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Figure 1


Fig. 1. Hypothetical mechanism for reduction of strain in a broad muscle. The anterior (red) and posterior (blue) margins of the muscle exhibit the most extreme strains, so we will consider these linear tensile elements as the boundaries of the parameter space (A). In a typical `untwisted' morphology (B), the anterior face inserts furthest from the joint and therefore experiences greater strains, likely resulting in suboptimal force production (the region of optimal force production is indicated by the vertical gray bar in B and C). Conversely, in the `twisted' conditions (C), the two faces undergo similar strains and therefore their force production capability is similar and high. The anterior/posterior coloring scheme used here is employed throughout the remainder of the figures. MTC, musculotendon complex.





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