This study evaluated the vibration characteristics of wheelchairs and a human body under actual driving conditions. We measured the vibration of the upper abdomen and under the seat using an electric wheelchair and a handle-type electric wheelchair. As a result, we found differences in the vibration characteristics depending on the road surface and the type of wheelchair. Under the seat, the vibration was attenuated by the tires and suspension, and a high frequency was observed. It was found that the vibration of the upper abdomen was close to the resonance frequency of the human body, and the vibration generated under the seat was outside the resonance range of the human body. In the measurement of the upper abdomen, we obtained the same frequency values as the previous study of the upper torso. Therefore, we propose this approach as one of the measurement methods. The results of this study will contribute to understanding the vibration characteristics of wheelchairs and a human body and to improving the comfort and quality of life of users.

  This study explores the introduction of a 3D printer into a geriatric health services facility to examine changes in occupational therapists’ awareness, skills, and clinical application of 3D printing technology. After six months, therapists reported increased access to information and improved operational knowledge. Some successfully used the printer for fabrication. However, new barriers were also identified, including limited time available during routine clinical care and difficulty with 3D design software. Despite these challenges, all participants recognized the value of 3D printing for providing customized support to patients. The findings suggest that while 3D printing holds clinical potential, institutional support and training systems are essential for its sustainable integration into occupational therapy practice.