J Electromyogr Kinesiol, 2022 · DOI: 10.1016/j.jelekin.2019.05.019 · Published: February 1, 2022
This study investigates how using geared wheels on manual wheelchairs affects the shoulder joints and muscles of veterans with spinal cord injuries while wheeling on carpet. The study compares standard (1:1) and low gear (1.5:1) conditions, measuring hand-rim kinetics, shoulder joint dynamics, and muscle activity. The goal is to see if geared wheels can reduce the strain on shoulders, potentially helping users maintain independence and reduce injuries.
The use of geared wheels, particularly in low gear, can significantly reduce the peak forces and moments experienced at the shoulder joint during wheelchair propulsion on carpet, potentially lowering the risk of injury.
By decreasing the physical demands of propulsion, geared wheels may allow wheelchair users to maintain independent mobility within their homes and communities for a longer period.
While geared wheels reduce shoulder strain, they also decrease propulsion speed and stroke distance, requiring more frequent stroke cycles. This trade-off should be considered based on individual user needs and priorities.