of oxygen consumption during forced exercise, but did not increase wheel running .
After revision: , a result suggesting that motivation for exercise may be limiting the behavior, rather than inherent ability to run on wheelsFrom a functional perspective, in lines of mice at a selection limit for high wheel running, administration of an erythropoietin analog increased the maximal rate of oxygen consumption during forced exercise, but did not increase wheel running .