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

Ambulatory assessment of shoulder abduction strength curve using a single wearable inertial sensor. Pietro Picerno, PhD; Valerio Viero, MSc; Marco Donati, PhD; Tamara Triossi, MSc; Virginia Tancredi, PhD; Giovanni Melchiorri, PhD. Aim

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

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  1. Ambulatory assessment of shoulder abduction strength curve using asingle wearable inertial sensor Pietro Picerno, PhD; Valerio Viero, MSc; Marco Donati, PhD; Tamara Triossi, MSc; Virginia Tancredi, PhD; Giovanni Melchiorri, PhD

  2. Aim • Assess reliability of using a single inertial measurement unit (IMU) for determining strength curves during isoinertial exercises. • Relevance • Strength curves have typically been measured with isometric and isokinetic dynamometers, which are expensive and cumbersome for clinicians.

  3. Method • 45 men and women without previous/current shoulder impairment and not involved in professional sports participated. • Seated subjects performed 1 consecutive shoulder abduction-adduction movement while holding 1 kg dumbbell. • Strength curve relative to shoulder abduction movement was assessed using wireless IMU fixed to upper arm.

  4. Results • High intraclass correlation coefficient values for range of motion and angular velocity. • Indicates high within-subject repeatability of task. • High waveform similarity of torque curves between trials. • With respect to isokinetic dynamometer, high IMU accuracy in estimating range of motion. • Error always <1.

  5. Conclusion • A single wearable IMU can effectively assess strength curves during isoinertial movements. • Clinicians could easily apply this method in ambulatory settings and, hence, use it as routine diagnostic tool for assessing functional joint recovery.

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