NDLI: Changes in the gain of the soleus H-reflex with changes in the motor recruitment level and/or movement speed

Content Provider	Springer Nature Link
Author	Larsen, Birgit Voigt, Michael
Copyright Year	2004
Abstract	The behaviour of the soleus H-reflex is considered to be motor task-dependent. However, the speed of movements as well as the motor recruitment level is altered when motor tasks are changed. Therefore it is ambiguous to what extent the motor task-dependent changes found between walking and running, for example, are simply due to changes in these two parameters. The purpose of this study was to investigate how movement speed and motor recruitment level separately influence the soleus H-reflex behaviour when the motor task is unchanged. Soleus H-reflexes were elicited during pedalling at different cadences and crank loads, by which movement speed and muscle recruitment level were modified separately. The H-reflex gain was expressed as the slope of the linear relation between the reflex amplitudes and the background electromyelogram (EMG), and the reflex threshold was expressed by the intercept. The results showed a decrease in reflex gain by 54% ( P =0.001) when the speed of movement was doubled from 40 to 80 rpm (repetitions per minute) without changes in the level of soleus EMG activity. Reflex gain decreased 40% ( P =0.002) when the soleus EMG level was increased by 47% without changing the speed of movement. No significant changes were found in the reflex threshold. We conclude that as speed of movement and motor recruitment level influence the gain of the soleus H-reflex, it is significant that these two parameters are comparable before changes in H-reflexes are stated to be task-dependent.
Starting Page	19
Ending Page	29
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	93
Issue Number	1
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-08-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Locomotion Pedalling Reflex modulation Soleus
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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