TY - JOUR
T1 - Time structure of locomotor activity in mice kept on different light - dark cycles
AU - Yang, Bo
AU - Liu, Yanyou
AU - Wang, Yuhui
AU - Wang, Yueqi
AU - Ling, Yanyal
AU - Jiang, Zhou
AU - Wang, Zhengrong
AU - Cornelissen-Guillaume, Germaine G
AU - Halberg, F.
PY - 2007/12/1
Y1 - 2007/12/1
N2 - Objective. This study investigates how the shortening or lengthening of the circadian period of the environmental lighting schedule affects the circadian and extra-circadian structure of locomotor activity in mice, with particular focus on the circasemiseptan, circaseptan, and circadecadian components with anticipated periods of about 3.5, 7, and 10 days, respectively. Methods. The locomotor activity of mice kept on different light - dark (LD) cycles was automatically monitored around the clock for about five weeks. The data were analyzed by linear - nonlinear rhythmometry. Results. As anticipated, in LD12:12, a prominent circadian rhythm was observed, with a marked 12-hour component qualifying the circadian waveform. By comparison, in LD10:10 and in LD14:14, the circadian rhythm had a reduced amplitude and a period close to that of the environmental synchronizer. Extra-circadian variation was then also demonstrated. In conclusion, circadian lighting schedules affect a broader-than-circadian time structure of locomotor activity in mice.
AB - Objective. This study investigates how the shortening or lengthening of the circadian period of the environmental lighting schedule affects the circadian and extra-circadian structure of locomotor activity in mice, with particular focus on the circasemiseptan, circaseptan, and circadecadian components with anticipated periods of about 3.5, 7, and 10 days, respectively. Methods. The locomotor activity of mice kept on different light - dark (LD) cycles was automatically monitored around the clock for about five weeks. The data were analyzed by linear - nonlinear rhythmometry. Results. As anticipated, in LD12:12, a prominent circadian rhythm was observed, with a marked 12-hour component qualifying the circadian waveform. By comparison, in LD10:10 and in LD14:14, the circadian rhythm had a reduced amplitude and a period close to that of the environmental synchronizer. Extra-circadian variation was then also demonstrated. In conclusion, circadian lighting schedules affect a broader-than-circadian time structure of locomotor activity in mice.
KW - Broader-than- circadian time structure
KW - Chronobiology
KW - Circadecadian (about 10 days)
KW - Circadian
KW - Circaseptan
KW - Linear-nonlinear rhythmometry
KW - Locomotor activity
KW - Ziwuliuzhu
UR - http://www.scopus.com/inward/record.url?scp=35348989640&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=35348989640&partnerID=8YFLogxK
U2 - 10.1080/09291010601049040
DO - 10.1080/09291010601049040
M3 - Article
AN - SCOPUS:35348989640
SN - 0929-1016
VL - 38
SP - 427
EP - 441
JO - Biological Rhythm Research
JF - Biological Rhythm Research
IS - 6
ER -