Pulmonary gas exchange is reduced by the cardiovascular diving response in resting humans
| Autor: | Gustaf Biasoletto-Tjellström, Erika Schagatay, Johan Andersson |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Pulmonary and Respiratory Medicine
Bradycardia Adult Male medicine.medical_specialty Heart disease Adolescent Physiology Diving Rest Blood Pressure Cardiovascular System Electrocardiography Heart Rate Internal medicine Immersion medicine Humans Lactic Acid Respiratory system Biological sciences Lung business.industry Pulmonary Gas Exchange General Neuroscience Gas exchange medicine.disease medicine.anatomical_structure Breath Tests Cardiology medicine.symptom business human activities Vasoconstriction |
| Zdroj: | Respiratory physiologyneurobiology. 160(3) |
| ISSN: | 1569-9048 |
| Popis: | The diving response reduces the pulmonary O(2) uptake in exercising humans, but it has been debated whether this effect is present at rest. Therefore, respiratory and cardiovascular responses were recorded in 16 resting subjects, performing apnea in air and apnea with face immersion in cold water (10 degrees C). Duration of apneas were predetermined to be identical in both conditions (average: 145 s) and based on individual maximal capacity (average: 184 s). Compared to apnea in air, an augmented diving response was elicited by apnea with face immersion. The O(2) uptake from the lungs was reduced compared to the resting eupneic control (4.6 ml min(-1)kg(-1)), during apnea in air (3.6 ml min(-1)kg(-1)) and even more so during apnea with face immersion (3.4 ml min(-1)kg(-1)). We conclude that the cardiovascular adjustments of the diving response reduces pulmonary gas exchange in resting humans, allowing longer apneas by preserving the lungs' O(2) store for use by vital organs. |
| Databáze: | OpenAIRE |
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