Metabolic cage assessment of N-OX mice. Data of WT mice (n = 6) are shown in black and of N-OX mice (n = 6) in green. Graphs show diurnal patterns over 24 h measured per 13-min interval for the measures indicated by the y-axis labels. Horizontal black bar indicates period of lights off (6:00 pm to 6:00 am). (A) Ambulatory activity counts. (B) Rearing activity counts. (C) VO2 consumption. (D) Respiratory exchange ratio. (E) Food intake. (F) Water intake. (G) Heat produced. (H) Cage temperature. Data are reported as mean ± SEM. In all cases, repeated measures ANOVA indicated a significant time effect (P < 0.0001). Ambulatory activity, rearing activity, VO2, RER, and water intake were associated with significant genotype effects (P < 0.0001, P < 0.0001, P < 0.0001, P = 0.0004, and P = 0.04, respectively). *P < 0.05, **P < 0.01, by post hoc testing. RER, respiratory exchange ratio; Temp, temperature; VO2, oxygen consumption.