title: Effects of physical training on bone mineral density and bone metabolism.
abstract: The purpose of this study was to examine the influences of long-term walking training and walking and jumping training on bone mineral density (BMD) and bone metabolism. Data from 28 healthy premenopausal women was assessed. The subjects were divided into the walking group (WG; 17 women mean+/-SE age 35+/-2 years), and the walking and jumping group (WJG; 11 women mean+/-SE age 39+/-1 years). BMD was measured in the lumbar spine and proximal femur using dual energy X-ray absorptiometry (DXA). As markers of bone metabolism, this study was to measure bone formation markers, bone-alkaline phosphatase (B-ALP: measured by enzyme immunoassay/EIA) and osteocalcin (BGP: by radioimmunoassay/RI) as well as bone resorption markers, parathyroid hormone (PTH: measured by/RI) and type I collagen cross-linked N-telopeptides (NTx: by EIA). Despite the significant decrease in body weight (p<0.05), no corresponding decrease in BMD was observed. Moreover, no significant difference in bone markers BGP, PTH, and NTx was observed. B-ALP was significantly increased (p<0.05) after one year, and the rate of this increase was greater in the WJG than in the WG. It is thus concluded that walking training for one year is beneficial for the promotion of bone formation, and that jumping stimulus maintain BMD effectively.
authors.affiliation: Department of Sports Medicine, Graduate School of Medicine, Nagoya University.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Shibata
authors.forename: Isao
authors.initials: I
authors.lastname: Ohsawa
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Watanabe
authors.forename: Takayuki
authors.initials: T
authors.lastname: Miura
authors.forename: Yuzo
authors.initials: Y
authors.lastname: Sato
mesh_terms: D015502:Absorptiometry, Photon; D000222:Adaptation, Physiological / Q000502:physiology*; D000273:Adipose Tissue / Q000033:anatomy & histology; D000328:Adult; D015415:Biomarkers / Q000097:blood; D001774:Blood Chemical Analysis; D001794:Blood Pressure / Q000502:physiology; D015992:Body Mass Index; D015519:Bone Density / Q000502:physiology*; D001842:Bone and Bones / Q000378:metabolism*; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D010806:Physical Education and Training / Q000379:methods*; D016138:Walking / Q000502:physiology
chemical_list: D015415:Biomarkers