The cool pain and heat pain threshold may degrade or not differentiate when the increase of the rate of stimulus is not enough.
在刺激温度变化率增加不够大时，冷痛觉、热痛觉阈值可能随温度变化率增加而降低或无差别。
After the injection , cord dorsal potential(CDP) was determined on the 3rd day while heat pain threshold was measured each day.
观察注药3天内患肢和健肢的痛阈改变，并于第3天观察其脊髓背表面电位（CDP）的变化。
Using "Heat pain checker" to measure pain threshold in the different time, and to observe the changes of rat's behavior.
采用“热痛测试仪”测量不同用药量在不同时间的痛阈变化，并观察大鼠行为变化。
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