Development and Evaluation of a Simple Load Lifting Technique Applying Japanese Ancient Martial Arts

Abstract

Conventional ergonomics utilizes second-order control systems and three-dimensional models, but their complexity makes them unsuitable for practical development. In this paper, a simple mechanism for lifting objects by temporarily setting the load to zero was devised by applying basic techniques of kobujutsu (Japanese ancient martial arts). The accuracy of this mechanism was confirmed by simulation and experiment. This mechanism reveals that the speed of reflection of signals by the brain is important to essentially increase the output of human muscles, enabling efficient and simple movements. It is suggested that the method of lifting objects revealed in this paper is not limited to martial arts and other sports fields but could be applied to a wide range of fields such as nursing care and agricultural work. The development and evaluation of the simple object lifting technique demonstrated in this paper is expected to activate and improve the motor skills of the public and have a positive impact on health maintenance activities.

Development of Load-lifting-assist Mechanism Using Lower Limbs

“…The main difference between this and the previous study (11) is that an experiment was attempted to confirm reproducibility. The results of the experiments with this device confirmed the effectiveness of the thigh muscles as the source of power.…”

“…We also conducted experiments to faithfully reproduce the concept of the lifting technique. (11) In the discussion, we also summarize what was learned through the results obtained from this experiment.…”