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Fig. 2. Typical experiment, conducted with one fibre. (A–C) Two isometric force traces with the fibre at the initial length (i, bottom trace), and the final length (f, middle trace), as well as the stretch contraction from the initial to the final fibre length (s, top trace). In A, the final length corresponds to the optimal length for force development; i.e. at this length, the purely isometric force was maximal. Note that the steady-state force enhancement is greater than any of the isometric forces, although only by a small amount in C. Initial lengths: –10%, –15% and –20% for A, B and C, respectively. Stretch speed was 40% of fibre length s–1, and stretch amplitude was 10% of fibre length in all cases.





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