| Incremental Exercise Using Progressive Versus Constant Pedaling Rates: A Study in Cardiac Patients. | |
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MedLine Citation:
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PMID: 21606845 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE:: Cardiopulmonary exercise testing is widely used in clinical assessment and exercise prescription. However, significant differences in physiological responses can occur depending on testing protocol. The aim of this study was to evaluate the cardiopulmonary responses to different incremental cycle pedaling cadences in cardiac patients. METHODS:: Eleven men with coronary artery disease (CAD) and 12 men with chronic heart failure (CHF) performed 2 maximal cycle tests at constant cadence (60-70 rpm, at fixed cadence) and at progressive cadence. Peak values for oxygen uptake (VO2peak), workload (Wpeak), and heart rate (HRpeak); ventilatory threshold (VT); and the oxygen uptake (VO2) per unit work rate (WR) increment (ΔVO2/ΔWR) obtained using 2 protocols were determined. RESULTS:: VO2peak and Wpeak, respectively, were higher during increasing cadence (INCR) compared with fixed cadence (FIX) protocol both in patients with CAD (32.7 ± 5.4 vs 28.1 ± 7.0 mL · kg · min, P = .01; 214 ± 42 vs 150 ± 28 W, P = .001) and in patients with CHF (20.3 ± 7.4 vs 17.2 ± 5.5 mL · kg · min, P .006; 133 ± 45 vs 104 ± 33 W, P = .005). No differences were seen in HRpeak. Both in patients with CAD and in patients with CHF, VO2 (21.7 ± 5.5 vs 16.8 ± 5.3 and 12.3 ± 7.4 vs 9.3 ± 2.8 mL · kg · min) and HR (114 ± 14 vs 98 ± 13 and 92 ± 17 vs 80 ± 17 bpm) at VT were significantly higher in INCR than in FIX protocol. No differences were seen in workload at VT. ΔVO2/ΔWR during INCR protocol were higher in patients with CAD (13.4 ± 1.8 vs 9.5 ± 2.6 mL · kg · W, P = .006) and patients with CHF (13.6 ± 4.1 vs 8.7 ± 1.9 mL · kg · W, P = .006). DISCUSSION:: These findings indicate that in tests at fixed cadence, there occurs an earlier activation of the anaerobic mechanisms leading to a premature exhaustion before a cardiopulmonary endpoint has been achieved. |
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Authors:
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Giovanni Grazzi; Francesco Conconi; Jonathan Myers; Gianni Mazzoni; Simone Uliari; Alessandro Fucili; Claudio Ceconi |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-20 |
Journal Detail:
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Title: Journal of cardiopulmonary rehabilitation and prevention Volume: - ISSN: 1932-751X ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-5-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101291247 Medline TA: J Cardiopulm Rehabil Prev Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Center of Biomedical Studies Applied to Sport, University of Ferrara, Ferrara, Italy (Drs Grazzi, Conconi, Mazzoni, and Uliari); Department of Cardiology, University of Ferrara, Ferrara, Italy (Drs Fucili and Ceconi); and Veterans Affairs Palo Alto Health Care System, Palo Alto, California (Dr Myers). |
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