Abstract
This study was to investigate the relationship between the optimum diameter of hand rim and the ability of operation of wheelchair. The diameters of tested hand rims were 16, 22. 32 and 42mm. The optimum diameter of hand rim was 32mm. The ability tests were performed for 5m sprint on a level and a sloping floor, corner operation, meandering operation and tern operation, these tests were estimated the ability for muscle power, agility and dexterity. The operation of wheelchair improved at the optimum diameter compare with the pessimum diameter. The exerted force of the hand estimated from acceleration characteristics of the wheelchair was largest in operating the wheelchair with the optimum diameter. It was consider that the wheelchair with the optimum diameter surpassed in the ability of operation.
