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Titolo:
Catchlike-inducing train activation of human muscle during isotonic contractions: burst modulation
Autore:
Lee, SCK; Becker, CN; Binder-Macleod, SA;
Indirizzi:
Univ Delaware, Dept Phys Therapy, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 Dept Phys Therapy, Newark, DE 19716 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 5, volume: 87, anno: 1999,
pagine: 1758 - 1767
SICI:
8750-7587(199911)87:5<1758:CTAOHM>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN SKELETAL-MUSCLE; MEDIAL GASTROCNEMIUS-MUSCLE; SINGLE MOTOR UNITS; STIMULATED CONTRACTIONS; EXCITATION-FREQUENCY; CALCIUM TRANSIENTS; SOLEUS MUSCLE; FORCE OUTPUT; POWER OUTPUT; FROG-MUSCLE;
Keywords:
human quadriceps femoris muscle; catchlike property; isotonic; fatigue; functional electrical stimulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Binder-Macleod, SA Univ Delaware, Dept Phys Therapy, 303 McKinly Lab, Newark, DE 19716 USA Univ Delaware 303 McKinly Lab Newark DE USA 19716 6 USA
Citazione:
S.C.K. Lee et al., "Catchlike-inducing train activation of human muscle during isotonic contractions: burst modulation", J APP PHYSL, 87(5), 1999, pp. 1758-1767

Abstract

Stimulation trains that exploit the catchlike property [catchlike-inducingtrains (CITs)] produce greater forces and rates of rise of force than do constant-frequency trains (CFTs) during isometric contractions and isovelocity movements. This study examined the effect of CITs during isotonic contractions in healthy subjects. Knee extension was electrically elicited against a load of 10% of maximum voluntary isometric contraction. The stimulationintensity was set to produce 20% of maximum voluntary isometric contraction. The muscle was tested before and after fatigue with a 6-pulse CFT and 6-pulse CITs that contained an initial doublet, triplet, or quadruplet. For prefatigue responses, the greatest isotonic performance was produced by CITswith initial doublets. When the muscles were fatigued, triplet CITs were best. CITs produce greater excursion, work, peak power, and average power than do CFTs, because CITs produced more rapid rates of rise of force. Fasterrates of rise of force enabled the preload on the muscle to be exceeded earlier during the stimulation train.

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Documento generato il 06/04/20 alle ore 04:47:30