title: Changes in Bone Biomarkers, BMC, and Insulin Resistance Following a 10-Week Whole Body Vibration Exercise Program in Overweight Latino Boys.
abstract: OBJECTIVE
  With the childhood obesity epidemic, efficient methods of exercise are sought to improve health. We tested whether whole body vibration (WBV) exercise can positively affect bone metabolism and improve insulin/glucose dynamics in sedentary overweight Latino boys.
  
  
  METHODS
  Twenty Latino boys 8-10 years of age were randomly assigned to either a control (CON) or 3 days/wk WBV exercise (VIB) for 10-wk.
  
  
  RESULTS
  Significant increases in BMC (4.5 ± 3.2%; p=0.01) and BMD (1.3 ± 1.3%; p<0.01) were observed for the VIB group when compared to baseline values. For the CON group BMC significantly increased (2.0 ± 2.2%; p=0.02), with no change in BMD (0.8 ± 1.3%; p=0.11). There were no significant between group changes in BMC or BMD. No significant change was observed for osteocalcin and (collagen type I C-telopeptide) CTx for the VIB group. However, osteocalcin showed a decreasing trend (p=0.09) and CTx significantly increased (p<0.03) for the CON group. This increase in CTx was significantly different between groups (p<0.02) and the effect size of between-group difference in change was large (-1.09). There were no significant correlations between osteocalcin and measures of fat mass or insulin resistance for collapsed data.
  
  
  CONCLUSIONS
  Although bone metabolism was altered by WBV training, no associations were apparent between osteocalcin and insulin resistance. These findings suggest WBV exercise may positively increase BMC and BMD by decreasing bone resorption in overweight Latino boys.
authors.affiliation: 1. The Clinical Exercise Research Center, Division of Biokinesiology and Physical Therapy at the School of Dentistry, University of Southern California, Los Angeles, USA.
authors.forename: David N
authors.initials: DN
authors.lastname: Erceg
authors.affiliation: 1. The Clinical Exercise Research Center, Division of Biokinesiology and Physical Therapy at the School of Dentistry, University of Southern California, Los Angeles, USA.
authors.forename: Lindsey J
authors.initials: LJ
authors.lastname: Anderson
authors.affiliation: 1. The Clinical Exercise Research Center, Division of Biokinesiology and Physical Therapy at the School of Dentistry, University of Southern California, Los Angeles, USA.
authors.forename: Chun M
authors.initials: CM
authors.lastname: Nickles
authors.affiliation: 2. Center for Transdisciplinary Research on Energetics and Cancer, Keck School of Medicine, University of Southern California, Los Angeles, USA.
authors.forename: Christianne J
authors.initials: CJ
authors.lastname: Lane
authors.affiliation: 3. Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, USA.
authors.forename: Marc J
authors.initials: MJ
authors.lastname: Weigensberg
authors.affiliation: 1. The Clinical Exercise Research Center, Division of Biokinesiology and Physical Therapy at the School of Dentistry, University of Southern California, Los Angeles, USA.
authors.forename: E Todd
authors.initials: ET
authors.lastname: Schroeder
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000378:metabolism*; D015519:Bone Density; D002648:Child; D015444:Exercise; D006630:Hispanic or Latino; D006801:Humans; D007333:Insulin Resistance / Q000235:genetics; D008297:Male; D009765:Obesity / Q000378:metabolism* / Q000503:physiopathology / Q000628:therapy; D015675:Osteocalcin / Q000235:genetics / Q000378:metabolism; D050177:Overweight / Q000378:metabolism* / Q000503:physiopathology / Q000628:therapy; D011897:Random Allocation; D014732:Vibration
chemical_list: D015415:Biomarkers; D015675:Osteocalcin
keywords: exercise; fat mass; insulin sensitivity; osteocalcin; prepubescent