A Biomechanical Assessment of Alternate Keyboards Using Tendon Travel
| Autor: | D. E. Treaster, W. S. Marras |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
musculoskeletal diseases
medicine.medical_specialty Anthropometric data Repeated measures design Kinematics Wrist musculoskeletal system Tendon Medical Terminology medicine.anatomical_structure Physical medicine and rehabilitation Joint angle Goniometer medicine Biomechanical assessment Simulation Medical Assisting and Transcription Mathematics |
| Zdroj: | Proceedings of the Human Factors and Ergonomics Society Annual Meeting. 44:685-688 |
| ISSN: | 1071-1813 2169-5067 |
| DOI: | 10.1177/154193120004400639 |
| Popis: | The goal of this study was to assess the effect of alternate keyboard designs on the tendon travel of the flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP). A repeated measures experiment was conducted with 10 keyboard conditions. Independent variables were Pitch (positive vs negative pitch), Roll (zero vs positive roll) and Yaw (zero vs positive yaw). Dependent variables were tendon travel with anthropometric data collected as covariates. Subjects also adjusted the Pitch, Roll and Yaw angles on an adjustable keyboard to their preference for one condition. Fifteen experienced touch typists (8 women, 7 men) typed a standard text. Wrist and finger goniometers, developed in the Biodynamics Laboratory at Ohio State University, provided data on joint kinematics for the wrist, MP, PIP, and DIP joints. Regression equations were used to calculate tendon travel from joint angle. Tendon travel was used as an indicator of the internal biomechanical loading. The results showed that alternate keyboards can change tendon travel by as much as 11%. Positive pitch keyboards produced significantly lower amounts of tendon travel than negative pitch. A highly significant Gender effect was also found: male subjects showed higher tendon travel across all test conditions. This gender difference was only partially explained by differences in hand anthropometry. |
| Databáze: | OpenAIRE |
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