Washington: 100 percent muscle power doesn`t come in the way it was believed for the past 50 years, according to scientists.The basics of how a muscle generates power remain the same: Filaments of myosin tugging on filaments of actin shorten, or contract but University of Washington-led research showed that as muscles bulge, the filaments are drawn apart from each other, the myosin tugs at sharper angles over greater distances, and it`s that action that deserves credit for half the change in muscle force scientists have been measuring.C. David Williams, who earned his doctorate at the UW while conducting the research, said that the predominant thinking of the last 50 years is that 100 percent of the muscle force comes from changes as muscles shorten and myosin and actin filaments overlap.He said that when the effects of filament overlap is isolated they only got about half the change in force that physiologists know muscles are capable of producing.The rest of the force, he said, should be credited to the lattice work of filaments as it expands outward in bulging muscle - whether in a body builder`s buff biceps or the calves of a sinewy marathon runner.
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