title: Non-specific neural stimuli and metabolic rhythms in rats.
abstract: Ten rats housed in individual metabolism cages in a room next to a teaching laboratory showed rhythmic fluctuations in urination and defaecation. Sectral analysis of the data indicates a weekly rhythm which is attributed to the lack of neural stimuli at the weekend. Regression analysis using a weekly cycle illustrates this effect.
mesh_terms: D000818:Animals; D003672:Defecation; D004777:Environment; D010507:Periodicity; D051381:Rats; D014554:Urination