Effects of homosynaptic depression on spectral properties of H-reflex recordings. Somatosens Mot Res 2012;29(1):38-43
Date
03/16/2012Pubmed ID
22416782DOI
10.3109/08990220.2012.662184Scopus ID
2-s2.0-84859708305 (requires institutional sign-in at Scopus site) 2 CitationsAbstract
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.
Author List
Kipp K, Johnson ST, Hoffman MAAuthor
Kristof Kipp BS,MS,PhD Assistant Professor in the Physical Therapy department at Marquette UniversityMESH terms used to index this publication - Major topics in bold
AdultBiophysics
Electric Stimulation
Electromyography
Female
H-Reflex
Humans
Long-Term Synaptic Depression
Male
Muscle Contraction
Recruitment, Neurophysiological
Spectrum Analysis
Statistics, Nonparametric
Time Factors
Young Adult
