Stroke effort and relative lung volume influence heart rate in diving sea lions RESEARCH ARTICLE

This study assessed the potential role of exercise and relative lung volume in the regulation of heart rate (fH) during dives of adult female California sea lions instrumented with electrocardiogram (ECG), depth and tri-axial acceleration data loggers. A positive relationship between activity (minimum specific acceleration) and fH throughout dives suggested increased muscle perfusion associated with exercise. However, apart from late ascent, fH during dives was still less than or equal to resting fH (on land). In addition, the activity–fH relationship was weaker in long, deep dives consistent with prioritization of blood oxygen conservation over blood oxygen delivery to muscle in those dives. Pulmonary stretch receptor reflexes may also contribute to fH regulation as fH profiles generally paralleled changes in relative lung volume, especially in shallower dives and during early descent and late ascent of deeper dives. Overall, these findings support the concept that both exercise and pulmonary stretch receptor reflexes may influence the dive response in sea lions.
Source: Journal of Experimental Biology - Category: Biology Authors: Tags: RESEARCH ARTICLE Source Type: research

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Source: Surgical Neurology International - Category: Neurosurgery Tags: Surg Neurol Int Source Type: research
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Source: Fight Aging! - Category: Research Authors: Tags: Newsletters Source Type: blogs
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Source: Dr. Smith's ECG Blog - Category: Cardiology Authors: Source Type: blogs
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Source: Frontiers in Endocrinology - Category: Endocrinology Source Type: research
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Source: Frontiers in Neurology - Category: Neurology Source Type: research
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Source: Dr. Smith's ECG Blog - Category: Cardiology Authors: Source Type: blogs
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Source: Advances in Experimental Medicine and Biology - Category: Research Tags: Adv Exp Med Biol Source Type: research
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Source: Journal of Psychophysiology - Category: Psychiatry & Psychology Source Type: research
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Source: Cardiophile MD - Category: Cardiology Authors: Tags: General Cardiology Source Type: blogs
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Source: Polish Journal of Neurology and Neurosurgery - Category: Neurosurgery Source Type: research
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