PMID- 26289484
OWN - NLM
STAT- MEDLINE
DCOM- 20160906
LR  - 20181113
IS  - 1432-1106 (Electronic)
IS  - 0014-4819 (Linking)
VI  - 233
IP  - 12
DP  - 2015 Dec
TI  - Effects of postural and voluntary muscle contraction on modulation of the soleus 
      H reflex by transcranial magnetic stimulation.
PG  - 3425-31
LID - 10.1007/s00221-015-4417-3 [doi]
AB  - Modulation of spinal reflexes depends largely on the integrity of the 
      corticospinal tract. A useful method to document the influence of descending 
      tracts on reflexes is to examine the effects of transcranial magnetic stimulation 
      (TMS) on the soleus H reflex elicited by posterior tibial nerve electrical 
      stimuli (PTS). In 12 healthy volunteers, we investigated how postural or 
      voluntary muscle contraction modified such descending modulation. We first 
      characterized the effects of TMS at 95 % of motor threshold for leg responses on 
      the H reflex elicited by a preceding PTS at inter-stimuli intervals (ISIs) 
      between 0 and 120 ms at rest and, then, during voluntary plantar flexion (pf), 
      dorsal flexion (df), and standing still (ss). During pf, there was an increase in 
      the facilitation of the H reflex at ISIs 0-20 ms. During df, there were no 
      effects of TMS on the H reflex. During ss, there was inhibition at ISIs 40-60 ms. 
      Our observations suggest that muscle contraction prevails over the baseline 
      effects of TMS on the soleus H reflex. While contraction of the antagonist (df) 
      suppressed most of the effects, contraction of the agonist had different effects 
      depending on the type of activity (pf or ss). The characterization of the 
      interaction between descending corticospinal volleys and segmental peripheral 
      inputs provides useful information on motor control for physiological research 
      and further understanding of the effects of spinal cord lesions.
FAU - Guzman-Lopez, Jessica
AU  - Guzman-Lopez J
AD  - EMG and Motor Control Unit, Neurology Department, Hospital Clinic, Universitat de 
      Barcelona, Barcelona, Spain. J.Guzmanlopez@westminster.ac.uk.
AD  - Department of Psychology, Faculty of Science and Technology, University of 
      Westminster, London, W1W 6UW, UK. J.Guzmanlopez@westminster.ac.uk.
FAU - Selvi, Aikaterini
AU  - Selvi A
AD  - EMG and Motor Control Unit, Neurology Department, Hospital Clinic, Universitat de 
      Barcelona, Barcelona, Spain.
FAU - Sola-Valls, Nuria
AU  - Sola-Valls N
AD  - EMG and Motor Control Unit, Neurology Department, Hospital Clinic, Universitat de 
      Barcelona, Barcelona, Spain.
FAU - Casanova-Molla, Jordi
AU  - Casanova-Molla J
AD  - EMG and Motor Control Unit, Neurology Department, Hospital Clinic, Universitat de 
      Barcelona, Barcelona, Spain.
FAU - Valls-Sole, Josep
AU  - Valls-Sole J
AD  - EMG and Motor Control Unit, Neurology Department, Hospital Clinic, Universitat de 
      Barcelona, Barcelona, Spain.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20150820
PL  - Germany
TA  - Exp Brain Res
JT  - Experimental brain research
JID - 0043312
SB  - IM
MH  - Adult
MH  - Electromyography
MH  - Female
MH  - H-Reflex/*physiology
MH  - Humans
MH  - Male
MH  - Motor Activity/*physiology
MH  - Muscle Contraction/*physiology
MH  - Muscle, Skeletal/*physiology
MH  - Posture/*physiology
MH  - Pyramidal Tracts/*physiology
MH  - Tibial Nerve/physiology
MH  - *Transcranial Magnetic Stimulation
MH  - Young Adult
OTO - NOTNLM
OT  - Brain plasticity
OT  - H reflex
OT  - Motor reorganization
OT  - Propriospinal reflexes
OT  - Transcranial magnetic stimulation (TMS)
EDAT- 2015/08/21 06:00
MHDA- 2016/09/07 06:00
CRDT- 2015/08/21 06:00
PHST- 2015/03/11 00:00 [received]
PHST- 2015/08/11 00:00 [accepted]
PHST- 2015/08/21 06:00 [entrez]
PHST- 2015/08/21 06:00 [pubmed]
PHST- 2016/09/07 06:00 [medline]
AID - 10.1007/s00221-015-4417-3 [pii]
AID - 10.1007/s00221-015-4417-3 [doi]
PST - ppublish
SO  - Exp Brain Res. 2015 Dec;233(12):3425-31. doi: 10.1007/s00221-015-4417-3. Epub 
      2015 Aug 20.