Slow and fast orthodromic and antidromic variants in acute 9-h jet-lagged pygmy field mice.
Indian J Exp Biol
;
2014 May; 52(5): 460-466
Article
in English
| IMSEAR
| ID: sea-153721
ABSTRACT
Biological clocks help organism to adapt temporally to a variety of rhythmic environmental cues. Acute changes in the rhythmicity of entraining cues causes short- to long-term physiological distress in individuals, for example, those occurring during jet-lag after long-haul transmeridial flights, or shift work. Variations in the rate of re-entrainment to a 9 h advanced schedule (simulation of acute Jet-lag/shift work) in the Indian pygmy field mouse, Mus terricolor are reported. Wheel- and lab-acclimated adult male mice were entrained to a 1212 h lightdark (LD) cycles, followed by a 9 h advance in the LD cycle. In response, these mice either advanced or delayed their activity onsets, with individual variation in the rate and direction. Rapid orthodromic (advancing) re-entrainers exhibited a coincidence of activity onsets with the new dark onset in <=3 days, while gradually advancing re-entrainers took ~9 days or more. Delayers (antidromic) also either re-entrained very rapidly (<=2 days), or gradually (~9 days). Acrophase measurement confirmed the direction of the transients, which did not depend on the free-running period. Such different patterns might determine the differential survival of individuals under the pressure of re-entrainment schedules seen in jet-lag and shift work.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Male
/
Circadian Rhythm
/
Photoperiod
/
Jet Lag Syndrome
/
Actigraphy
/
Animals
/
Animals, Wild
/
Mice
Language:
English
Journal:
Indian J Exp Biol
Year:
2014
Type:
Article
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