Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
TASK-DEPENDENT MODULATION OF SHORT-LATENCY AND LONG-LATENCY ELECTROMYOGRAPHIC RESPONSES IN UPPER-LIMB MUSCLES
Autore:
DIETZ V; DISCHER M; TRIPPEL M;
Indirizzi:
PARALEG CTR,BALGRIST FORCHSTR 340 CH-8008 ZURICH SWITZERLAND UNIV FREIBURG,DEPT CLIN NEUROL & NEUROPHYSIOL W-7800 FREIBURG GERMANY
Titolo Testata:
Electroencephalography and clinical neurophysiology
fascicolo: 1, volume: 93, anno: 1994,
pagine: 49 - 56
SICI:
0013-4694(1994)93:1<49:TMOSAL>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLEUS-H-REFLEX; STRETCH REFLEX; MOVEMENT TASKS; BICEPS-BRACHII; FORCE TASKS; HUMAN WRIST; MOTOR; COORDINATION; STANCE; CORTEX;
Keywords:
UPPER LIMB MUSCLE EMG; SHORT-LATENCY REFLEXES; LONG-LATENCY REFLEXES; SINUSOIDAL MOVEMENTS; CONTROL OF TORQUE; CONTROL OF POSITION; TASK-DEPENDENT MODULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
V. Dietz et al., "TASK-DEPENDENT MODULATION OF SHORT-LATENCY AND LONG-LATENCY ELECTROMYOGRAPHIC RESPONSES IN UPPER-LIMB MUSCLES", Electroencephalography and clinical neurophysiology, 93(1), 1994, pp. 49-56

Abstract

Records were made of electromyographic (EMG) responses of both upper limb muscles and the corresponding elbow joint movements following sinusoidal (0.3 Hz) isometric displacement of the elbow joint itself. Twomotor conditions were tested. Firstly, the subjects had to control elbow position and secondly control joint torque. Randomly timed, flexing or extending ramp impulses were induced at different displacement velocities and amplitudes. Following long duration displacements (>100 msec) the recorded EMG responses could clearly be separated into 3 different components (M1-M3). The M1 component was of constant duration but M3 corresponded to the duration of the ramp displacement. It is proposed that the M1 component is ''coded'' by the acceleration signal andthe M3 component by the velocity signal. Only the shape of the M2 component was dependent upon the actual motor condition. With the subjects controlling the elbow joint angle the M2 components in the arm flexor and extensor EMG responses exhibited a peak whose rate of rise was dependent on displacement velocity. However, when elbow torque was controlled by the subjects the M2 component exhibited a plateau whose amplitude was dependent on displacement velocity. The amplitude of the M2 component was significantly larger during position-control than duringtorque-control. We propose that the difference in the behaviour of the EMG responses may be achieved by the appropriate central regulation of gamma-motoneurone activity or, alternatively, by selective modulation of different receptor inputs between the two tasks.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/01/21 alle ore 02:48:20