Effects of Homosynaptic Depression on Spectral Properties of H-Reflex Recordings
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Somatosensory & Motor Research
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The purpose of this study was to determine the effects of homosynaptic depression (HD) on spectral properties of the soleus (SOL) H-reflex. Paired stimulations, separated by 100 ms, were used to elicit an unconditioned and conditioned H-reflex in the SOL muscle of 20 participants during quiet standing. Wavelet and principal component analyses were used to analyze features of the time-varying spectral properties of the unconditioned and conditioned H-reflex. The effects of HD on spectral properties of the H-reflex signal were quantified by comparing extracted principal component scores. The analysis extracted two principal components: one associated with the intensity of the spectra and one associated with its frequency. The scores for both principal components were smaller for the conditioned H-reflex. HD decreases the spectral intensity and changes the spectral frequency of H-reflexes. These results suggest that HD changes the recruitment pattern of the motor units evoked during H-reflex stimulations, in that it not only decreases the intensity, but also changes the types of motor units that contribute to the H-reflex signal. Read More: http://informahealthcare.com/doi/abs/10.3109/08990220.2012.662184
Kipp, Kristof; Johnson, Samuel T.; and Hoffman, Mark A., "Effects of Homosynaptic Depression on Spectral Properties of H-Reflex Recordings" (2012). Exercise Science Faculty Research and Publications. 45.