Department of Neurobiology, Care Sciences and Society, Division of Neurogeriatrics, Karolinska Institutet, 171 77, Stockholm, Sweden
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Defining accelerometer cut-points for different intensity levels in motor-complete spinal cord injury
- Published on June 26, 2019
The present aim was to define accelerometer cut-point values for wrist-worn accelerometers to identify absolute- and relative-intensity physical activity (PA) levels in people with motor-complete paraplegics (PP) and tetraplegics (TP).
Rehabilitation facility in Sweden.
The participants were 26 (19 men, 7 women) with C5–C8, AIS A and B (TP) and 37 (27 men, 10 women) with T7–T12 (PP), AIS A and B. Wrist-worn accelerometer recordings (Actigraph GT3X+) were taken during seven standardized activities. Oxygen consumption was measured, as well as at-rest and peak effort, with indirect calorimetry. Accelerometer cut-points for absolute and relative intensities were defined using ROC-curve analyses.
The ROC-curve analyses for accelerometer cut-points revealed good-to-excellent accuracy (AUC >0.8), defining cut-points for absolute intensity (2, 3, 4, 5, 6, 7 METs for PP and 2 to 6 METs for TP) and relative intensity (30, 40, 50, 60, 70, and 80% for PP and 40–80% for TP). The cut-points for moderate-to-vigorous physical activity was defined as ≥9515 vector magnitude counts per minute (VMC) for PP and ≥4887 VMC/min for TP.
This study presents cut-points for wrist-worn accelerometers in both PP and TP, which could be used in clinical practice to describe physical activity patterns and time spent at different intensity levels.
- Tobias Holmlund 1,2
- Elin Ekblom-Bak 3
- Erika Franzén 1,4
- Claes Hultling 1
- Kerstin Wahman 1,2
Rehab Station Stockholm/Spinalis R&D Unit, Frösundaviks allé 4 169 89, Solna, Sweden
Åstrand Laboratory of Work Physiology, The Swedish School of Sport and Health Sciences, Box 5626, 114 86, Stockholm, Sweden
Allied Health Professionals Function, Function Area Occupational Therapy & Physiotherapy, Karolinska University Hospital, 171 76, Stockholm, Sweden