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- Title
CHANGES IN HEART RATE VARIABILITY DURING DIVING IN YOUNG HARBOR SEALS, PHOCA VITULINA.
- Authors
Greaves, Danielle K.; Hughson, Richard L.; Topor, Zbigniew; Schreer, Jason F.; Burns, Jennifer M.; Hammill, Michael O.
- Abstract
We studied changes in the patterns of heart rate variability (HRV) that coincide with the development of diving skills in harbor seal pups, Phoca vitulina. Heart rate measurements were collected remotely. Spectral analysis of HRV revealed power within a mid-frequency band (0.1-0.3 Hz) which was prominent, especially in pups less than 10 d of age. In these younger pups, the heart rate switched cyclically between a low and a high diving heart rate every 3-10 sec. Older pups exhibited a highly controlled diving bradycardia with a lower median and a lower variance when compared to younger individuals. These results provide new insight into the maturation of the bradycardia component of the dive response in harbor seal pups.
- Subjects
HARBOR seal; PHOCA; HEART beat; HEMODYNAMICS; BRADYCARDIA; ARRHYTHMIA
- Publication
Marine Mammal Science, 2004, Vol 20, Issue 4, p861
- ISSN
0824-0469
- Publication type
Article
- DOI
10.1111/j.1748-7692.2004.tb01197.x