scholarly journals Effect of implantation of carbachol pellet near the suprachiasmatic nucleus on the free-running period of rat locomotor activity rhythm.

1987 ◽  
Vol 37 (2) ◽  
pp. 321-326 ◽  
Author(s):  
Tadashi FURUKAWA ◽  
Noboru MURAKAMI ◽  
Kiyohisa TAKAHASHI ◽  
Teiichi ETOH
Keyword(s):  
Locomotor Activity ◽  
Suprachiasmatic Nucleus ◽  
Activity Rhythm ◽  
Locomotor Activity Rhythm ◽  
Free Running ◽  
Free Running Period

Environmental factors influencing the free-running period of locomotor activity rhythm in blinded rats

1987 ◽  
Vol 5 ◽  
pp. S134
Author(s):  
Kiyohisa Takahashi ◽  
Mizuo Takashima ◽  
Ken Ohi ◽  
Naoto Yamada ◽  
Kazutaka Shimoda
Keyword(s):  
Locomotor Activity ◽  
Environmental Factors ◽  
Activity Rhythm ◽  
Locomotor Activity Rhythm ◽  
Factors Influencing ◽  
Free Running ◽  
Free Running Period

CHRONIC LEAD EXPOSURE ALTERS PHOTIC ENTRAINMENT OF LOCOMOTOR ACTIVITY RHYTHM AND NEURONAL PHOTOACTIVATION IN THE SUPRACHIASMATIC NUCLEUS OF THE ADULT RAT

2021 ◽  
pp. 101991
Author(s):  
Rosa María Vigueras-Villaseñor ◽  
Margarita Chávez-Saldaña ◽  
Daniel Landero-Huerta ◽  
Montes Sergio ◽  
Camilo Ríos ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Suprachiasmatic Nucleus ◽  
Lead Exposure ◽  
Activity Rhythm ◽  
Photic Entrainment ◽  
Locomotor Activity Rhythm ◽  
Adult Rat ◽  
Chronic Lead Exposure

Effects of aging on entrainment and rate of resynchronization of circadian locomotor activity

1992 ◽  
Vol 263 (5) ◽  
pp. R1099-R1103 ◽  
Author(s):  
P. C. Zee ◽  
R. S. Rosenberg ◽  
F. W. Turek
Keyword(s):  
Circadian Rhythm ◽  
Locomotor Activity ◽  
Activity Rhythm ◽  
Phase Advance ◽  
Middle Aged ◽  
Age Related ◽  
Free Running ◽  
Effects Of Aging ◽  
Free Running Period ◽  
Related Phase

The phase angle of entrainment of the circadian rhythm of the locomotor activity rhythm to a light-dark (LD) cycle was examined in young (2-5 mo old) and middle-aged (13-16 mo old) hamsters. An age-related phase advance in the onset of locomotor activity relative to lights off was seen during stable entrainment to a 14:10-h LD cycle. In addition, the effects of age on the rate of reentrainment of the circadian rhythm of locomotor activity were examined by subjecting young and middle-aged hamsters to either an 8-h advance or delay shift of the LD cycle. Middle-aged hamsters resynchronized more rapidly after a phase advance of the LD cycle than did young hamsters, whereas young hamsters were able to phase delay more rapidly than middle-aged hamsters. The age-related phase advance of activity onset under entrained conditions, and the alteration of responses in middle-aged hamsters reentraining to a phase-shifted LD cycle, may be due to the shortening of the free-running period of the circadian rhythm of locomotor activity with advancing age that has previously been observed in this species.

Splitting of the locomotor activity rhythm in rats by exposure to continuous light

1983 ◽  
Vol 244 (4) ◽  
pp. R573-R576 ◽  
Author(s):  
Phyllis W. Cheung ◽  
Charles E. McCormack
Keyword(s):  
Locomotor Activity ◽  
Estrous Cycle ◽  
Activity Rhythm ◽  
Continuous Light ◽  
Female Rats ◽  
Locomotor Rhythm ◽  
Estrous Cycles ◽  
Locomotor Activity Rhythm ◽  
Active Portion ◽  
Free Running

Female rats exposed to low intensities (0.1–1.5 lx) of continuous light (LL), displayed regular estrous cycles and free-running circadian rhythms of locomotor activity. In most rats, as the intensity of LL was increased to >2.0 lx, components within the active portion (α) of the locomotor rhythm remained synchronized as the periodicity of the rhythm lengthened. However, in a few rats agr split into two components; one of which free-ran with a period shorter than 24 h, while the other free-ran with a period longer than 24 h. As soon as the two components became maximally separated they spontaneously rejoined. In most rats, estrous cycles ceased shortly after the intensity of LL was increased to >2.0 lx even though the locomotor activity rhythm retained its unsplit free-running nature. These observations suggest that the multiple oscillators that control the rhythms of locomotor activity and the estrous cycle are normally coupled to one another. In certain intensities of LL, these oscillators uncouple and free-run with different periodicities, a condition which causes estrous cycles to cease and sometimes produces a split locomotor activity rhythm. circadian rhythm; oscillators; estrous cycle Submitted on November 9, 1981 Accepted on October 11, 1982

Clock genes outside the suprachiasmatic nucleus involved in manifestation of locomotor activity rhythm in rats

2000 ◽  
Vol 12 (12) ◽  
pp. 4206-4214 ◽  
Author(s):  
Satoru Masubuchi ◽  
Sato Honma ◽  
Hiroshi Abe ◽  
Kouji Ishizaki ◽  
Masakazu Namihira ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Suprachiasmatic Nucleus ◽  
Clock Genes ◽  
Activity Rhythm ◽  
Locomotor Activity Rhythm

CIRCADIAN LOCOMOTOR ACTIVITY AND ITS ENTRAINMENT BY FOOD IN THE CRAYFISH PROCAMBARUS CLARKI

1994 ◽  
Vol 190 (1) ◽  
pp. 9-21 ◽  
Author(s):  
F F De Miguel ◽  
H Aréchiga
Keyword(s):  
Locomotor Activity ◽  
Activity Rhythm ◽  
Food Reinforcement ◽  
Continuous Light ◽  
Food Delivery ◽  
Continuous Darkness ◽  
Locomotor Activity Rhythm ◽  
Activity Peak ◽  
Free Running ◽  
Two Peaks

The aim of our experiments has been to study the effect of light and food in the locomotor activity rhythm of the crayfish Procambarus clarki. Experiments were carried out under light:dark (LD) cycles of 12 h:12 h, under continuous darkness (DD) and under continuous light (LL). Under LD cycles, two peaks of activity were observed during the night phase of the cycle, while resting was characteristic of the day phase. Under DD or LL, it was possible to follow a free-running rhythm with a periodicity of 22.3±0.84 h in DD and 24.8±0.27 h in LL, typical of circadian rhythms of nocturnal species. A single delivery of food in the day phase of the LD cycle resulted in an outburst of locomotor activity that lasted for several hours. In the ensuing days, an activity peak appeared in phase with the time of food delivery. The food-related activity peak could be followed for up to 2 weeks without food reinforcement. Under DD and LL, food induced an activity rhythm in previously arrhythmic animals. Here the period was longer than 24 h in DD (26.2±0.12 h) and shorter in LL (22.5±0.46 h). Together, these results strongly suggest that light and food may play a role entraining a locomotor activity rhythm in crayfish.

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