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The latissimus dorsi muscle is "twisted upon itself, so that the superior fibers become at first posterior and then inferior, and the vertical fibers at first anterior and then superior". Does it mean that this muscle double twists in an arm flexation instead of untwist?
Does this twisting affect how the muscle functions during arm flexation?
It's possible that the twisting of the latissimus dorsi muscle could impact its function during arm flexation, but more research would be needed to determine exactly how it works in action.