Validation of two activity monitors in patients with COPD

Physical activity in daily life is increasingly used as an outcome measure in chronic respiratory disease. 1 Valid and user-friendly instruments are needed to quantify daily activity. 1 2 The DynaPort activity monitor (McRoberts, The Hague, The Netherlands) has been validated and used in patients with chronic obstructive pulmonary disease (COPD). All patients simultaneously wore the DynaPort, the SenseWear Pro (SenseWear, Body Media, Pittsburgh, USA) activity monitor (8.5x5.0x1.5 cm, 85 g), the DynaPort Minimod (Minimod, McRoberts, The Hague, The Netherlands) activity monitor (8.5x5.0x1.0 cm, 70 g) and a portable metabolic system (VmaxST 1.0, Viasys, MEDA, Belgium) during a 53 min protocol including different postures and activities (see table 2 in online supplement for a detailed description of the protocol).