Biomechanical Relationships Between Manual Wheelchair Steering and the Position of the Human Body's Centre of Gravity.

The article presents the effects of manoeuvring a wheelchair with manual pushrim propulsion on the position of the centre of gravity of the human body during wheelchair movement. Twenty seven propulsion tests for wheelchairs moving at different trajectories were carried out as part of the study. The trajectories were 10 to 15 m long and reflected moving forward, reversing, turning left and right. A change in position of the centre of gravity of the human body was determined in each test. The trajectory of the centre of gravity of the human body was determined based on the wheelchair trajectory. The trajectories of the wheelchair and the centre of gravity were superimposed to show the effects of the movement caused by manoeuvring the wheelchair on changes in position of the centre of gravity of the human body in relation to the symmetry plane of the wheelchair. The tests showed the effects of wheelchair trajectory on position of the centre of gravity of the human body. As a result, a trajectory deviation factor, reflecting the shift of the human body weight to one side of the wheelchair.

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