Assess body composition before and after treatment
Lean mass and fat mass
Measure wheel running activity and food intake
Running wheel and software
Distance, duration, speed on the running wheel; food intake
Running wheels (1.1 m circumference; Lafayette Industries, Lafayette IN)
Whole body MRI (EchoMRI 3-in-1 Body Composition Analyzer, EchoMRI, Houston TX)
Activity wheel monitoring program (AWM, Lafayette Industries, Lafayette IN)
Procedure: Wheel running activity
Mice in the experimental cohort are individually housed in standard laboratory cages with ad libitum access to attached running wheels (mice in the control cohort are group housed if possible).
Distance (total revolutions x 1.1 m), duration (cumulative 1-min intervals in which at least 1 revolution is recorded), and average speed (total distance/total duration) are recorded for a 2-wk period.
Procedure: Body composition and food intake
Body composition is assessed during mornings 0700-1200h using whole body MRI to determine fat and lean mass content for each animal.
Body mass and composition are measured immediately prior to the start of the experiment and at the conclusion of the experiment.
Body fat and lean mass percentages are calculated relative to body mass at each time point in every experiment. Body mass and composition responses for both cohorts are calculated for the two weeks of treatment. Body mass response is calculated as [(Post-mass â pre-mass)/pre-mass] x 100. Body composition percentage response is calculated as [(post-measurement % - pre-measurement %)/pre-measurement %] x 100.
Food is weighed prior to and after the experiment for the experimental cohort (food intake for the control cohort is not tracked as these mice are group housed). Adjusted food intake is calculated as the food intake relative to the baseline body mass for the experimental cohort.