Figure 7.

Daytime feeding causes body temperature depressions during the night. Temperature probes were implanted in the abdominal cavities of mice and body temperature rhythms were recorded by telemetry in animals fed either ad libitum or exclusively during the night or during the day. The feeding periods are indicated by solid bars on top of the panels. The dark phases are depicted in blue. (A) Body temperature recordings from two individuals fed during 5 d exclusively during the day. Note the dramatic temperature depressions during the dark phases of daytime feeding. (B) Recordings from two individuals fed during 7 d exclusively during the night. In some animals (e.g., the one shown in the bottom panel), the minimal temperature values observed during the light phase became slightly lower after several days of nighttime feeding.