title: Age-related differences on low back pain and postural control during one-leg stance: a case-control study.
abstract: OBJECTIVE
  The prevalence of chronic low back pain (CLBP) is higher in older than in younger adults and is associated with poor postural control and falls. The objective of this study was to compare the postural control of younger and older subjects with and without CLBP during a one-leg stance.
  
  
  METHODS
  Twenty subjects with and 20 subjects without nonspecific CLBP participated in the study. Each group contained 10 younger (50% males; mean age: 31 years) and 10 older adults (50% males; mean age 71 years). The subjects performed three 30-s trials of a one-leg stance on a force platform. Balance parameters were computed to quantify postural control, including center of pressure (COP) area, mean velocity, and mean frequency in the anteroposterior and mediolateral directions.
  
  
  RESULTS
  Participants with CLBP presented significantly poorer balance (P < 0.05) than participants without CLBP. The effect size was large for younger adults (d = 1.44) and small for older adults (d = 0.40). Older adults with CLBP presented poorer balance than younger adults with CLBP (large effect size, d = 1.24).
  
  
  CONCLUSIONS
  The findings indicate that CLBP affects the balance of both younger and older adults, and that the age-related changes also affect balance and modify the magnitude of CLBP effects on balance.
authors.affiliation: Laboratory of Functional Evaluation and Human Motor Performance (LAFUP), Center for Health Science Research, Universidade Norte do Paraná (UNOPAR), 675 Paris Av, Londrina, CEP 86041-120, Brazil. rubensalex@hotmail.com.|Doctoral and Masters Program in Rehabilitation Sciences UEL/UNOPAR, 675 Paris Av, Londrina, PR, Brazil. rubensalex@hotmail.com.|Post-Graduate Program in Health Sciences, Universidade de Cuiabá (UNIC), 3399 Historiador Rubens de Mendonça AV, Cuiabá, MT, Brazil. rubensalex@hotmail.com.
authors.forename: Rubens A
authors.initials: RA
authors.lastname: da Silva
authors.affiliation: Physical Therapy and Neuroscience Departments, Wertheims' Colleges of Nursing and Health Sciences and Medicine, Florida International University (FIU), 11200 SW 8th St., AHC3-430, Miami, FL, USA.
authors.forename: Edgar R
authors.initials: ER
authors.lastname: Vieira
authors.affiliation: Laboratory of Functional Evaluation and Human Motor Performance (LAFUP), Center for Health Science Research, Universidade Norte do Paraná (UNOPAR), 675 Paris Av, Londrina, CEP 86041-120, Brazil.
authors.forename: Carlos E
authors.initials: CE
authors.lastname: Carvalho
authors.affiliation: Laboratory of Functional Evaluation and Human Motor Performance (LAFUP), Center for Health Science Research, Universidade Norte do Paraná (UNOPAR), 675 Paris Av, Londrina, CEP 86041-120, Brazil.|Doctoral and Masters Program in Rehabilitation Sciences UEL/UNOPAR, 675 Paris Av, Londrina, PR, Brazil.
authors.forename: Marcio R
authors.initials: MR
authors.lastname: Oliveira
authors.affiliation: Laboratory of Functional Evaluation and Human Motor Performance (LAFUP), Center for Health Science Research, Universidade Norte do Paraná (UNOPAR), 675 Paris Av, Londrina, CEP 86041-120, Brazil.|Doctoral and Masters Program in Physical Therapy, UNICID, 448/475 Cesário Galeno St., São Paulo, SP, Brazil.
authors.forename: César F
authors.initials: CF
authors.lastname: Amorim
authors.affiliation: Laboratory of Functional Evaluation and Human Motor Performance (LAFUP), Center for Health Science Research, Universidade Norte do Paraná (UNOPAR), 675 Paris Av, Londrina, CEP 86041-120, Brazil.|Post-Graduate Program in Health Sciences, Universidade de Cuiabá (UNIC), 3399 Historiador Rubens de Mendonça AV, Cuiabá, MT, Brazil.
authors.forename: Elias Nasrala
authors.initials: EN
authors.lastname: Neto
mesh_terms: D000058:Accidental Falls; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D001696:Biomechanical Phenomena; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007866:Leg; D017116:Low Back Pain / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D004856:Postural Balance
keywords: Aging; Posture; Rehabilitation; Spine, biomechanics