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Titolo:
Timing of activation of the erector spinae and hamstrings during a trunk flexion and extension task
Autore:
McGorry, RW; Hsiang, SM; Fathallah, FA; Clancy, EA;
Indirizzi:
Liberty Mutual Res Ctr Safety & Hlth, Hopkinton, MA 01748 USA Liberty Mutual Res Ctr Safety & Hlth Hopkinton MA USA 01748 MA 01748 USA Texas Tech Univ, Lubbock, TX 79409 USA Texas Tech Univ Lubbock TX USA 79409 xas Tech Univ, Lubbock, TX 79409 USA Univ Calif Davis, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616Univ Calif Davis, Davis, CA 95616 USA Worcester Polytech Inst, Worcester, MA 01609 USA Worcester Polytech Inst Worcester MA USA 01609 t, Worcester, MA 01609 USA
Titolo Testata:
SPINE
fascicolo: 4, volume: 26, anno: 2001,
pagine: 418 - 425
SICI:
0362-2436(20010215)26:4<418:TOAOTE>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-BACK-PAIN; LUMBAR-PELVIC RHYTHM; RELAXATION PHENOMENON; MUSCLE-ACTIVITY; MOTION; COORDINATION; MOVEMENTS; BEHAVIOR; PATTERNS;
Keywords:
coordination; electromyogram; extension; flexion; flexion-relaxation; lumbar;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: McGorry, RW Liberty Mutual Res Ctr Safety & Hlth, 71 Frankland Rd, Hopkinton, MA 01748USA Liberty Mutual Res Ctr Safety & Hlth 71 Frankland Rd Hopkinton MA USA 01748
Citazione:
R.W. McGorry et al., "Timing of activation of the erector spinae and hamstrings during a trunk flexion and extension task", SPINE, 26(4), 2001, pp. 418-425

Abstract

Study Design: Timing of activation of the hamstrings and erector spinae was assessed using surface electromyography. Objectives: To investigate the influence of posture and movement speed during trunk flexion-extension on the flexion-relaxation response and trunk muscle activation patterns. Summary of Background Data: The literature contains numerous reports on coactivity and synergistic behavior of major muscle groups during trunk flexion-extension. There are few reports on the timing of muscle activation. Methods: Six subjects were recruited for a training Session and six biweekly test sessions. Ten surface electromyogram electrodes and a lordosimeter were used to record timing of lumbar motion and muscle recruitment in the hamstrings and at four sites in the thoracolumbar region. A 3 X 2 within-subject factorial design was used to test the effects of posture and speed on activation patterns. Results: Patterns of muscle activation were found to be dependent on posture and the direction of movement. The flexion-relaxation response was pervasive in the lumbar region but was less consistent at the T9 and hamstring sites. Significant differences in the delay between electromyogram activation and lumbar motion were found for the standing postures at initiation of extension, in which activation progressed in the caudad-to-cephalad direction. Conclusions: The flexion-relaxation response is ubiquitous in the lumbar erector spinae and is present in the hamstrings and lower thoracic erector spinae, although not consistently in all subjects. In standing, timing of activation differed significantly by site in extension but not in flexion. Muscle activation patterns and flexion-relaxation were consistent over six biweekly test sessions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 22:11:43