<P> The sliding filament theory was born from two consecutive papers published on the 22 May 1954 issue of Nature under the common theme "Structural Changes in Muscle During Contraction". Though their conclusions were fundamentally similar, their underlying experimental data and propositions were different . </P> <P> The first paper, written by Andrew Huxley and Rolf Niedergerke, is titled "Interference microscopy of living muscle fibres". It was based on their study of frog muscle using interference microscope, which Andrew Huxley developed for the purpose . According to them: </P> <Ol> <Li> the I bands are composed of actin filaments, and the A bands principally of myosin filaments; and </Li> <Li> during contraction, the actin filaments move into the A bands between the myosin filaments . </Li> </Ol> <Li> the I bands are composed of actin filaments, and the A bands principally of myosin filaments; and </Li>

Sliding filament theory of muscle contraction in hindi