Maximum voluntary activation in nonfatigued and fatigued muscle of young and elderly individuals.
BACKGROUND AND PURPOSE: Researchers studying central activation of muscles in elderly subjects (> or = 65 years of age) have investigated activation in only the nonfatigued state. This study examined the ability of young and elderly people to activate their quadriceps femoris muscles voluntarily und...
| Publicado en: | Physical Therapy Vol. 81; no. 5; pp. 1102 - 1110 |
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| Autores principales: | , , , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Oxford University Press / USA
May2001
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=107037691&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 107037691 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00319023 PTH jtl: Physical Therapy issn: 00319023 maglogo: N pubinfo: dt: May2001 vid: 81 iid: 5 pid: 10398 pub: Oxford University Press / USA artinfo: ui: 107037691 2001063273 10.1093/ptj/81.5.1102 NLM11319935 107037691 ppf: 1102 ppct: 8 formats: fmt: – @attributes: type: T – @attributes: type: P tig: atl: Maximum voluntary activation in nonfatigued and fatigued muscle of young and elderly individuals. aug: au: Stackhouse SK Stevens JE Lee SCK Pearce KM Snyder-Mackler L Binder-Macleod SA sug: subj: Muscle Fatigue Muscle, Skeletal Physiology Aging Muscle Contraction Physiology Quadriceps Muscles Dynamometry Comparative Studies T-Tests Two-Way Analysis of Variance Paired T-Tests Adult Middle Age Aged Aged, 80 and Over Female Male Funding Source Human Adult: 19-44 years Middle Aged: 45-64 years Aged: 65+ years Aged, 80 & over Female Male ab: BACKGROUND AND PURPOSE: Researchers studying central activation of muscles in elderly subjects (> or = 65 years of age) have investigated activation in only the nonfatigued state. This study examined the ability of young and elderly people to activate their quadriceps femoris muscles voluntarily under both fatigued and nonfatigued conditions to determine the effect of central activation failure on age-related loss of force. SUBJECTS AND METHODS: Twenty young subjects (11 men, 9 women; mean age = 22.67 years, SD = 4.14, range = 18-32 years) and 17 elderly subjects (8 men, 9 women; mean age = 71.5 years, SD = 5.85, range = 65-84 years) participated in this study. Subjects were seated on a dynamometer and stabilized. Central activation was quantified, based on the change in force produced by a 100-Hz, 12-pulse electrical train that was delivered during a 3- to 5-second isometric maximum voluntary contraction (MVC) of the quadriceps femoris muscle. Next, subjects performed 25 MVCs (a 5-second contraction with 2 seconds of rest) to fatigue the muscle. During the last MVC, central activation was measured again. RESULTS: In the nonfatigued state, elderly subjects had lower central activation than younger subjects. In the fatigued state, this difference became larger. DISCUSSION AND CONCLUSION: Central activation of the quadriceps femoris muscle in elderly subjects was reduced in both the fatigued and nonfatigued states when compared with young subjects. Some part of age-related weakness, therefore, may be attributed to failure of central activation in both the fatigued and nonfatigued states. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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