Ultradian respiratory rhythms in groups of Sprague-Dawley rats of both sexes
Marotte, H.; Michot, J.L.; Stupfel, M.
Comptes Rendus des Seances de la Societe de Biologie et de ses Filiales 176(4): 469-473
1982
ISSN/ISBN: 0037-9026 PMID: 6217864 Document Number: 185795
Spectral analysis of the carbon dioxide emitted in controlled environmental conditions (temperature: 20-21 degrees C; humidity: 50-60%; lighting: 150 lux in LD12-12; background noise: 70 dB), by groups of 14 month old Sprague Dawleys, shows ultradian respiratory rates with periods of a 107-72 minute range for males and 107-45 minute for females. Moreover, VCO2 related to body weight is higher in females than in males.