Rate of force development and rapid muscle activation characteristics of knee extensors in very old men.
Exp Gerontol
; 124: 110640, 2019 09.
Article
em En
| MEDLINE
| ID: mdl-31252160
ABSTRACT
The age-related decrease in neuromuscular performance is usually accentuated in very old age (>80â¯yr) as evidenced by a marked reduction in maximal force production. However, little is known about the ability to rapidly produce force, which limits daily activities and increase the risk of falling. We aimed to assess rapid force production characteristics and rate of muscle activation of the knee extensors in 15 very old (82⯱â¯1â¯yr) vs 12 young (24⯱â¯4â¯yr) men. Maximal force (Fmax) and maximal rate of force development (RFDmax) were determined during separated specific isometric contractions. EMG from the vastus lateralis was analyzed to assess the rate of EMG rise (RER). Finally, RFD and RER were examined at time intervals of 0-50, 50-100, 100-200, 0-200â¯ms and 0-30, 0-50, 0-75â¯ms, respectively. We reported lower Fmax (414⯱â¯91â¯N vs. 661⯱â¯139â¯N) and absolute RFDmax (8720⯱â¯2056â¯N*s-1vs. 5700⯱â¯2474â¯N*s-1) in the very old men compared to young men (Pâ¯<â¯0.01). When normalized to Fmax, RFDmax was similar between groups. Normalized RFD at 0-50 and 0-200â¯ms were lower (-34% andâ¯-â¯46%, Pâ¯=â¯0.04) for the very old men, while no difference was observed at 50-100â¯ms and 100-200â¯ms. RER values were higher (~346%, Pâ¯<â¯0.01) for the young men at every time interval. These data suggest that the decline in RFDmax is associated with the decrease in Fmax. Impairments in RFD were accentuated in the first phase of the contraction, which has been associated in the literature with impairments in neural factors associated with aging.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Envelhecimento
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Músculo Esquelético
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Contração Isométrica
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Articulação do Joelho
Limite:
Adult
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Aged80
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Humans
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Male
Idioma:
En
Revista:
Exp Gerontol
Ano de publicação:
2019
Tipo de documento:
Article