{"title":"呼吸交换率","authors":"W. Kinnear, J. Blakey","doi":"10.1093/MED/9780198702467.003.0008","DOIUrl":null,"url":null,"abstract":"This chapter describes how the respiratory exchange ratio (RER) is calculated by dividing carbon dioxide output (VCO2) by the oxygen uptake (VO2). At the start of a cardiopulmonary exercise test (CPET), this ratio is less than 1.0. Once anaerobic metabolism starts to kick in, more carbon dioxide is produced from buffering of lactic acid and the RER starts to climb. At peak exercise, RER values of 1.4 or higher indicate that the subject’s effort is pretty maximal. An erratic RER trace is seen in dysfunctional breathing, when psychological, rather than physiological, processes are involved in controlling breathing.","PeriodicalId":102843,"journal":{"name":"A Practical Guide to the Interpretation of Cardiopulmonary Exercise Tests","volume":"11 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Respiratory exchange ratio\",\"authors\":\"W. Kinnear, J. Blakey\",\"doi\":\"10.1093/MED/9780198702467.003.0008\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This chapter describes how the respiratory exchange ratio (RER) is calculated by dividing carbon dioxide output (VCO2) by the oxygen uptake (VO2). At the start of a cardiopulmonary exercise test (CPET), this ratio is less than 1.0. Once anaerobic metabolism starts to kick in, more carbon dioxide is produced from buffering of lactic acid and the RER starts to climb. At peak exercise, RER values of 1.4 or higher indicate that the subject’s effort is pretty maximal. An erratic RER trace is seen in dysfunctional breathing, when psychological, rather than physiological, processes are involved in controlling breathing.\",\"PeriodicalId\":102843,\"journal\":{\"name\":\"A Practical Guide to the Interpretation of Cardiopulmonary Exercise Tests\",\"volume\":\"11 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2014-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"A Practical Guide to the Interpretation of Cardiopulmonary Exercise Tests\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1093/MED/9780198702467.003.0008\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"A Practical Guide to the Interpretation of Cardiopulmonary Exercise Tests","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1093/MED/9780198702467.003.0008","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
This chapter describes how the respiratory exchange ratio (RER) is calculated by dividing carbon dioxide output (VCO2) by the oxygen uptake (VO2). At the start of a cardiopulmonary exercise test (CPET), this ratio is less than 1.0. Once anaerobic metabolism starts to kick in, more carbon dioxide is produced from buffering of lactic acid and the RER starts to climb. At peak exercise, RER values of 1.4 or higher indicate that the subject’s effort is pretty maximal. An erratic RER trace is seen in dysfunctional breathing, when psychological, rather than physiological, processes are involved in controlling breathing.
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