Effects of season and temperature acclimation on electrocardiogram and heart rate of toads
| Autor: | Victoria Chapovetsky, Uri Katz |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Male
Physiology Acclimatization Cardiac activity Biology Biochemistry Body Temperature Electrocardiography QRS complex Animal science Heart Rate Botany Heart rate medicine Animals Molecular Biology Bufo viridis medicine.diagnostic_test Temperature Thermoregulation Bufonidae Poikilotherm Female Seasons Body Temperature Regulation |
| Zdroj: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 134:77-83 |
| ISSN: | 1095-6433 |
| Popis: | Electrocardiogram (ECG) was recorded from unrestrained toads of two species, one resistant (Bufo viridis) and the other sensitive (B. regularis) to low temperatures. Although the temperature-sensitive species could not survive at temperatures below 7-8 degrees C, heart rate is linearly and similarly related to ambient temperature in the two species. In B. viridis, the cold resistant species, heart rate in winter was 25% lower than in summer, and the dependency of heart rate on temperature was reduced by 50% in toads acclimated to 10 degrees C in winter. It was not possible to disclose any effect of acclimation on heart rate in summer, due to the large variation in the recorded values. The QRS amplitude in the ECG was considerably reduced at low temperature only in B. viridis. It is concluded that differences in cardiac activity cannot account for the distinct difference in thermal relations of the two species, and that it should reside at other regulatory levels. |
| Databáze: | OpenAIRE |
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