Chest
Clinical InvestigationsCOPDQuantitating Physical Activity in COPD Using a Triaxial Accelerometer
Section snippets
Materials and Methods
Two separate measurement conditions were used to estimate validity, reliability, and stability of the accelerometer in a sample of outpatients with stable, moderate to severe COPD. The first examined reliability and validity of the instrument to measure walking behavior during repeated 6MDWs; the second investigated validity of the accelerometer to measure daily activity over a 3-day period of continuous free-living at home, and stability of the measurement during this period.
Results
Twelve accelerometers were used, and each subject was assigned the same device for every measurement event. One unit malfunctioned due to failure of one of the three internal accelerometers during a measurement period at home, and the subject was retested with another device.
Discussion
This study evaluated reliability, validity, and stability of a triaxial accelerometer for measuring human movement in very sedentary COPD outpatients under two measurement conditions: the 6-min walk and during daily activity at home. The participants, most of whom had severe to very-severe obstructive disease,27 were similar to others studied at entry to pulmonary rehabilitation in terms of age, level of obstructive disease, symptom experience, and exercise capacity.13, 16 We determined that
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The research reported here was supported by the Department of Veterans Affairs, Veterans Health Administration, Health Services Research and Development Service (NRI 95-082.1). Dr. Steele is the Respiratory Clinical Nurse Specialist at VA Paget Sound Health Care Systems, Seattle, WA.