Jacob K. Sont*, Dept. of Medical Decision Making, Leiden University Medical Center, Leiden, Netherlands Martijn Vooijs, Cardiac and Pulmonary Rehabilitation, Rijnlands Rehabilitation Center, Leiden, Netherlands Jiska B. Snoeck-Stroband*, Dept. of Medical Decision Making, Leiden University Medical Center, Leiden, Netherlands Laurence L. Alpay, Healthy for Life, TNO, Leiden, The Netherlands, Leiden, Netherlands Thijs Beerthuizen, Dept. of Medical Decision Making, Leiden University Medical Center, Leiden, Netherlands Jannie J. Abbink, Cardiac and Pulmonary Rehabilitation, Rijnlands Rehabilitation Center, Leiden, Netherlands A. (Ton) J.m. Rövekamp, Healthy for Life, TNO, Leiden, The Netherlands, Leiden, Netherlands Track: Research Presentation Topic: e-Coaching Presentation Type: Poster presentation Submission Type: Single Presentation Last modified: 2013-09-25

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Rationale: Physical inactivity in daily life is a prominent feature in patients with COPD. Therefore, improving physical activity (PA) is an important component of adequate disease management in COPD. Self-monitoring with accelerometers might provide patients with the information and feedback needed for goal setting of PA as part of internet-based self-management support.

Aim: To assess the validity of self-monitoring of PA with 2 low-cost internet enabled accelerometers as compared to a well validated multi-sensor device in patients with COPD.

Methods: During 5 consecutive days, PA was monitored in 9 patients with COPD (5M/4F; FEV1%pred (SD): 51.1 (20.5); GOLD stage 1-4) involved in an outpatient, multidisciplinary pulmonary rehabilitation program at the Rijnlands Rehabilitation
Centre in Leiden. PA was assessed by 2 internet accelerometers (Fitbit (Fitbit Inc.) or Physical Activity Monitor AM300 (PAM B.V. Doorwerth, NL)) and the SenseWearâ„¢ Armband (BodyMedia, Inc. Pittsburgh, PA) as gold standard. PA was expressed as mean metabolic equivalent (MET) level per 3 hr periods and was adjusted for the individual patient by linear regression. Agreement of mean METs / 3 hrs between internet accelerometers and the gold standard was analyzed by the intra-class correlation coefficient (ICC) and Bland-Altman plots.

Results: The figure (https://www.patientcoach.nl/Medicine2.0_2013_abstract_Sont) shows the Bland-Altman plots of the agreement in estimated mean METs/3hr between Fitbit and PAM internet accelerometers and SenseWear Armband, respectively. There was good agreement between METs from SenseWear Armband and METs estimated by Fitbit (ICC = 0.79) and PAM internet accelerometers (ICC = 0.70), respectively.
Conclusion: Low cost internet enabled accelerometers provide valid and useful estimates of within-person differences in metabolic equivalent (MET) level over 3 hr periods in patients with COPD.

Implication: These devices may be useful in cost-effective interventions aiming to increase PA levels by providing information and feedback for individual goal setting as part of internet-based self-management support in patients with COPD.

This study was supported by a grant from the Netherlands Asthma Foundation (grant number: 3-4-11-063).