The rate of velocity development associates with muscle echo intensity, but not muscle cross-sectional area in older men.
Aging Clin Exp Res
; 30(7): 861-865, 2018 Jul.
Article
em En
| MEDLINE
| ID: mdl-28936628
ABSTRACT
The examination of mechanisms contributing to the age-related reductions in rapid velocity development is limited. The purpose of this study was to examine the influence of muscle cross-sectional area (CSA) and echo intensity (EI) on plantarflexor rate of velocity development (RVD) in older adults. Twenty-two men (mean ± SD age = 69 ± 3 years) performed three maximal plantarflexion voluntary isokinetic muscle actions at a velocity of 2.09 rad · s-1. Peak RVD was determined as the peak derivative of the velocity-time curve from the onset of velocity development to the onset of the load range. B-mode ultrasound was used to examine CSA and EI from the lateral and medial gastrocnemius. Plantarflexor RVD was related to EI (r = -0.491, P = 0.020), but not CSA (r = -0.003, P = 0.989). The findings of the present investigation suggest that alterations in muscle tissue composition (i.e., increase in intramuscular fat and/or fibrous tissue) may influence the ability of older adults to rapidly accelerate their limb.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Envelhecimento
/
Músculo Esquelético
Tipo de estudo:
Diagnostic_studies
/
Prevalence_studies
/
Risk_factors_studies
Limite:
Aged
/
Humans
/
Male
Idioma:
En
Revista:
Aging Clin Exp Res
Assunto da revista:
GERIATRIA
Ano de publicação:
2018
Tipo de documento:
Article
País de afiliação:
Estados Unidos