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Fig. 12. The effect of varying stimulus phase or duration during in vitro
crawling cycles. (A) Varying the timing of the 0.68 s stimulus by as little as
0.2 s, about 10% of the strain cycle duration, resulted in no positive work
being done by the same muscle preparation as in Figs
2 and
11. (B) Varying stimulus
duration from 0.28 to 1.08 s for a 3.6 mm VIL while holding the timing of the
stimulus midpoint at the same value as in A and in
Fig. 11 resulted in positive
work being done for a portion of the strain cycle in both cases, as well as
for intermediate stimulus duration values (not shown).
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