Title: Validity of six activity monitors in chronic obstructive pulmonary disease: a comparison with indirect calorimetry
Authors: Van Remoortel, Hans ×
Raste, Yogini
Louvaris, Zafeiris
Giavedoni, Santiago
Burtin, Chris
Langer, Daniel
Wilson, Frederick
Rabinovich, Roberto
Vogiatzis, Ioannis
Hopkinson, Nicholas S
Troosters, Thierry
PROactive consortium #
Issue Date: 2012
Publisher: Public Library of Sciene
Series Title: PLoS One vol:7 issue:6
Article number: e39198
Abstract: Reduced physical activity is an important feature of Chronic Obstructive Pulmonary Disease (COPD). Various activity monitors are available but their validity is poorly established. The aim was to evaluate the validity of six monitors in patients with COPD. We hypothesized triaxial monitors to be more valid compared to uniaxial monitors. Thirty-nine patients (age 68±7 years, FEV(1) 54±18%predicted) performed a one-hour standardized activity protocol. Patients wore 6 monitors (Kenz Lifecorder (Kenz), Actiwatch, RT3, Actigraph GT3X (Actigraph), Dynaport MiniMod (MiniMod), and SenseWear Armband (SenseWear)) as well as a portable metabolic system (Oxycon Mobile). Validity was evaluated by correlation analysis between indirect calorimetry (VO(2)) and the monitor outputs: Metabolic Equivalent of Task [METs] (SenseWear, MiniMod), activity counts (Actiwatch), vector magnitude units (Actigraph, RT3) and arbitrary units (Kenz) over the whole protocol and slow versus fast walking. Minute-by-minute correlations were highest for the MiniMod (r = 0.82), Actigraph (r = 0.79), SenseWear (r = 0.73) and RT3 (r = 0.73). Over the whole protocol, the mean correlations were best for the SenseWear (r = 0.76), Kenz (r = 0.52), Actigraph (r = 0.49) and MiniMod (r = 0.45). The MiniMod (r = 0.94) and Actigraph (r = 0.88) performed better in detecting different walking speeds. The Dynaport MiniMod, Actigraph GT3X and SenseWear Armband (all triaxial monitors) are the most valid monitors during standardized physical activities. The Dynaport MiniMod and Actigraph GT3X discriminate best between different walking speeds.
ISSN: 1932-6203
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Academic Centre for Nursing and Midwifery
× corresponding author
# (joint) last author

Files in This Item:
File Description Status SizeFormat
Plos One van remoortel 2012.pdfOA article Published 586KbAdobe PDFView/Open


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science