Journal of Rehabilitation Research & Development (JRRD)

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Volume 53 Number 3, 2016
   Pages 487 — 498

Abstract — Capturing nighttime symptoms in Parkinson disease: Technical development and experimental verification of inertial sensors for nocturnal hypokinesia

Roongroj Bhidayasiri, MD, FRCP, FRCPI;1–2* Jirada Sringean, MD;1 Poonpak Taechalertpaisarn, EE;1 Chusak Thanawattano, PhD3

1Chulalongkorn Center of Excellence for Parkinson Disease & Related Disorders, Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand; 2Department of Rehabilitation Medicine, Juntendo University, Tokyo, Japan; 3Biomedical Signal Processing Laboratory, National Electronics and Computer Technology Center, Pathumthani, Thailand

Abstract — Although nocturnal hypokinesia represents one of the most common nocturnal disabilities in Parkinson disease (PD), it is often a neglected problem in daily clinical practice. We have developed a portable ambulatory motion recorder (the NIGHT-Recorder), which consists of 16-bit triaxial integrated microelectromechanical system inertial sensors that are specifically designed to measure movements, register the position of the body with respect to gravity, and provide information on rotations on the longitudinal axis while lying in bed. The signal processing uses the forward derivative method to identify rolling over and getting out of bed as primary indicators. The prototype was tested on six PD pairs to measure their movements for one night. Using predetermined definitions, 134 movements were captured consisting of rolling over 115 times and getting out of bed 19 times. Patients with PD rolled over significantly fewer times than their spouses (p = 0.03), and the position change was significantly smaller in patients with PD (p = 0.03). Patients with PD rolled over at a significantly slower speed (p = 0.03) and acceleration (p = 0.03) than their spouses. In contrast, patients with PD got out of bed significantly more often than their spouses (p = 0.02). It is technically feasible to develop an easy-to-use, portable, and accurate device that can assist physicians in the assessment of nocturnal movements of patients with PD.

Key words: accelerometers, ambulatory monitoring, getting out of bed, inertial sensors, nocturia, nocturnal akinesia, nocturnal hypokinesia, Parkinson disease, quality of life, rolling over, sleep.


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