Abstract
The purpose of this study was to evaluate the rest-retest reliability and validity of a constant-load endurance exercise test on a cycle ergometer with a workload of 75% of maximal work capacity (W(max)) in patients with moderate to severe chronic obstructive pulmonary disease (COPD). In 60 patients with COPD (FEV(1) 40 +/- 15% pred), exercise endurance time was measured with a constant-load endurance exercise tests at 75% of W(max), on two different occasions. In a subgroup of 20 patients, test-retest reliability of the measurement of end-exercise ventilatory and metabolic responses was assessed. Validity of the cycle endurance test was assessed comparing endurance time and total work performed during the cycle endurance test to peak oxygen uptake (VO(2peak)) and the 12-minute walking distance (12MWD). Test and retest assessments of cycle endurance time did not differ statistically significantly (P =.40). Highly significant intraclass correlation coefficients (ICC > or = 0.85; P <.001) were found between test and retest of assessment of endurance time as well as of end-exercise ventilatory and metabolic responses. In addition, statistically significant correlation coefficients were found between VO(2peak) and endurance time (r = 0.50; P =.001) and total work performed (r = 0.72; P <.001) during the constant-load cycle test. Significant correlation coefficients of the same magnitude were found between 12MWD and endurance time (r = 0.58; P =.001) and total work performed (r = 0.72; P <.001) during the constant-load cycle test. It is concluded that constant-load exercise testing on a cycle ergometer with a workload of 75% of maximal work capacity is a reliable and valid method to assess exercise endurance in patients with COPD.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.