Journal of Rehabilitation Research & Development (JRRD)

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Volume 52 Number 2, 2015
   Pages 171 — 180

Ambulatory assessment of shoulder abduction strength curve using a single wearable inertial sensor

Pietro Picerno, PhD;1* Valerio Viero, MSc;2 Marco Donati, PhD;3 Tamara Triossi, MSc;2 Virginia Tancredi, PhD;2 Giovanni Melchiorri, PhD2,4

1Faculty of Psychology, School of Sport and Exercise Sciences, eCampus University, Novedrate, Italy; and Faculty of Medicine and Surgery, School of Sport and Exercise Sciences, University of Rome Tor Vergata, Rome, Italy; 2Department of Medicine Systems, Faculty of Medicine and Surgery, University of Rome Tor Vergata, Rome, Italy; 3Research and Development, Sensorize, Rome, Italy; 4Don Carlo Gnocchi Foundation, Milano, Italy

Abstract — The aim of the present article was to assess the reliability of strength curves as determined from tridimensional linear accelerations and angular velocities measured by a single inertial measurement unit (IMU) fixed on the upper arm during a shoulder abduction movement performed holding a 1 kg dumbbell in the hand. Within-subject repeatability of the task was assessed on 45 subjects performing four trials consisting of one maximal shoulder abduction-adduction movement. Intraclass correlation coefficient (ICC) was computed on the average movement angular velocity (VEL) and range of movement (ROM) across the four trials. Within-subject repeatability of torque curves was assessed in terms of waveform similarities by computing the coefficient of multiple determination (CMD). Accuracy of the estimated ROM was assessed using an isokinetic dynamometer. High ICC values of ROM (0.955) and VEL (0.970) indicated a high within-subject repeatability of the task. A high waveform similarity of torque curves was also found between trials (CMD = 0.867). Accuracy with respect to isokinetic dynamometer in estimating ROM was always <1 degree (p = 0.37). This study showed the effectiveness of using a single wearable IMU for the assessment of strength curve during isoinertial movements in a way that complies with the needs of clinicians in an ambulatory setting.

Key words: accelerometers, biomechanics, gyroscopes, inertial sensors, injury recovery, isoinertial, joints, rehabilitation, shoulder abduction, strength curves.


View HTML ?? View PDF ?? Contents Vol. 52, No. 2
This article and any supplementary material should be cited as follows:
Picerno P, Viero V, Donati M, Triossi T, Tancredi V, Melchiorri G. Ambulatory assessment of shoulder abduction strength curve using a single wearable inertial sensor. J Rehabil Res Dev. 2015;52(2):171–80.
http://dx.doi.org/10.1682/JRRD.2014.06.0146
ResearcherID: Pietro Picerno, PhD: D-7603-2015.
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