Document Type




Format of Original

6 p.

Publication Date



Informa Healthcare

Source Publication

Somatosensory & Motor Research

Source ISSN


Original Item ID

doi: 10.3109/08990220.2012.662184


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:


Accepted version. Somatosensory & Motor Research, Vol. 29, No. 1 (2012): 38-43. DOI: 10.3109/08990220.2012.662184. © 2012 Informa Healthcare. Used with permission.

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