Physical Activity Monitoring in Patients with Peripheral Arterial Disease: Validation of an Activity Monitor

H.J.P. Fokkenrood, N. Verhofstad, M.M.L. van den Houten, G.J. Lauret, C. Wittens, M.R.M. Scheltinga, J.A.W. Teijink*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Objectives: The daily life physical activity (PA) of patients with peripheral arterial disease (PAD) may be severely hampered by intermittent claudication (IC). From a therapeutic, as well as research, point of view, it may be more relevant to determine improvement in PA as an outcome measure in IC. The aim of this study was to validate daily activities using a novel type of tri-axial accelerometer (Dynaport MoveMonitor) in patients with IC. Methods: Patients with IC were studied during a hospital visit. Standard activities (locomotion, lying, sitting, standing, shuffling, number of steps and "not worn" detection) were video recorded and compared with activities scored by the MoveMonitor. Inter-rater reliability (expressed in intraclass correlation coefficients [ICC]), sensitivity, specificity, and positive predictive values (PPV) were calculated for each activity. Results: Twenty-eight hours of video observation were analysed (n = 21). Our video annotation method (the gold standard method) appeared to be accurate for most postures (ICC > 0.97), except for shuffling (ICC = 0.38). The MoveMonitor showed a high sensitivity (>86%), specificity (>91%), and PPV (>88%) for locomotion, lying, sitting, and "not worn" detection. Moderate accuracy was found for standing (46%), while shuffling appeared to be undetectable (18%). A strong correlation was found between video recordings and the MoveMonitor with regard to the calculation of the "number of steps" (ICC = 0.90). Conclusions: The MoveMonitor provides accurate information on a diverse set of postures, daily activities, and number of steps in IC patients. However; the detection of low amplitude movements, such as shuffling and "sitting to standing" transfers, is a matter of concern. This tool is useful in assessing the role of PA as a novel, clinically relevant outcome parameter in IC. (C) 2014 European Society for Vascular Surgery. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)194-200
Number of pages7
JournalEuropean Journal of Vascular and Endovascular Surgery
Issue number2
Publication statusPublished - Aug 2014


  • Activity monitor
  • Ambulatory activities
  • Intermittent claudication
  • Physical activity
  • GAIT

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