In the design of working environment, only the function and the efficiency of manufacturing equipments are considered to device maximum efficiency, and the human characteristics of workers are neglected, then the working troubles will be occurred caused by increasing of the working load and decreasing of the working efficiency. Therefore, it is required to take care of the human characteristic for the design of good working environment.
　Recently, various digital human models have been studied and developed, which are utilized for the design of the working environment good for workers and the product gently for customers. Therefore, the digital human model, which can be express the human characteristics as much as possible, is required for the design and the evaluation of the working environment. In this study, the digital human model, which can evaluate the arm posture, the influence of each muscular power and muscular fatigue by integrating biarticular muscle and muscular fatigue models, is developed.

DESCENTE SPORTS SCIENCE Vol.29/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE