Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Bilateral interactions during contractions of intrinsic hand muscles
Autore:
Zijdewind, I; Kernell, D;
Indirizzi:
Univ Groningen, Dept Med Physiol, NL-9700 AD Groningen, Netherlands Univ Groningen Groningen Netherlands NL-9700 AD D Groningen, Netherlands
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 5, volume: 85, anno: 2001,
pagine: 1907 - 1913
SICI:
0022-3077(200105)85:5<1907:BIDCOI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSCRANIAL MAGNETIC STIMULATION; MOTOR-EVOKED-POTENTIALS; VOLUNTARY CONTRACTION; CORTICAL EXCITABILITY; FINGER MOVEMENTS; IPSILATERAL HAND; ELBOW FLEXORS; HUMAN-BRAIN; ACTIVATION; CORTEX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Zijdewind, I Univ Groningen, Dept Med Physiol, A Deusinglaan 1,POB 196, NL-9700 AD Groningen, Netherlands Univ Groningen A Deusinglaan 1,POB 196 Groningen Netherlands NL-9700 AD
Citazione:
I. Zijdewind e D. Kernell, "Bilateral interactions during contractions of intrinsic hand muscles", J NEUROPHYS, 85(5), 2001, pp. 1907-1913

Abstract

During demanding voluntary contractions (e.g., high force or fatigue), activation is not restricted to the target muscle but extends to other ipsilateral muscles; even contralateral muscles become activated. The contralateral "irradiation" of activity was measured in five subjects during submaximaland maximal voluntary contractions (MVCs) of the first dorsal interosseous(FDI) (index finger abduction) and during unfatigued and fatigued conditions. All subjects were tested five times with at least one week between tests. Unilateral MVCs were associated with a substantial amount of contralateral FDI activation [mean = 7.9 +/- 6.7% (SD) MVC prior to fatigue]. The amount of such contralateral irradiation was significantly different between different individuals and was positively correlated between dominant and nondominant hands. During fatigue tests, the contractile activity of the contralateral "nontarget" index finger showed progressive increase (force, electromyogram) as was measured during both the submaximal task and interspersed MVCs of the target finger. In addition, a superimposed saw-tooth pattern ofintermittently waxing and waning contractions commonly appeared contralaterally. The expression of contralateral irradiation force was itself fatigue-sensitive: less irradiation was seen in a recently fatigued muscle than was seen before the fatigue test. These fatigue effects could not be explained as having been caused by changes in muscle properties. Possible anatomical sites of contralateral irradiation are briefly discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 15:25:08