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- Title
Wearable pendant device monitoring using new wavelet-based methods shows daily life and laboratory gaits are different.
- Authors
Brodie, Matthew; Coppens, Milou; Lord, Stephen; Lovell, Nigel; Gschwind, Yves; Redmond, Stephen; Del Rosario, Michael; Wang, Kejia; Sturnieks, Daina; Persiani, Michela; Delbaere, Kim; Brodie, Matthew A D; Coppens, Milou J M; Lord, Stephen R; Lovell, Nigel H; Gschwind, Yves J; Redmond, Stephen J; Del Rosario, Michael Benjamin; Sturnieks, Daina L
- Abstract
Morbidity and falls are problematic for older people. Wearable devices are increasingly used to monitor daily activities. However, sensors often require rigid attachment to specific locations and shuffling or quiet standing may be confused with walking. Furthermore, it is unclear whether clinical gait assessments are correlated with how older people usually walk during daily life. Wavelet transformations of accelerometer and barometer data from a pendant device worn inside or outside clothing were used to identify walking (excluding shuffling or standing) by 51 older people (83 ± 4 years) during 25 min of 'free-living' activities. Accuracy was validated against annotated video. Training and testing were separated. Activities were only loosely structured including noisy data preceding pendant wearing. An electronic walkway was used for laboratory comparisons. Walking was classified (accuracy ≥97 %) with low false-positive errors (≤1.9%, κ ≥ 0.90). Median free-living cadence was lower than laboratory-assessed cadence (101 vs. 110 steps/min, p < 0.001) but correlated (r = 0.69). Free-living step time variability was significantly higher and uncorrelated with laboratory-assessed variability unless detrended. Remote gait impairment monitoring using wearable devices is feasible providing new ways to investigate morbidity and falls risk. Laboratory-assessed gait performances are correlated with free-living walks, but likely reflect the individual's 'best' performance.
- Subjects
WAVELETS (Mathematics); GAIT in humans; WEARABLE technology; CLINICAL trials; EVERYDAY life; WALKING; PATIENT monitoring equipment; ALGORITHMS; COMPARATIVE studies; DECISION trees; RESEARCH methodology; MEDICAL cooperation; MOTION; RESEARCH; SIGNAL processing; ACTIVITIES of daily living; EVALUATION research
- Publication
Medical & Biological Engineering & Computing, 2016, Vol 54, Issue 4, p663
- ISSN
0140-0118
- Publication type
journal article
- DOI
10.1007/s11517-015-1357-9