Periodic analysis of ultradian (40 min less than tau less than 24h) respiratory variations in laboratory vertebrates of various circadian activities.
Continuous recordings of respiratory gas exchanges of various laboratory endotherm vertebrate species, which have either a nocturnal (mouse, rat) or diurnal (monkey, quail, chicken) or equivocal (guinea-pig) maximal activity, kept under controlled environmental conditions of temperature, humidity, ventilation and provided with food and water ad libitum, show ultradian oscillations of mean and low frequencies (1 less than f less than 35 c.day-1). Harmonic analysis was used to assess periodic or random ultradian variations and to compute amplitudes and phases of these oscillations when these vertebrates were submitted to a light (100 lx) and dark circadian alteration (LD 12:12). Spectral analysis shows that a 100-lx continuous illumination or continuous darkness decreases circadian respiratory rhythms and increases these ultradian respiratory oscillations.
D000818:Animals; D002245:Carbon Dioxide / Q000502:physiology; D002645:Chickens; D002940:Circadian Rhythm; D003624:Darkness; D006168:Guinea Pigs; D008027:Light; D008252:Macaca fascicularis; D008297:Male; D051379:Mice; D010100:Oxygen / Q000502:physiology; D051381:Rats; D012119:Respiration; D013045:Species Specificity; D013057:Spectrum Analysis
D002245:Carbon Dioxide; D010100:Oxygen