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Fig. 2. Effect of previous co-activation of excitor and inhibitor axons on the time
to onset of muscle contraction. (A) The apparatus used for force transduction
experiments. (B) Force measurements show that the time to onset of contraction
was reduced when a period of co-activation of the excitor and inhibitor axons
(1.25 s) preceded excitor stimulation alone (grey) compared with excitor
stimulation from rest (black). E (arrow) indicates either the start of
stimulation for the control or the first stimulus after inhibition for the
test condition. The onset of contraction under the two conditions is indicated
by the arrowheads. (C) The excitatory junction potentials (EJPs) produced by
excitor axon stimuli alone (E,top) or by a period of co-activation of the
inhibitor and excitor axons (E+I) followed by the excitor axon alone
(E,bottom). (D) Data pooled from several experiments where EJP amplitude
(normalized to the first EJP) is plotted versus stimulus number (mean
± S.E.M.; control, filled circles;
with preceeding inhibition, open circles). After the period of co-activation
of both axons (arrow), the amplitude of the first EJP is significantly larger
than the previous, inhibited EJP (paired t-test, P<0.001,
N=6 preparations).
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