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A Vibrotactile Feedback Device for Seated Balance Assessment and Training

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Published on: January 20, 2019

Evaluation of a dynamic armrest for hydraulic-actuation controller use.

T Murphy¹, M L Oliver

¹School of Engineering, University of Guelph, 50 Stone Road East, Guelph, Ontario, Canada.

Applied Ergonomics

|January 7, 2011

Summary

A new dynamic armrest design significantly reduced muscle strain during joystick operation compared to stationary or no armrests. Operators preferred the dynamic armrest for comfort and effectiveness.

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Area of Science:

Ergonomics
Human-Computer Interaction
Biomechanics

Background:

Joystick operation can lead to muscular strain in operators.
Existing armrest designs may not adequately support natural arm movements.
Optimizing armrest design is crucial for operator comfort and efficiency.

Purpose of the Study:

To evaluate the efficacy of a novel dynamic armrest for joystick operation.
To compare the dynamic armrest against stationary and no armrest conditions.
To assess the impact on operator muscle activation and subjective experience.

Main Methods:

Electromyography (EMG) was used to measure muscle activation.
Subjective feedback was collected via a questionnaire.
The study compared a dynamic armrest, stationary armrest, and no armrest.

Main Results:

The dynamic armrest significantly decreased muscle activation in the upper trapezius, posterior deltoid, and anterior deltoid (p ≤ 0.01).
Operators significantly preferred the dynamic armrest (p = 0.01), with 17 out of 21 choosing it.
Subjective ratings indicated the dynamic armrest required less effort, was more comfortable, and more effective.

Conclusions:

The dynamic armrest design effectively reduces muscular strain during joystick use.
Operator preference and perceived effectiveness strongly favor the dynamic armrest.
This design offers a significant ergonomic improvement for joystick operators.