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- W2110453007 abstract "SUMMARY Motor units are generally considered to follow a set, orderly pattern of recruitment within each muscle with activation occurring in the slowest through to the fastest units. A growing body of evidence, however, suggests that recruitment patterns may not always follow such an orderly sequence. Here we investigate whether motor unit recruitment patterns vary within and between the ankle extensor muscles of the rat running at 40 cm s-1 on a level treadmill. In the past it has been difficult to quantify motor unit recruitment patterns during locomotion; however, recent application of wavelet analysis techniques has made such detailed analysis of motor unit recruitment possible. Here we present methods for quantifying the interplay of fast and slow motor unit recruitment based on their myoelectric signals. Myoelectric data were collected from soleus, plantaris and medial gastrocnemius muscles representing populations of slow, mixed and fast fibres, respectively, and providing a good opportunity to relate myoelectric frequency content to motor unit recruitment patterns. Following wavelet transformation, principal component analysis quantified signal intensity and relative frequency content. Significant differences in signal frequency content occurred between different time points within a stride (P<0.001). We optimised high- and low-frequency wavelets to the major signals from the fast and slow motor units. The goodness-of-fit of the optimised wavelets to the signal intensity was high for all three muscles (r2>0.98). The low-frequency band had a significantly better fit to signals from the soleus muscle (P<0.001), while the high-frequency band had a significantly better fit to the medial gastrocnemius(P<0.001)." @default.
- W2110453007 created "2016-06-24" @default.
- W2110453007 creator A5050165298 @default.
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- W2110453007 date "2007-07-01" @default.
- W2110453007 modified "2023-09-25" @default.
- W2110453007 title "Variations in motor unit recruitment patterns occur within and between muscles in the running rat (<i>Rattus norvegicus</i>)" @default.
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- W2110453007 doi "https://doi.org/10.1242/jeb.004457" @default.
- W2110453007 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17575038" @default.
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