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Titolo:
Bilateral deficit of voluntary quadriceps muscle activation after unilateral ACL tear
Autore:
Urbach, D; Nebelung, W; Weiler, HT; Awiszus, F;
Indirizzi:
Otto Von Guericke Univ, Neuromuscular Res Grp, Dept Orthoped, D-39120 Magdeburg, Germany Otto Von Guericke Univ Magdeburg Germany D-39120 9120 Magdeburg, Germany
Titolo Testata:
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
fascicolo: 12, volume: 31, anno: 1999,
pagine: 1691 - 1696
SICI:
0195-9131(199912)31:12<1691:BDOVQM>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTERIOR CRUCIATE LIGAMENT; TWITCH-INTERPOLATION TECHNIQUE; TONIC DESCENDING INHIBITION; ELECTRICAL-STIMULATION; REFLEX INHIBITION; KNEE-JOINT; FOLLOW-UP; ACUTE ARTHRITIS; SPINAL NEURONS; RECONSTRUCTION;
Keywords:
twitch interpolation; arthrogenous muscle inhibition; voluntary isometric contraction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Urbach, D Univ Magdeburg, Orthopad Klin, Leipziger Str 44, D-39120 Magdeburg, Germany Univ Magdeburg Leipziger Str 44 Magdeburg Germany D-39120 rmany
Citazione:
D. Urbach et al., "Bilateral deficit of voluntary quadriceps muscle activation after unilateral ACL tear", MED SCI SPT, 31(12), 1999, pp. 1691-1696

Abstract

Purpose: The inability to fully activate the quadriceps femoris muscle voluntarily is known to accompany several different knee-joint pathologies. The extent of a voluntary-activation deficit in patients after isolated rupture of the anterior cruciate ligament (ACL), however, has been reported to be small or nonexistent, making it questionable if a voluntary-activation deficit is a relevant factor for these patients at all. Methods: In this study the ability to voluntarily activate the quadriceps femoris muscles was quantified in 22 male patients with arthroscopically-proven isolated ACL ruptures using an established highly sensitive twitch-interpolation technique. Furthermore, the maximal voluntary contraction force of the quadriceps muscle was obtained by isometric knee-joint torque measurements. The results were compared with an age-, gender-, and activity-matched control group. Results: There was a moderate but significant mean reduction in maximal voluntary activation (VA) in both the injured (VA: 83.9 +/- 2.3%, mean +/- SEM) and uninjured side (VA: 84.7 +/- 2.2%) in comparison with controls (VA: 91.1 /- 0.8%). However, of the patients the 23% who presented a considerably reduced voluntary-activation of less than 80% were mainly responsible for thesignificant mean deficit. Conclusions: The deficit of isometric muscle strength on the injured side compared with that of controls was explained by the voluntary-activation deficit and a true muscle weakness. On the other hand, the diminished muscle strength of the uninjured side was explained sufficiently by the voluntary-activation deficit alone. Considering the bilateral voluntary-activation deficit, functional muscle tests might not be validwhen the uninjured extremity serves as reference.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 15:59:05