Validity of an Accelerometer-Based Activity Monitor System for Measuring Physical Activity in Frail Older Adults

in Journal of Aging and Physical Activity
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This study aimed to investigate the validity of the accelerometer-based DynaPort system to detect physical activity in frail, older subjects. Eighteen home-dwelling subjects (Groningen Frailty Indicator [GFI] score ≥ 4, ≥ 75 years) were included. Activities in their home environment were simultaneously observed by two researchers and measured with the DynaPort system during six consecutive hours. Primary outcome measures were the sensitivity and specificity of the DynaPort for locomotion (90% considered as sufficient agreement). Other outcome measures were overall agreement, and sensitivity and specificity for other activities. Sensitivity and specificity for locomotion were 83.3% and 100.0%, respectively. Overall agreement was 74.6%. Sensitivity was sufficient for sitting (94.4%), but not for lying and standing (59.2% and 69.6%, respectively). Specificity was sufficient for lying and standing (100.0% and 93.3%, respectively), but not for sitting (80.7%). In conclusion, the DynaPort system is not a valid method for assessing physical activity in frail, older subjects.

Hollewand, Spijkerman, Bilo, Kleefstra, and van Hateren are with the Diabetes Centre, Isala, Zwolle, the Netherlands. Bilo is also with the Department of Internal Medicine, University of Groningen and University Medical Center Groningen, Groningen, the Netherlands; and the Department of Internal Medicine, Isala, Zwolle, the Netherlands. Kleefstra is also with the Department of Internal Medicine, University of Groningen and University Medical Center Groningen, Groningen, the Netherlands; and Langerhans Medical Research Group, Zwolle, the Netherlands. Kamsma is with the Center for Human Movement Sciences, University of Groningen and University Medical Center Groningen, Groningen, the Netherlands.

Address author correspondence to Kornelis J.J. van Hateren at k.j.j.van. hateren@isala.nl.