Abstract：
:Impact activity is an important contributor to bone accrual. Children engaging in such activity have been shown to have greater bone mineral density (BMD) than their peers. This cross-sectional study was designed to quantify the association between BMD and impact activity in pre-pubescent girls, specifically examining for a dose-dependent relationship. Fifty 7-11-year-old Caucasian female gymnasts were grouped by hours of gymnastics participation during a 6-month period: LOW, 1-8 hours/week (hrs/wk); HIGH, >8 hrs/wk. They were compared with 20 controls, with height, weight, age, and Tanner stage averages matched to the gymnasts. Total body, forearm, hip, lumbar spine BMD, and body composition were measured by dual energy X-ray absorptiometry (DXA). Strength was measured by one repetition maximum testing, calcium intake was quantified by questionnaire, and physical activity was measured by questionnaire and activity monitors. Total and regional BMD were greater in the HIGH group than the controls (P<0.05). Furthermore, both total and forearm BMD were greater in the HIGH group than in the LOW group, and greater in the LOW group than in the controls (P<0.05). Simple regression analysis between hrs/wk of gymnastics activity versus total and regional BMD (using maturation-adjusted Z scores) yielded a positive slope for each site. R2 was greatest for hip BMD (R2 = 0.25), and least for lumbar spine (R2 = 0.10) (P<0.0001). In conclusion, in this group of pre-pubescent girls, we observed a dose-dependent relationship between BMD and hrs/wk of impact activity; even moderate doses of impact activity were associated with increased BMD.
journal_name
Calcif Tissue Intjournal_title
Calcified tissue internationalauthors
Scerpella TA,Davenport M,Morganti CM,Kanaley JA,Johnson LMdoi
10.1007/s00223-001-1131-xsubject
Has Abstractpub_date
2003-01-01 00:00:00pages
24-31issue
1eissn
0171-967Xissn
1432-0827journal_volume
72pub_type
杂志文章abstract：:Prior exposure to PTH markedly decreased the responsiveness of isolated, cultured bone cells to the stimulatory effect of the hormone on cyclic AMP formation. This process of desensitization developed within 30 min, persisted during prolonged incubation of the cells in PTH-free medium, and could not be attributed to e...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02408528
更新日期：1980-01-01 00:00:00
abstract：:This study aimed to evaluate the association between objectively measured habitual physical activity and calcaneal and forearm bone mineral density (BMD, g/cm(2)), one mechanically more loaded and one less loaded skeletal region, in children aged 6-8 years. BMD was measured in 297 boys and 265 girls by peripheral dual...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-006-0137-9
更新日期：2007-01-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002230010006
更新日期：2001-04-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00295947
更新日期：1994-04-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900482
更新日期：1998-07-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02553298
更新日期：1986-08-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00369209
更新日期：1996-12-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02411281
更新日期：1982-09-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-006-0227-8
更新日期：2007-03-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-016-0132-8
更新日期：2016-08-01 00:00:00
abstract：:Racial differences in bone mineral density (BMD) appear to account in part for racial differences in the incidence of osteoporosis and fractures. We previously reported that the greater BMD in adult blacks compared with whites is associated with a higher serum 17 beta-estradiol and greater secretion of growth hormone ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-001-1068-0
更新日期：2002-03-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900543
更新日期：1998-11-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02565132
更新日期：1991-08-01 00:00:00
abstract：:Aging bone shows a progressive decline in mass and strength. Previous studies have suggested that bone marrow stem cells are reduced with aging and that this could be responsible, in part, for age-associated bone deficits. We measured the number of osteoprogenitor cells present in the bone marrow from adult and aged r...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00296343
更新日期：1995-02-01 00:00:00
abstract：:The current studies were intended to determine whether the anabolic effects of calcitonin (CT) on human osteoblast-line cells were (1) unique to osteosarcoma cells or also evident in osteoblast-line cells derived from normal human bone; and/or (2) associated with effects on several insulin-like growth factor (IGF) sys...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002230001112
更新日期：2000-09-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-019-00528-x
更新日期：2019-06-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-015-0091-5
更新日期：2016-03-01 00:00:00
abstract：:The purpose of the present work was to investigate the appearance of ossification centers in human femur by Dual-energy X-ray Absorptiometry (DXA), comparing densitometric data with morphogenetic events. Posteroanterior scans were performed on 31 dried femora (from 11.5 weeks of conceptual age to 1 year of postnatal l...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/pl00005841
更新日期：2000-04-01 00:00:00
abstract：:Although hypogonadism is a risk factor for bone loss and fractures, the different etiopathophysiology and hormonal profile of classical and obesity-induced hypogonadism may lead to differences in musculoskeletal profile. This is a cross-sectional study of hypogonadal men between 40 and 74 years old. Our outcomes inclu...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-017-0316-x
更新日期：2017-12-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-016-0170-2
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journal_title：Calcified tissue international
pub_type： 杂志文章,随机对照试验
doi：10.1007/s00223-007-9012-6
更新日期：2007-05-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章,meta分析
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更新日期：2019-07-01 00:00:00
abstract：:Osteoclastic bone resorption can be induced within the auditory bulla of the Mongolian gerbil by minute increases in air pressure. The objective of this study was to determine the rate at which osteoclasts are induced in areas of resorption and to compare the rate of osteoblast recruitment. Stainless steel tubes were ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02556026
更新日期：1989-11-01 00:00:00
abstract：:In general, physical exercise appears to have favorable effects on the skeleton. However, a few recent reports have described negative effects, including reduced bone density (BMD) and high bone turnover in runners. The aim of our study was to compare endurance runners to controls with respect to BMD at different site...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900366
更新日期：1997-12-01 00:00:00
abstract：:To investigate the effect of low doses of intranasal salmon calcitonin on plasma cyclic AMP (cAMP) and serum ionized calcium, 40 healthy postmenopausal women were randomized to receive a single dose of either placebo or 50, 100, or 200 IU of salmon calcitonin as a nasal spray. Blood samples were collected throughout a...
journal_title：Calcified tissue international
pub_type： 临床试验,杂志文章,随机对照试验
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更新日期：1990-01-01 00:00:00
abstract：:The peptide hormone calcitonin is a potent inhibitor of osteoclastic resorption, but it is unstable and poorly absorbed following oral administration. Conjugates of salmon calcitonin covalently linked to low-molecular-weight amphiphilic polymers show improved stability and absorption. The purpose of this study was to ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-002-1051-4
更新日期：2003-09-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-011-9552-7
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journal_title：Calcified tissue international
pub_type： 杂志文章
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更新日期：2021-02-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-004-0134-9
更新日期：2005-02-01 00:00:00
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journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-009-9324-9
更新日期：2010-02-01 00:00:00
