THE CATECHOLAMINE RESPONSE TO GRADED HIGH-ALTITUDE FLIGHT IN YELLOW-RUMPED WARBLERS (

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Tác giả: Morag F Dick, Christopher G Guglielmo, Catherine M Ivy, Melanie Qu, J Kevin Shoemaker, Kevin G Young

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: United States : American journal of physiology. Regulatory, integrative and comparative physiology , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 24603

Chronic exposure to low oxygen (hypoxia) leads to amplification of the hypoxic chemoreflex, increasing breathing and sympathetic nervous system (SNS) activation. Prolonged SNS activation redistributes blood to hypoxia-sensitive tissues, away from muscles. Recent tracking studies have shown that migratory songbirds can fly 5,000 m or higher above sea level, leading us to hypothesize that migratory birds may have a blunted hypoxic chemoreflex to maintain blood flow to muscles during migratory flight at high altitudes. To test this hypothesis, we used a hypobaric wind tunnel and measured circulating plasma catecholamines after maximal altitude flight, flight at 75% of maximal altitude, flight at ground level (~250 m), and after rest at 75% of maximal altitude and ground level in migratory myrtle yellow-rumped warblers (
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