温度对冬眠动物五道眉松鼠心脏功能的影响

Effect of Temperature on the Heart Function of the Five-Strip Eyebrow Squirrel

利用离体做功心脏模型 ,研究温度对哺乳类冬眠动物—五道眉松鼠心脏功能的影响。用四道生理记录仪测定不同温度下的生理参数 :左心室收缩压峰值 ( L VSP)、左心室舒张末期压 ( L VEDP)、左心室内压变化率峰值(± dp/ dtmax)。结果表明 ,五道眉松鼠心脏力学性能随温度的变化曲线与非冬眠动物相似 ,但其心脏收缩功能随温度的变化范围较大 。

This is an in vitro study designed to assess the effect of temperature variation on the heart function of the five-strip eyebrow squirrel-amammal of the hibernating kind.A heart model of exsomatizing action and for determining the physiological parameters with four physiological recorders was used to measure the LVSP,LVEDP and (±dP/dt max), respectively. It was found that the curves of the squirrel's heart mechanics property in relation to temperature variation are similar to the curves of the non-hibernating animals'. But, the squirrels' heart contraction function changes with in a much wider range,suggesting that their hearts are more tolerant of temperature variation.