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Fig. 2. Mechanical responses of the ABRM fibres to quick increases in load. The
load on the preparation increased from P0 to P
(
2.3P0) in A, and from Px
(
0.5P0) to P
(
4.5Px) during the catch state in B. In this and the
subsequent figures, the upper and lower traces show length and force changes,
respectively. Bottom broken lines represent zero force level. Records A and B
were obtained from the same preparation. Inset illustrates the three phases
(13) of the mechanical response as well as the method to determine the
amplitude of the early isotonic lengthening
L. SEC, series
elastic component.