Project Summary:
This study investigated the impact of using a support handle on lower arm muscle activity during riveting tasks. The research aimed to determine if a side handle can reduce fatigue and muscle activity, thereby mitigating risks such as Hand-Arm Vibration Syndrome (HAVS).
Electromyography (EMG) readings from four muscles (palmaris longus, flexor carpi radialis, extensor carpi radialis, and brachioradialis) were analyzed, along with subjective ratings of perceived exertion (RPE). Significant reduction in perceived exertion was observed when using a support handle, though only the flexor carpi radialis showed near-significant changes in muscle activity.
Collaborators: Abhiram Maddula and Mitchell Champagne.
Project Background:
HAVS is a significant occupational hazard affecting millions globally, particularly in industries requiring prolonged use of vibrating tools. Improper tool use increases the risk of HAVS and conditions like Raynaud’s phenomenon. This study evaluates how a side handle on a rivet gun affects muscle activity in the lower arm, aiming to provide ergonomic solutions to reduce fatigue and injury.
The experiment was set up in The Advanced Manufacturing and Machining Facility (AMMF) at Louisiana State University. Participants were tasked with riveting a series of aluminum sheets using a two-handed pistol grip technique, both with and without the aid of a horizontal side handle.
Riveting with and without Side Handle: Ergonomic Comparison
A Delsys Bagnoli Electromyography (EMG) device was used to measure and detect muscle activation using electrode sensors attached to the participant’s lower arm. Prolonged muscle activation is correlated with muscle fatigue increasing the chances of contracting work-related musculoskeletal disorders. With this study, we can investigate the ergonomic benefits of using a support handle between different gripping techniques. A post-test questionnaire was used to measure the perceived physical effort using Borg’s Rated Perceived Exertion (RPE) CR-10 Scale.
Surface electrodes on participant
Results:
The results showed significantly reduced muscle activity in the flexor carpi radialis muscle group while other muscle groups did not show significant differences.
Percentage Muscle Activity Change
The participants revealed that they perceived lower exertion levels performing the task with a side handle compared to those without using a handle.
Perceived Exertion level responses