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Fig. 2. Example of raw data for stress against time (A) and length against time (B)
for one set of three contractions with a shortening distance equal to 100% of
stretch distance. Lopt=optimal length.
Isometric-shortening contraction–thick, solid, light-grey line; purely
isometric contraction–thick, broken, dark-grey line; stretch-shortening
contraction–thin, solid, black line. Force is transiently negative after
shortening because of damped oscillations, which may have been caused by
vibrations in the wire hook attached to the force transducer. Vertical broken
lines indicate the period over which mean force was calculated before the
stiffness test. Inset shows expansion of force records between broken lines,
with double-headed arrows indicating the force enhancement calculated by two
different methods (rFE1,rFE2) and the force depression (FD).
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