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Fig. 4. Cumulative work done during 10 contractions in the protocols described in
the Materials and methods and in Fig.
3. `I', shortening contractions preceded by an isometric phase;
`S', shortening contractions preceded by a stretch; `shorten', the work done
during the shortening portion of the contraction; `net', the net work done
during the entire contraction (note: for contractions preceded by an isometric
phase, net work equals shortening work); `stretch', the work required to
stretch the muscle. Work is expressed relative to muscle mass. Values are
means ± s.e.m. P values are comparisons with I-shorten using
work values uncorrected for muscle mass.
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