Effects of wheel running on photoperiodic responses of Djungarian hamsters (Phodopus sungorus)
Effects of wheel running on photoperiodic responses of Djungarian hamsters (Phodopus sungorus)
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车轮运转对正加仓鼠 (Phodopus sungorus) 光周期反应的影响
DOI：
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
S. Steinlechner
中科院分区：
文献类型：
--
作者：
Frank Scherbarth;I. Petri;S. Steinlechner
将Djungarian仓鼠（Phodopus sungorus）暴露于人工短日照中，无论是否使用转轮（RW）。在6周内，RW仓鼠的体重显著增加，而对照组则表现出典型的体重减少。配对睾丸重量的估计表明RW仓鼠睾丸退化减速。随后将RW锁定9周导致RW动物的体重与对照组平行下降。在最初未锁定车轮的仓鼠中，日常麻木几乎完全消失。在RW再次解锁的最后阶段（3周），运动仓鼠的体重再次增加，而对照组体重达到最低点。与等负荷长日照（LD）对照组相比，RW仓鼠的相对肝脏重量显着增加，而相对心脏重量则不同。然而，后者往往高于久坐LD仓鼠。与SD对照组相比，运动短日照（SD）仓鼠的股骨延长证明了轮跑的生长刺激作用，并在连续LD条件下的进一步实验中通过运动诱导的体重升高表明轮跑的生长促进作用独立于光周期。
Djungarian hamsters (Phodopus sungorus) were exposed to artificial short days either with access to a running wheel (RW) or without. Within 6 weeks RW hamsters considerably increased their body mass, whereas controls showed the typical body mass reduction. Estimation of paired testis weights indicated a decelerated testis regression in RW hamsters. Subsequent locking of RWs for 9 weeks led to a decline in body mass of RW animals in parallel to controls. Daily torpor was almost completely missing in hamsters with initially unlocked wheels. During the final phase when RWs were again unlocked (3 weeks), body mass of exercising hamsters increased again, while controls reached the nadir in body mass. In comparison to equiponderate long-day (LD) controls the relative liver weight of RW hamsters was significantly increased unlike the relative heart weight. However, the latter tended to be higher than in sedentary LD hamsters. A growth-stimulating effect of wheel running was proven by elongated femora in exercising short-day (SD) hamsters compared to SD controls and suggested by exercise-induced elevation of body mass in a further experiment under continuous LD conditions, indicating a growth-promoting effect of wheel running independent from the photoperiod.
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