Abstract
The mechanical performance of electrically driven right ventricular myocardium from guinea pig, rat, hamster, and ground squirrel was studied in vitro at temperatures from 1° to 36°C. Tissue from hibernating specimens (ground squirrels and hamsters) demonstrated significantly better performance (less diminution in isometric tension, and lower arrest temperatures) at low temperature than did myocardium from nonhibernating species (guinea pig and rat). However, myocardium from nonhibernating hamsters was demonstrably less tolerant of low temperatures than was tissue from hibernating specimens, which suggests that a significant adaptation had taken place in individuals entering hibernation. In contrast, no significant difference between hibernating and nonhibernating ground squirrel myocardium was demonstrated. The myocardial force-frequency relationship was found to be quite sensitive to temperature in guinea pigs and hamsters but relatively resistant in rats and ground squirrels.
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