Document Detail

The measurement of respiratory and metabolic parameters of patients and controls before and after incremental exercise on bicycle: supporting the effort syndrome hypothesis?
MedLine Citation:
PMID:  10652636     Owner:  NLM     Status:  MEDLINE    
Hyperventilation (HV) occurring out of appropriate context, under some circumstances, can be potentially harmful to health. Nixon (1994) discusses convincingly the negative effects of long-term HV on the alkaloid buffering system and the potential challenge to a person's health status. Using capnography to measure respiration, percent expired CO2, to determine the anaerobic threshold during incremental exercise (the Effort Test), Nixon (1994) documented the onset of metabolic acidosis followed by alkalosis, secondary to the alkaloid buffering system response. Nixon (1994) hypothesized that recurring HV can lead to depletion of the alkaloid buffering system. By combining capnography, during the Effort Test, with analysis of blood gases and specific electrolytes, the effort-syndrome hypothesis was further tested in the present study. Thirteen patients with various kinds of stress-related problems were compared with four control participants. Pretest blood gases, from capillary blood, were collected after 10 minutes rest and 10 minutes of incremental exercise. Exhalation CO2, oxygen saturation, and traditional psychophysiological parameters were measured continuously during the experimental condition. Data from capillary blood and exhalation CO2 are reviewed. Change in patients' alkali buffering system supports the prediction made by Nixon (1994). The complexity of the data as well as methodological procedures of this study warrant a more sophisticated design, with more clearly defined functional analysis.
B H von Schéele; I A von Schéele
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied psychophysiology and biofeedback     Volume:  24     ISSN:  1090-0586     ISO Abbreviation:  Appl Psychophysiol Biofeedback     Publication Date:  1999 Sep 
Date Detail:
Created Date:  2000-02-08     Completed Date:  2000-02-08     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9712383     Medline TA:  Appl Psychophysiol Biofeedback     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  167-77     Citation Subset:  IM; S    
Stress Medicine AB, Bollnäs, Sweden.
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MeSH Terms
Alkalosis, Respiratory / physiopathology*
Blood Gas Analysis
Exercise / physiology*
Health Status
Hyperventilation / physiopathology*,  psychology
Stress, Psychological

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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