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Fig. 5. Cumulative metabolic cost over 10 contractions, derived from oxygen
consumption as described in Materials and methods. `I', shortening
contractions preceded by an isometric phase; `S', shortening contractions
preceded by a stretch; `Isometric', cost of a 100 ms isometric contraction;
`Stretch', cost of a 25 ms stretch followed by 75 ms isometric contraction.
Cost is expressed relative to muscle mass. Values are means ± s.e.m.
P values compare the measurements that they straddle using values
uncorrected for muscle mass.