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Role of hypoxemia for the cardiovascular responses to apnea during exercise.

Content Provider	Semantic Scholar
Author	Lindholm, Peter Nordh, Jessica Linnarsson, Dag
Copyright Year	2002
Abstract	We sought to define the role of hypoxemia in eliciting the cardiovascular responses to apnea during exercise. Eleven men performed repeated apneas during 100-W steady-state exercise, either with normoxic gas (air) or 95% oxygen (oxygen). Beat-by-beat arterial blood pressure, arterial oxygen saturation, and heart rate (HR) were determined, and stroke volume (SV) was estimated from impedance cardiography calibrated with soluble gas rebreathing. There were large interindividual variabilities of HR, mean arterial pressure (MAP), and total peripheral resistance (TPR) at end-apnea (ea). However, for each individual, HR(ea), MAP(ea), and TPR(ea) were highly correlated between air and oxygen (R = 0.94, 0.78, and 0.93). HR decreased and MAP increased faster during apnea with air than with oxygen (ANOVA, P < 0.05), but MAP(ea) was not different between conditions. Cardiac output was reduced by 33% with air and by 11% with oxygen (P < 0.001 for air vs. oxygen). We conclude that the hypoxemia component cannot account for the wide interindividual differences of HR and TPR responses to apnea. However, hypoxemia augments the HR and TPR responses and may limit the MAP response to apnea by preventing a bradycardia-associated increase of SV.
Starting Page	102
Ending Page	110
Page Count	9
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ajpregu.physiology.org/content/ajpregu/283/5/R1227.full.pdf
Alternate Webpage(s)	http://ajpregu.physiology.org/content/ajpregu/283/5/r1227.full.pdf
Alternate Webpage(s)	http://oxygenadvantage.com/wp-content/uploads/2017/02/Hypoxemia-and-Cardio-Response.pdf
Alternate Webpage(s)	http://ajpregu.physiology.org/content/ajpregu/early/2002/06/20/ajpregu.00036.2002.full.pdf
PubMed reference number	12376417v1
Volume Number	283
Issue Number	5
Journal	American journal of physiology. Regulatory, integrative and comparative physiology
Language	English
Access Restriction	Open
Subject Keyword	Apnea Bradycardia Cardiography, Impedance Cerebrovascular accident Gases Hypoxia In Situ Nick-End Labeling Oxygen saturation test result Quantitative impedance Sinoatrial Node Stroke Volume Total Peripheral Resistance cardiography
Content Type	Text
Resource Type	Article

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