title: [Correlation of age, IGF-1 serum levels, muscular mass index and their influence as determinants of isokinetic variables in patients with osteoporosis].
abstract: BACKGROUND
  Bone and skeletal muscle mass loss is related to age. Mechanisms by which they interact have not been well established.
  
  
  OBJECTIVE
  To establish a relationship of age with serum levels of IGF-1, skeletal muscle and appendicular muscle mass index, and their influence in isokinetic parameters in osteoporotic female patients.
  
  
  METHODS
  Pearson correlation coefficient and linear regression analyses were used.
  
  
  RESULTS
  There were 38 patients with a mean age of 65.16 years (range: 50-84 years), mean appendicular skeletal mass index (ASMI) of 6.3 kg/m2 (range: 4.3-8.3) and mean skeletal mass index (SMI) of 12.4 kg/m2 (range: 9.6-15.7), mean serum IGF-1 levels of 82.97 ng/ml (range: 22-177). Linear regression predicted hip mineral bone density by SMI (p = 0.19) and age (p = 0.017, r = 0.50). Some isokinetic parameters had a positive correlation for work with age. Knee acceleration time had a positive correlation with age.
  
  
  CONCLUSIONS
  Osteoporosis and sarcopenia may have related pathophysiologic mechanisms. Growth factor study must include the influence of sex hormones. Some isokinetic parameters are determined by the predominant muscle fiber, skeletal mass index and age.
authors.affiliation: Rehabilitación de Columna, Centro Nacional de Rehabilitación. rcoronado@cnr.gob.mx
authors.forename: Roberto
authors.initials: R
authors.lastname: Coronado-Zarco
authors.forename: María del Pilar
authors.initials: Mdel P
authors.lastname: Diez-García
authors.forename: Daniel
authors.initials: D
authors.lastname: Chávez-Arias
authors.forename: Saúl Renán
authors.initials: SR
authors.lastname: León-Hernández
authors.forename: Eva
authors.initials: E
authors.lastname: Cruz-Medina
authors.forename: Aurelia
authors.initials: A
authors.lastname: Arellano-Hernández
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000033:anatomy & histology*; D010024:Osteoporosis / Q000097:blood* / Q000503:physiopathology*; D010865:Pilot Projects
chemical_list: D007334:Insulin-Like Growth Factor I