TY - JOUR T1 - Validity of 6 activity monitors during standard physical activities in COPD – Comparison with indirect calorimetry JF - European Respiratory Journal JO - Eur Respir J VL - 38 IS - Suppl 55 SP - 3253 AU - Yogini Raste AU - Daniel Langer AU - Chris Burtin AU - Zafiris Louvaris AU - Santiago Giavedoni AU - Francesco Costa AU - Frederick Wilson AU - Roberto Rabinovich AU - Nicholas Hopkinson AU - Ioannis Vogiatzis AU - Barry Peterson AU - Thierry Troosters Y1 - 2011/09/01 UR - http://erj.ersjournals.com/content/38/Suppl_55/3253.abstract N2 - Background: Reduced physical activity is an important feature of COPD. A range of monitors are available, but the validity of their various output parameters is not well established for patients with chronic diseases. The IMI PROactive project evaluated 6 activity monitors: SenseWear (SW); RT3; Actiwatch (AW); Actigraph (AG); Dynaport Minimod (MM) and Lifecorder Kenz (KZ).Methods: 40 patients (GOLD stage 1-4; Age 67±7, FEV1 56±18%pred, 6MWD 430±127) were recruited in 4 centres. Patients wore all activity monitors and a portable metabolic system and performed a 1 hour standard activity set (including walking, standing, stair climbing and upper limb tasks). Activity intensity (METs), assessed by indirect calorimetry, was compared to activity monitor outcomes. Average VO2 during the protocol was also calculated (8.78±1.72 ml min-1 kg-1) and compared to activity monitor outputs; METs (SW, MM); activity counts or Vector Magnitude Units, VMU (AW, AG, RT3); or a general activity outcome (KZ).Results: Table 1 gives median (IQR) for Pearson correlation between VO2 and activity monitor outcomes and that between mean METS over the study and mean activity monitor output.View this table:Table 1Conclusion: The MM, SW, RT3 and AG give acceptable estimates of minute-by-minute variation in metabolic activity during physical activity. SW, MM, AW and KZ show acceptable correlations between overall metabolic activity and monitor output. These findings could guide users in choosing valid activity monitors for research or clinical questions. ER -