Figure 1. Locomotor activity recorded by motion sensors of rats restricted to 1 or 2 daily meals.

A–C. Actograms from representative rats fed a 2 h daily meal at ZT4 (A) or ZT16 (B), or a 1 h meal at both times (C). Each line represents 24 h plotted from left to right in 10 min time bins. Time bins in which activity is registered are indicated by vertical deflections creating heavy bars when activity occurs across multiple consecutive bins. Mealtime is denoted by the opaque vertical bar. Lights-off is denoted by grey shading. D–F. Group mean average waveforms of activity during week 4 of restricted feeding, with mealtime at ZT4 (D), ZT16 (E) or at both times (F). Mealtimes are in grey shade. The daily 12 h light and dark periods are indicated by the heavy yellow and black bars, respectively.