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Titolo:
MODULATION OF SHORT-LATENCY STRETCH REFLEXES DURING HUMAN HOPPING
Autore:
VOIGT M; DYHREPOULSEN P; SIMONSEN EB;
Indirizzi:
UNIV AALBORG,CTR SENSORY MOTOR INTERACT,FREDRIK BAJERS VEJ 7,BLDG D3 DK-9220 AALBORG O DENMARK UNIV COPENHAGEN,SECT NEUROPHYSIOL,DEPT MED PHYSIOL COPENHAGEN DENMARK UNIV COPENHAGEN,DEPT MED ANAT C COPENHAGEN DENMARK
Titolo Testata:
Acta Physiologica Scandinavica
fascicolo: 2, volume: 163, anno: 1998,
pagine: 181 - 194
SICI:
0001-6772(1998)163:2<181:MOSSRD>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLEUS MUSCLE; HUMAN ANKLE; H REFLEX; WALKING; MOVEMENTS; TENDON; EFFICIENCY; LENGTH; MOMENT; CAT;
Keywords:
H-REFLEX; HUMAN HOPPING; MEDIAL GASTROCNEMIUS; MUSCLE SPINDLE STRETCH VELOCITY; SHORT LATENCY STRETCH REFLEX; SOLEUS; TENDON COMPLIANCE; TENDON MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
M. Voigt et al., "MODULATION OF SHORT-LATENCY STRETCH REFLEXES DURING HUMAN HOPPING", Acta Physiologica Scandinavica, 163(2), 1998, pp. 181-194

Abstract

To gain insight into central and peripheral reflex control mechanismsin moving humans we have investigated short latency stretch reflex activity in m. triceps surae during two legged hopping. The objectives were: ii) to compare movement induced short latency stretch reflexes insoleus and medial gastrocnemius (MG) muscles, (2) to determine the relationship between the size of these reflexes and the muscle spindle stretch velocities, and (3) to compare the size of the movement inducedshort latency stretch reflexes and the H-reflexes simultaneously. Sixwell-trained healthy male subjects participated and they hopped at three different work rates. Surface electromyogram (EMG) and H-reflexes were recorded during hopping. Muscle spindle length changes were estimated as the difference between estimated origin-to-insertion length changes and tendon length changes. The important findings were that during hopping: iii movement induced short latency stretch reflexes were observed consistently in soleus, (2) the EMG amplitude of this stretch reflex was negatively correlated with the estimated peak muscle spindle stretch velocity (r(s) = -0.52, P < 0.02), and (3) the amplitude of the soleus H-reflex at touchdown did not change in parallel with the stretch reflex. The negative correlation observed between the stretch reflex and the estimated peak muscle spindle stretch velocity in soleusis opposite to the basic velocity sensitive behaviour of stretch reflexes mechanically elicited during resting conditions. Possible controlmechanisms are discussed. Additionally, muscle spindle length changesestimated from changes in the skeletal movements (joint angles) should be inferred cautiously because of tendon compliance, especially at high tendon forces.

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Documento generato il 27/01/21 alle ore 01:37:00