Fig. 6. Recruitment between fast and slow motor units in the medial gastrocnemius of the cat. Intensities were summed from wavelet domains 3 and 4 to represent slow motor unit activity (red columns, band-width 50–110 Hz) and from wavelet domains 7 and 8 to represent fast motor unit activity (blue columns, band-width 190–300 Hz). The maximum intensity was measured for separate strides and paw-shakes for the cat shown in Fig. 5. Values are means + S.E.M. (N=10) of these maximum intensities. Values are shown for each of the four movements.