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Fig. 4. Representative strain, total stress and power when muscles 178 and 179
operated under identical strain and stimulation conditions. The shaded area
represents the shortening phase of the oscillatory cycle. The stimulation
pattern, represented on the graphs by the yellow squares, was determined
during running at the animal's preferred speed (3 pulses at 100 Hz)
(Full et al., 1998;
Ahn and Full, 2002). (A) The
strain pattern was identical for both muscles (15% strain amplitude). (B)
Muscle stress during imposed running conditions. The shaded areas represent
the shortening (or stance) phase of the oscillatory cycle. (C) Work loops for
muscles 178 and 179 under identical conditions. Work loops show muscle 178
generated net mechanical power during the cycle, while muscle 179 absorbed net
mechanical power under identical conditions. Arrows indicate the direction of
the loops.
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