Document Detail

Comparison of Cardiopulmonary Responses During Two Incremental Step Tests in Patients With COPD.
MedLine Citation:
PMID:  22709990     Owner:  NLM     Status:  Publisher    
BACKGROUND: It is well established that the Work rate increment size affects the duration of test and physiological responses to exercise during cycling in patients with COPD. However, this has never been tested for incremental step tests. OBJECTIVE: To compare the exercise tolerance time, cardiopulmonary stress, and perception of effort between the Chester step test (CST) and a modified incremental step test (MIST). METHODS: Thirty-two patients with COPD (FEV₁: 50 ± _15% of predicted) were randomized to perform the CST and MIST at the same day, an hour apart, on a single step (20 cm of high). During tests pulmonary gas exchange was measured continuously by a portable metabolic system. RESULTS: CST had shorter duration and also lower number of steps in comparison with MIST. However, similar cardiopulmonary responses were observed at exercise peak: VO₂ (1.22 ± _0.59 L/min vs 1.24 ± _0.55 L/min), VE/MVV (0.63 ± _0.14 vs 0.61 ± _0.14), HR (86 ± _13% vs 85 ± _13%) and SpO₂ (87 ± _7% vs 87 ± _6%). Dyspnoea and leg fatigue scores when correcting for exercise duration were higher for CST. CONCLUSION: The slower the Work rate increment during step test the higher is the exercise tolerance. Regardless of the Work rate increment, cardiopulmonary stress and exertion effort at peak exercise were equivalent between tests.
Ch de Andrade; Aa de Camargo; Bp de Castro; Carla Malaguti; Simone Dal Corso
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-15
Journal Detail:
Title:  Respiratory care     Volume:  -     ISSN:  0020-1324     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7510357     Medline TA:  Respir Care     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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