Abstract

Muscles of creatures have bundle structure consisting of a large number of thin muscle fibers. Using a bundle of thin McKibben muscles, we have developed a multifilament muscle that has characteristics similar to those of human muscles. It is reported that bundling thin McKibben muscles causes physical interaction between muscle fibers with their radical expansion, resulting in the increase of the muscle contraction ratio. It is only confirmed as an experimental result. In this paper, we propose a simple model to reveal this interesting phenomenon. The analytical result successfully expresses the increase in contraction due to bundling thin McKibben muscles.

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