Cardiorespiratory and metabolic reactions during entrance into torpor in dormice, Glis glis.

摘要: SUMMARY Dormice voluntarily enter torpor at ambient temperatures ranging between 0–28°C. This study describes heart rate, ventilation frequency, O 2 -consumption (defined as metabolic rate), CO -production and body temperature during entrance into torpor. Their temporal relationship was analysed the time course of metabolic depression different temperatures. Body rate were measured in unrestrained dormice with implanted transmitter. Ventilation frequency monitored by total plethysmography or infrared video monitoring. To compare entries T a these periods were distinguished four phases: resting phase prior to torpor, phase pre-torpor adjustments, reduction and the steady state torpor. In phase, increased their ventilation, rate indicating that torpid state is initiated an enhanced activity for about hour. This was followed rapid metabolism rate, which reached their minimum values long before completed its decline. The results present show torpor is caused active respiratory, cardiac depression.