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

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 simultaneou...

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Bibliographic Details
Published in:Journal of aging and physical activity 2016-10, Vol.24 (4), p.555-558
Main Authors: Hollewand, Anne M, Spijkerman, Anouk G, Bilo, Henk J G, Kleefstra, Nanne, Kamsma, Yvo, van Hateren, Kornelis J J
Format: Article
Language:English
Subjects:
Accelerometry
Aged
Aged, 80 and over
Agreements
Cross-Sectional Studies
Exercise
Female
Frail
Frail Elderly
Geriatric Assessment - methods
Home environment
Humans
Locomotion
Lying
Male
Netherlands
Older people
Physical activity
Sensitivity and Specificity
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Summary: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.
ISSN:1063-8652
1543-267X
DOI:10.1123/japa.2014-0290