Effect of temperature on the heart in the alligator.
Effect of temperature on the heart in the alligator.
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DOI：
10.1152/ajplegacy.1960.198.4.861
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发表时间：
1960-04
期刊：
影响因子：
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通讯作者：
C. Wilber
中科院分区：
文献类型：
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作者：
C. Wilber
研究人员给12条长18-30英寸的短吻鳄做了心电图。一些暴露在高温下；与对照组在22°C时的心电图进行比较，结果如下：心率40/min；P-R， 0.4秒；Q-T， 0.6秒；T， 0.24秒，0.05 mv；QRS， 0.04秒。心率随着结肠温度的升高而升高。在34°C时，速率变异性显著增加。超过40°C，心脏变得不规则，并受到不可逆转的损伤。T的持续时间随着温度的升高而缩短，至33℃左右，T的持续时间延长。鳄鱼的耐受性和一般行为的最佳温度在32°C和35°C之间，临界最大值为38°C。稍高于这个温度，心脏就会变得紊乱。目前的结果表明，鳄鱼的温度偏好是健全的心脏健康。
Electrocardiograms were taken on 12 alligators, 18–30 inches in length. Some were exposed to elevated temperatures; the resulting ECG's were compared with controls obtained at 22°C, which were as follows: rate, 40/min.; P-R, 0.4 seconds; Q-T, 0.6 seconds; T, 0.24 second, 0.05 mv; QRS, 0.04 second. Heart rate increased with increased colonic temperature. At 34°C there was marked increase in variability of rate. Above 40°C the heart became irregular and was damaged irreversibly. Duration of T decreased with elevated temperature to about 33°C above which T was prolonged. Optimal temperature for the alligator in terms of tolerance and general behavior is between 32°C and 35°C, with a critical maximum of 38°C. Slightly above that temperature the heart became disorganized. The present results suggest that the alligator's temperature preferendum is sound with respect to cardiac well being.