Assessing the use of the steep ramp test in chronic obstructive pulmonary disease

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Date
2009-07Author
Chura, Robyn Lorraine
Type
ThesisDegree Level
MastersMetadata
Show full item recordAbstract
The purpose of this study was to compare power output and ventilatory measurements between the steep ramp test (SR) and both the 30-second Wingate anaerobic (WAT) and standard cardiopulmonary exercise tests (CPET) in chronic obstructive pulmonary disease (COPD). 11 patients (7 males and 4 females) underwent spirometry, a CPET, WAT and SR test. Repeated measures ANOVA was used to compare the differences between the peak work rate of the CPET (CPETpeak), SR (SRpeak), and the average power of the WAT (Wavg). The Wavg was higher than the SRpeak, which was higher than the CPET (231.2 ± 113.4, 156.8 ± 67.9, 65.9 ± 35.9, p>0.05 respectively). There were no differences found between the tests at end-exercise for inspiratory reserve volume (IRV), ventilation (VE), and end-expiratory lung volume (EELV). Tidal volume (VT) was also compared between the tests as a percentage of the inspiratory capacity (IC) remaining at end-exercise and no differences were found. The similarity between the ventilatory measures indicates a similar level of constraint, despite the large difference in work rates achieved, in all 3 tests. This shows that a standard CPET underestimates leg power in COPD patients, and the WAT and SR may be better indicators of leg muscle power and anaerobic type exercise.
Degree
Master of Science (M.Sc.)Department
MedicineProgram
MedicineSupervisor
Marciniuk, Darcy; Butcher, ScottCommittee
Cockcroft, Don; Busch, Angela; Sheppard, Suzanne; West, Nigel; Farthing, JonCopyright Date
July 2009Subject
ventilation
anaerobic
obstructive lung disease
graded exercise test
maximal exercise