Fig. 3. Analysis of locomotor muscle activity (EMGs). Distribution histograms of the slopes for (A) BP1-BP5 and (B) 23, 34 and 15 versus cycle time (see Fig. 1B) (N=7-39 animals; see Table 1, left). The slopes of these parameters of locomotor activity versus cycle time were, to a first approximation, normally distributed, which validated use of the Sign test to determine if the composite mean slopes were significantly different from zero (see Materials and methods).