title: [Strength training improves insulin sensitivity and plasma lipid levels without altering body composition in overweight and obese subjects].
abstract: OBJECTIVE
  To assess the effect of long-term strength training on insulin sensitivity, lipid profile, and body composition in overweight and obese subjects.
  
  
  METHODS
  A prospective, randomized, interventional study in 16 overweight or obese subjects aged 18-35years who were investigated before and at the end of 8weeks of strength training. The experimental group (n=8) followed a strength training program consisting of 4 sessions per week at 50% to 80% of repetition maximum (RM), estimated through the 1RM test. The control group (n=8) did not perform the training program. Glucose, insulin, total cholesterol, triglycerides, HDL-C, VLDL-C, and LDL-C levels and arterial index were determined. Insulin sensitivity was measured by calculating HOMA-IR (Homeostatic Model Assessment-Insulin Resistance). Indicators of body composition included weight, height, waist circumference, body fat, fat weight, muscle mass, somatotype chart and distance.
  
  
  RESULTS
  At the end of intervention, the experimental group showed a decrease of insulin sensitivity (3.5±0.9 vs. 2.9±1.2; p=0.04), LDL-C (106.9±20.8 vs. 95.5±14.2; p=0.03), and arterial index (4.0±0.6 vs. 3.5±0.5; p=0.01), as well as an increase in HDL-C levels (43.7±8.8 vs. 46.9±5.6; p=0.04), while the control group remained stable. There were no significant differences between groups in body composition, somatotype chart and distance after training.
  
  
  CONCLUSIONS
  In overweight and obese subjects, strength training for eight weeks improved insulin sensitivity and lipid profile without altering body composition.
authors: Programa de Profesional en Deporte y Actividad Física, Escuela Nacional del Deporte, Cali, Colombia.
authors: Oscar
authors: O
authors: Hernán Jiménez
authors: Robinson
authors: R
authors: Ramírez-Vélez
mesh_terms: D000293:Adolescent; D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D001823:Body Composition; D006801:Humans; D007328:Insulin / Q000097:blood; D007333:Insulin Resistance; D008055:Lipids / Q000097:blood*; D008297:Male; D009765:Obesity / Q000097:blood / Q000473:pathology / Q000628:therapy; D050177:Overweight / Q000097:blood / Q000473:pathology / Q000628:therapy*; D011446:Prospective Studies; D055070:Resistance Training; D049629:Waist-Hip Ratio; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D007328:Insulin; D008055:Lipids