Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task.

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Abstract Text:

J Michel,H J A van Hedel,V Dietz,

The aim of this study was to investigate spinal reflex (SR) modulation during the performance and learning of a precision locomotor task. Healthy subjects had to minimize foot clearance when repeatedly stepping on a treadmill over a randomly approaching obstacle. The subjects walked with reduced vision and were informed about the approaching obstacle and task performance by acoustic warning and feedback signals, respectively. SRs were randomly evoked by tibial nerve stimulation (with non-nociceptive and nociceptive stimulus intensity) during the mid-stance phase in both normal and pre-obstacle stepping. Foot clearance and electromyographic activity of the tibialis anterior and biceps femoris muscles of the right leg were analysed. Only if a delay was introduced between warning signal and nerve stimulation, was the SR amplitude in both muscles enhanced prior to obstacle steps compared with normal steps for both stimulus intensities. Thus, the reflex enhancement depended on the subject's awareness of the approaching obstacle. Improved performance was reflected in a decreased foot clearance, but did not correlate with the course of SR amplitude. It is concluded that obstacle stepping is associated with a facilitation of SR pathways, probably by supraspinal drive. This facilitation might provide assistance in safe obstacle stepping, e.g. to compensate quickly if resistance is encountered.

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Publishing Authors By Initials

J Michel,HJ van Hedel,V Dietz,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

PUBMED ID PMID:

MEDLINE DATE:

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The European journal of neuroscience

VOLUME: 26

Page Numbers: 1299-306

Journal Abbreviation: Eur. J. Neurosci.

ISSN: 0953-816X

DAY: 28

MONTH: Sep

YEAR: 2007

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8918110

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: physiology

Chemical & Substance for Abstract: Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task.

AFFILIATION: Spinal Cord Injury Center, Balgrist University Hospital, Forchstrasse 340, CH-8008 Zurich, Switzerland. jmichel@paralab.balgrist.ch

Country: France

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Eur J Neurosci

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task Related Publications

• Activity, inactivity, and screen time in relation to weight and fatness over adolescence in girls.
• Biochemical and molecular characterization of the mitochondrial peroxiredoxin PsPrxII F from Pisum sativum.
• Bronchography in the severely discharging lung.
• Chemical composition of normal bone marrow.
• Childhood overweight and family income.
• Cost Effectiveness of Lopinavir/Ritonavir Tablets Compared with Atazanavir plus Ritonavir in Antiretroviral-Experienced Patients in the UK, France, Italy and Spain.
• Extracellular microfibrils in development and disease.
• Facilitation of spinal reflexes assists performing but not learning an obstacle-avoidance locomotor task.
• Fibrillin-rich microfibrils: Structural determinants of morphogenetic and homeostatic events.
• Gauging possibilities for action based on friction underfoot.
• Gestational age estimates from singleton births conceived using assisted reproductive technology.
• High altitude web.
• Immediate effect of Ayres's sensory integration-based occupational therapy intervention on children with autism spectrum disorders.
• Levator co-activation is a significant confounder of pelvic organ descent on Valsalva maneuver.
• Levator trauma in labor: a challenge for obstetricians, surgeons and sonologists.
• Long-segment hypoplasia of the left hemicolon 4 months after sigmoid resection and loop transversostomy in a patient with intestinal endometriosis.
• OC255: Female pelvic organ prolapse and levator trauma.
• OC256: Imaging of the Perigee transobturator mesh and its effect on stress incontinence.
• OC259: A comparison of magnetic resonance imaging and 4D ultrasound in the assessment of the levator hiatus.
• OC260: Ballooning: how to define abnormal distensibility of the levator hiatus.
• Quantification of major morphological abnormalities of the levator ani.
• Reply.
• Salvage surgery after failed chemoradiation for anal canal cancer: should the paradigm be changed for high-risk tumors?
• Single joint perturbation during gait: preserved compensatory response pattern in spinal cord injured subjects.
• Synthesis of N,N-bis(3-butenyl)amines from 2-azaallyl dication synthetic equivalents and conversion to 2,3,6,7-tetrahydroazepines by ring-closing metathesis.
• Tetraalkylphosphonium polyoxometalate ionic liquids: novel, organic-inorganic hybrid materials.
• Tetraalkylphosphonium polyoxometalates: electroactive, "task-specific" ionic liquids.
• The dual function of plant peroxiredoxins in antioxidant defence and redox signaling.
• The hook test for distal biceps tendon avulsion.
• [Elastic stable intramedullary nailing (ESIN) of supracondylar fractures of the humerus in children]