A, maximum developed force; B, maximum contraction rate (maximum dF/dt of first contraction in stimulation train; C, maximum relaxation rate (minimum -dF/dt of last contraction in stimulation train; D, relaxation time from 95 to 50 % of maximum force; and E, relaxation time from 50 to 5 % of maximum force at various time points during the 1 h stimulation period. Data are mean values ±s.e.m. Asterisk indicates value significantly different from Sham at a given time point. Time-dependent significance not shown (see text).