title: Echo intensity independently predicts functionality in sedentary older men.
abstract: The aim of this study was to examine the associations between quadriceps muscle functionality features in nonactive older men to determine predictors of functional performance.
  
  
  
  Quadriceps functional parameters, including quadriceps echo intensity (QEI), rate of torque development (RTD), and the 30 s sit-to-stand test (30SS), were assessed in 50 healthy sedentary older men (66 ± 5.4 years). RTD/QEI ratios were also calculated to identify the best predictor of functional performance.
  
  
  
  30SS performance was associated with RTD, muscle thickness, RTD-50/QEI, RTD-100/QEI, RTD-50/QEI/WBM, and RTD-100/QEI/WBM. A multiple stepwise linear regression demonstrated that QEI was the best single predictor of functional performance, explaining ∼30% of the 30SS variance.
  
  
  
  These results indicate that QEI was the strongest contributor to functionality of nonactive older men, suggesting that QEI may be an alternative tool for screening of muscle impairment that leads to decreased functional performance in this population. Muscle Nerve 55: 9-15, 2017.
authors.affiliation: Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Felizardo Street, 750 - Jardim Botânico, CEP: 90690-200, Porto Alegre, RS, Brazil.
authors.forename: Pedro
authors.initials: P
authors.lastname: Lopez
authors.affiliation: Centre for Human Performance, Exercise and Rehabilitation, Brunel University London, Kingston Lane, Uxbridge, United Kingdom.
authors.forename: Eurico Nestor
authors.initials: EN
authors.lastname: Wilhelm
authors.affiliation: Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Felizardo Street, 750 - Jardim Botânico, CEP: 90690-200, Porto Alegre, RS, Brazil.
authors.forename: Anderson
authors.initials: A
authors.lastname: Rech
authors.affiliation: Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Felizardo Street, 750 - Jardim Botânico, CEP: 90690-200, Porto Alegre, RS, Brazil.
authors.forename: Felipe
authors.initials: F
authors.lastname: Minozzo
authors.affiliation: Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Felizardo Street, 750 - Jardim Botânico, CEP: 90690-200, Porto Alegre, RS, Brazil.
authors.forename: Regis
authors.initials: R
authors.lastname: Radaelli
authors.affiliation: Exercise Research Laboratory (LAPEX), Federal University of Rio Grande do Sul (UFRGS), Felizardo Street, 750 - Jardim Botânico, CEP: 90690-200, Porto Alegre, RS, Brazil.
authors.forename: Ronei Silveira
authors.initials: RS
authors.lastname: Pinto
mesh_terms: D000368:Aged; D000375:Aging; D000704:Analysis of Variance; D017079:Exercise Tolerance / Q000502:physiology; D005260:Female; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D011187:Posture; D052097:Quadriceps Muscle / Q000502:physiology*; D057185:Sedentary Behavior; D019415:Torque
keywords: aging; functionality; muscle quality; muscular performance; ultrasonography