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Fig. 6. Efficiency of muscle work measured over 10 contractions, derived from work
and oxygen consumption as described in Materials and methods. `I', shortening
contractions preceded by an isometric phase; `S', shortening contractions
preceded by a stretch; `net', calculations using the net work done during the
entire contraction; `shorten', calculations using the work done during only
the shortening portion of the contraction, but still the energy used during
the entire contraction. Values are means ± s.e.m. P values
compare the two measurements that they straddle.