Abstract
PURPOSE: The primary aims of this study were (1) to evaluate whole-body mechanical efficiency (ME) in a large group of chronic obstructive pulmonary disease (COPD) patients with a wide range of degrees of illness and (2) to examine how ME in COPD is related to absolute work rate and indices of disease severity during exercise testing.
METHODS: A total of 569 patients (301 male patients; GOLD stage I: 28, GOLD stage II: 166, GOLD stage III: 265, and GOLD stage IV: 110) with chronic obstructive pulmonary disease (COPD) were included in the data analysis. Individual maximal workload (watt), peak minute ventilation (V-E, L/min body temperature and pressure, saturated), and peak oxygen uptake (VO2, mL/min standard temperature and pressure, dry) were determined from a maximal incremental cycle ergometer test. Ventilatory and metabolic response parameters were collected during a constant work rate test at 75% of the individual maximal workload. From the exercise responses of the constant work rate test, the gross ME was calculated.
RESULTS: The mean whole-body gross ME was 11.0 +/- 3.5% at 75% peak power. The ME declined significantly (P
CONCLUSIONS: Gross ME in COPD was largely predicted by the absolute work rate (r =.87; P
Original language | English |
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Pages (from-to) | 146-153 |
Number of pages | 8 |
Journal | Journal of Cardiopulmonary Rehabilitation and Prevention |
Volume | 37 |
Issue number | 2 |
DOIs | |
Publication status | Published - Mar 2017 |
Keywords
- COPD
- exercise test
- mechanical efficiency
- CYCLING EFFICIENCY
- VASTUS LATERALIS
- LUNG-FUNCTION
- EXERCISE
- MUSCLE
- HYPERINFLATION
- COST
- METAANALYSIS
- PERFORMANCE