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首页> 外文期刊>American Journal of Physiology >Activity rhythm of golden hamster (Mesocricetus auratus) can be entrained to a 19-h light-dark cycle.
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Activity rhythm of golden hamster (Mesocricetus auratus) can be entrained to a 19-h light-dark cycle.

机译：金黄仓鼠（Mesocricetus auratus）的活动节奏可以带动至19小时的明暗循环。

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摘要

Both temporary access to a running wheel and temporary exposure to light systematically influence the phase producing entrainment of the circadian activity rhythm in the golden hamster (Mesocricetus auratus). However, precise determination of entrainment limits remains methodologically difficult, because such calculations may be influenced by varying experimental paradigms. In this study, effects on the entrainment of the activity pattern during successive light-dark (LD) cycles of stepwise decreasing periods, as well as wheel running activity, were investigated. In particular, the hamster activity rhythm under LD cycles with a period (T) shorter than 22 h was studied, i.e., when the LD cycle itself had been shown to be an insufficiently strong zeitgeber to synchronize activity rhythms. Indeed, it was confirmed that animals without a wheel do not entrain under 11:11-h LD cycles (T = 22 h). Subsequently providing hamsters continuous access to a running wheel established entrainment to T 22 h. Moreover, this paradigm underwent further reductions of the T period to T = 19.6 h without loss of entrainment. Furthermore, restricting access to the wheel did not result in loss of entrainment, while even entrainment to T = 19 h was observed. To explain this observed shift in the lower entrainment limit, our speculation centers on changes in pacemaker response facilitated by stepwise changes of T spaced very far apart, thus allowing time for adaptation.
机译：暂时接近跑轮和暂时暴露于光线都会系统地影响金仓鼠（Mesocricetus auratus）的昼夜活动节奏的产生。但是，精确确定夹带极限在方法上仍然很困难，因为这种计算可能会受到变化的实验范式的影响。在这项研究中，研究了在逐步减小的连续光暗（LD）循环期间，对轮毂活动模式的夹带以及车轮行驶活动的影响。尤其是，研究了LD周期（T）短于22 h的仓鼠活动节律，即当LD循环本身显示出不足以使活动节律同步的强度时。确实，已经证实没有轮子的动物在11：11-h LD周期（T = 22 h）下不会en带。随后，仓鼠连续进入运行轮，进入夹带至T 22 h。此外，这种范式在不损失夹带的情况下，将T周期进一步缩短至T = 19.6 h。此外，限制进入车轮不会导致夹带损失，而甚至观察到夹带到T = 19 h。为了解释这种在下夹带极限中的变化，我们的推测集中在起搏器响应的变化，这些变化是由相距很远的T的逐步变化促进的，从而使时间有适应性。

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