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Titolo:
An electromyographical analysis of the role of dorsiflexors on the gait transition during human locomotion
Autore:
Hreljac, A; Arata, A; Ferber, R; Mercer, JA; Row, BS;
Indirizzi:
Calif State Univ Sacramento, Sacramento, CA 95819 USA Calif State Univ Sacramento Sacramento CA USA 95819 ramento, CA 95819 USA USAF Acad, Dept Kinesiol, Boulder, CO 80840 USA USAF Acad Boulder CO USA 80840 Acad, Dept Kinesiol, Boulder, CO 80840 USA Univ Oregon, Eugene, OR 97403 USA Univ Oregon Eugene OR USA 97403Univ Oregon, Eugene, OR 97403 USA UNLV, Dept Kinesiol, Las Vegas, NV 89109 USA UNLV Las Vegas NV USA 89109UNLV, Dept Kinesiol, Las Vegas, NV 89109 USA Penn State Univ, Ctr Locomot Studies, University Pk, PA 16802 USA Penn State Univ University Pk PA USA 16802 s, University Pk, PA 16802 USA
Titolo Testata:
JOURNAL OF APPLIED BIOMECHANICS
fascicolo: 4, volume: 17, anno: 2001,
pagine: 287 - 296
SICI:
1065-8483(200111)17:4<287:AEAOTR>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
WALK-RUN TRANSITION; TREADMILL WALKING; PERCEIVED EXERTION; ENERGY-COST; SPEED; DETERMINANTS; HABITUATION; FREQUENCY; DYNAMICS; STRIDE;
Keywords:
walking; running; EMG; muscle activation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Hreljac, A Calif State Univ Sacramento, 6000 J St, Sacramento, CA 95819 USA Calif State Univ Sacramento 6000 J St Sacramento CA USA 95819 A
Citazione:
A. Hreljac et al., "An electromyographical analysis of the role of dorsiflexors on the gait transition during human locomotion", J AP BIOMEC, 17(4), 2001, pp. 287-296

Abstract

Previous research has demonstrated that the preferred transition speed during human locomotion is the speed at which critical levels of ankle angularvelocity and acceleration (in the dorsiflexor direction) are reached, leading to the hypothesis that gait transition occurs to alleviate muscular stress on the dorsiflexors. Furthermore, it has been shown that the metabolic cost of running at the preferred transition speed is greater than that of walking at that speed. This increase in energetic cost at gait transition has been hypothesized to occur due to a greater demand being placed on the larger muscles of the lower extremity when gait changes from a walk to a run. This hypothesis was tested by monitoring electromyographic (EMG) activity of the tibialis anterior, medial gastrocnemius, vastus lateralis, biceps femoris, and gluteus maximus while participants (6 M, 3 F) walked at speeds of 70, 80, 90, and 100% of their preferred transition speed, and ran at their preferred transition speed. The EMG activity of the tibialis anterior increased as walking speed increased, then decreased when gait changed to a run at the preferred transition speed. Concurrently, the EMG activity of all other muscles that were monitored increased with increasing walking speed, and at a greater rate when gait changed to a run at the preferred transition speed. The results of this study supported the hypothesis presented.

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Documento generato il 09/04/20 alle ore 20:14:12