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First published online May 30, 2008
Journal of Experimental Biology 211, 1893-1902 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.014415
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Motor unit recruitment patterns 2: the influence of myoelectric intensity and muscle fascicle strain rate

Emma F. Hodson-Tole1,* and James M. Wakeling2

1 The Structure and Motion Laboratory, The Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Herts, AL9 7TA, UK
2 School of Kinesiology, Simon Fraser University, Burnaby, BC, V5A 1S6, Canada


Figure 1
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  		Fig. 1. (A) An example of a three harmonic Fourier series (red line) fitted to soleus sonomicrometry data (blue dots). (Data from subject 12, 0° 20 cm s–1, N=61 strides). (B) Example of four steps of sonomicrometry data from the same subject as A. Each step is denoted by a different colour.

 

Figure 2
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  		Fig. 2. Mean myoelectric intensity spectra for the plantaris muscle (10° 40 cm s–1) illustrating the partitioning of the stride into 20 equal time windows. The division between stance swing phase is shown by the thick vertical grey line, arrows indicate the division between initial stance (St 1), late stance (St 2), initial swing (Sw 1) and late swing (Sw 2) phases. Data are shown as mean (black line) ± s.e.m. (grey lines).

 

Figure 3
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  		Fig. 3. The association between myoelectric intensity and {theta} during each stride phase; data are from the soleus (red diamonds), plantaris (green triangles) and medial gastrocnemius (blue stars) muscles. Points are taken from all locomotor conditions. Where a significant association was identified between {theta} and myoelectric intensity the model II linear regression line has been included (see text for details).

 

Figure 4
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  		Fig. 4. The association between muscle fascicle strain rate and {theta} during each stride phase; data are from the soleus (red diamonds), plantaris (green triangles) and medial gastrocnemius (blue stars) muscles. Points are taken from all locomotor conditions. Where a significant association was identified between {theta} and muscle fascicle strain rate the model II linear regression line has been included (see text for details).

 

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© The Company of Biologists Ltd 2008