title: Analysis of postural control and muscular performance in young and elderly women in different age groups.
abstract: BACKGROUND
  muscle strength and power are two factors affecting balance. The impact of muscle strength and power on postural control has not been fully explored among different age strata over sixty.
  
  
  OBJECTIVE
  the aim of the present study was to assess the muscle strength and power of elderly women in different age groups and determine their correlation with postural control.
  
  
  METHODS
  eighty women were divided into four groups: the young 18-30 age group (n=20); the 60-64 age group (n=20); the 65-69 age group (n=20); and the 70-74 age group (n=20). The participants underwent maximum strength (one repetition maximum or 1-RM) and muscle power tests to assess the knee extensor and flexor muscles at 40%, 70%, and 90% 1-RM intensity. The time required by participants to recover their balance after disturbing their base of support was also assessed.
  
  
  RESULTS
  the elderly women in the 60-64, 65-69, and 70-74 age groups exhibited similar muscle strength, power, and postural control (p>0.05); however, these values were lower than those of the young group (p<0.05) as expected. There was a correlation between muscle strength and power and the postural control performance (p<0.05).
  
  
  CONCLUSIONS
  despite the age difference, elderly women aged 60 to 74 years exhibited similar abilities to generate strength and power with their lower limbs, and this ability could be one factor that explains the similar postural control shown by these women.
authors: Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors: Matheus M
authors: MM
authors: Gomes
authors: Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors: Júlia G
authors: JG
authors: Reis
authors: Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors: Regiane L
authors: RL
authors: Carvalho
authors: Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors: Erika H
authors: EH
authors: Tanaka
authors: Escola de Educação Física e Esporte de Ribeirão Preto, USP, Ribeirão Preto, SP, Brazil.
authors: Miguel A
authors: MA
authors: Hyppolito
authors: Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
authors: Daniela C C
authors: DC
authors: Abreu
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008875:Middle Aged; D053580:Muscle Strength; D004856:Postural Balance / Q000502:physiology*; D055815:Young Adult
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