Quantitating Physical Activity in COPD Using a Triaxial Accelerometer

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Quantitating Physical Activity in COPD Using a Triaxial Accelerometer Bonnie G. Steele, PhD, RN, Lyn Holt, MS, Basia Belza, PhD, RN, Scott Ferris, MS, S. Lakshminaryan, MD, David M. Buchner, MD, MPH CHEST Volume 117, Issue 5, Pages 1359-1367 (May 2000) DOI: 10.1378/chest.117.5.1359 Copyright © 2000 The American College of Chest Physicians Terms and Conditions

Figure 1 Walking activity (VMU) associations with walking distance (in feet) in three consecutive 6-min walks. Pearson correlations and significance levels are indicated for each walk. CHEST 2000 117, 1359-1367DOI: (10.1378/chest.117.5.1359) Copyright © 2000 The American College of Chest Physicians Terms and Conditions

Figure 2 Accelerometer output (VMU) for three successive 6-min walks (y axis) conducted over a period of 70 min (x axis), with rest periods between each walk. X-activity, Y-activity, and Z-activity represent movement in anterior-posterior, vertical, and lateral planes, respectively. Vector magnitude depicts the integration of all planes. CHEST 2000 117, 1359-1367DOI: (10.1378/chest.117.5.1359) Copyright © 2000 The American College of Chest Physicians Terms and Conditions

Figure 3 Linear association between accelerometer activity at home (VMU) for 4 full days at home, and exercise capacity represented by the longest 6-min walk (in feet). The Pearson correlation was r = 0.74; p < 0.001. CHEST 2000 117, 1359-1367DOI: (10.1378/chest.117.5.1359) Copyright © 2000 The American College of Chest Physicians Terms and Conditions