Document Detail


Principal components analysis to evaluate ventilatory variability: comparison of athletes and sedentary men.
MedLine Citation:
PMID:  21052857     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The present work quantifies, through principal components analysis (PCA) the relationships among the variability of breath-by-breath ventilatory parameters [minute-ventilation (VE), tidal volume (Vt), and respiratory rate (FR)] during a maximal progressive exercise test. The results show that the first and second eigenvalues of the covariant matrix contains almost 90% of the variables' variance possible to see through the PCA, which means that the problem can be reduced by a two-dimensional analysis. The results show a close similarity between the global variability in two groups test, athletes and sedentary (control). For the athletes group, the parameter Vt is responsible for the high VE variability values while in the sedentary group the FR is more relevant for VE variability. The result improves the knowledge about respiratory variability during exercise, showing that Vt's and FR's variabilities contribute in different ways to global ventilation variability during a maximal cardiopulmonary exercise test in athletes and sedentary men.
Authors:
R R T Castro; M Magini; S Pedrosa; A R K Sales; A C L Nóbrega
Related Documents :
18076357 - Comparison of creatinine-based estimations of glomerular filtration rate in endurance a...
11224807 - Self-reported symptoms and exercise-induced asthma in the elite athlete.
20930987 - Post exercise ice water immersion: is it a form of active recovery?
3208777 - Induction of supraventricular tachyarrhythmia at rest and during exercise with transoes...
18006327 - Preoperative pulmonary rehabilitation in patients undergoing lung resection for non-sma...
2082357 - Effect of swimming to exhaustion, at low temperatures, on serum zn, cu, mg and ca in rats.
Publication Detail:
Type:  Journal Article     Date:  2010-11-04
Journal Detail:
Title:  Medical & biological engineering & computing     Volume:  49     ISSN:  1741-0444     ISO Abbreviation:  Med Biol Eng Comput     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7704869     Medline TA:  Med Biol Eng Comput     Country:  United States    
Other Details:
Languages:  eng     Pagination:  305-11     Citation Subset:  IM    
Affiliation:
Exercise Physiology Laboratory, National Institute of Traumatology and Orthopedics, Ministry of Health, Rio de Janeiro, RJ, 20230-024, Brazil.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

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


Previous Document:  Quantification of bradykinesia during clinical finger taps using a gyrosensor in patients with Parki...
Next Document:  Radiofrequency Ablation Versus Surgical Resection for Hepatocellular Carcinoma in Childs A Cirrhotic...