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A study investigating the validity of an accelerometer in quantification of step count in adult hospital inpatients recovering from critical illness

Anderson, J., Yoward, L S and Green, A. (2019) A study investigating the validity of an accelerometer in quantification of step count in adult hospital inpatients recovering from critical illness. Clinical Rehabilitation.

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Yoward Main article 5_1_19 (1).pdf - Accepted Version

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Abstract

Objective: To determine the validity of the Actigraph GT3X accelerometer in step count quantification when compared to observed step count in hospitalised adults recovering from critical illness.
Setting: Large NHS Hospitals Trust. Subjects: Twenty hospital ward-based adults (age: mean 62.3, SD 11.5) who had required greater than 48 hours of mechanical ventilation in the intensive care unit.
Main measures: Participants walked self-selected distances and speeds as part of a semi-structured movement protocol not exceeding three hours. Two Actigraph GT3X accelerometers were worn, one on the thigh and one on the ankle of the non-dominant leg. Accelerometer recorded step counts were compared against observed step counts.
Results: Thirty-one separate walking episodes were analysed. A mean (SD) of 45.87 (± 19.72) steps was calculated for observed step count (range 15 - 90). Mean differences (95% limits of agreement) of -0.84 steps (-3.88 to 2.2) for the ankle placement and -17.7 steps (-40.63 to 5.25) for the thigh were calculated. Intraclass correlation coefficients (95% confidence intervals) of 0.99 (0.99-1.0) and 0.46 (-0.1-0.78) were determined for the ankle and thigh respectively. Placement sites were well tolerated by 95% of participants.
Conclusion: An ankle mounted Actigraph GT3X accelerometer demonstrates validity in quantification of step count in hospitalised adults recovering from critical illness. A thigh placement was not considered valid.

Item Type: Article
Status: Published
DOI: https://doi.org/10.1177/0269215519829893
Subjects: R Medicine > RM Therapeutics. Pharmacology > RM695 Physical therapy. Occupational therapy
School/Department: School of Health Sciences
URI: http://ray.yorksj.ac.uk/id/eprint/3689

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