Please use this identifier to cite or link to this item: https://ahro.austin.org.au/austinjspui/handle/1/13251
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dc.contributor.authorYoung, Nen
dc.contributor.authorFormica, Cen
dc.contributor.authorSzmukler, Gen
dc.contributor.authorSeeman, Egoen
dc.date.accessioned2015-05-16T03:04:15Z
dc.date.available2015-05-16T03:04:15Z
dc.date.issued1994-02-01en
dc.identifier.citationThe Journal of Clinical Endocrinology and Metabolism; 78(2): 449-54en
dc.identifier.govdoc8106634en
dc.identifier.otherPUBMEDen
dc.identifier.urihttp://ahro.austin.org.au/austinjspui/handle/1/13251en
dc.description.abstractExercise is recommended as a means of preventing osteoporosis. When intensive, weight-bearing exercise is often associated with hypogonadism. As weight-bearing exercise is likely to be more beneficial at weight-bearing than nonweight-bearing sites, and hypogonadism is likely to be more detrimental to trabecular than cortical bone, we tested the hypothesis that exercise and hypogonadism result in differing regional effects: net benefits at weight-bearing, predominantly cortical sites, and net deficits at nonweight-bearing trabecular-rich sites. Bone density (grams per cm2), body fat, and fat-free mass (kilograms) were measured using dual x-ray absorptiometry in 44 ballet dancers, aged 17.0 +/- 0.2 yr (mean +/- SEM), 18 sedentary amenorrheic girls with anorexia nervosa, and 23 girls of comparable age with regular menstrual cycles. Bone density, expressed as a percentage above or below the mean in the girls with regular menstrual cycles, was normal or elevated at weight-bearing sites in dancers [femoral neck, 3.1 +/- 1.7% (P = NS); Wards triangle, 4.1 +/- 2.3% (P = NS); trochanter, 5.9 +/- 1.9% (P < 0.05)] and normal or reduced at these sites in girls with anorexia nervosa [-10.5 +/- 3.8% (P < 0.05), -7.8 +/- 4.3% (P = NS), and -8.7 +/- 4.0% (P < 0.05), respectively]. By contrast, deficits similar to those in girls with anorexia nervosa were found in dancers at nonweight-bearing sites [ribs, -5.7 +/- 0.8% (P < 0.01); arms, -4.6 +/- 1.1% (P < 0.01); skull, -5.9 +/- 1.3% (P < 0.01)] before, but not after, correcting for fat mass. Fat mass was 7.8 +/- 0.4 kg in dancers, similar to that in girls with anorexia nervosa (6.3 +/- 0.7 kg) and lower than that in girls with regular menstrual cycles (16.8 +/- 1.6 kg; P < 0.01). The net result of vigorous exercise, hypogonadism, and leanness in athletic amenorrhea may not be generalized osteoporosis. Weight-bearing exercise may offset the effects of hypogonadism at predominantly cortical weight-bearing sites, such as the proximal femur. Non-weight-bearing sites and weight-bearing sites containing substantial amounts of trabecular bone, such as the lumbar spine, may be adversely affected by hypogonadism while benefiting little from weight-bearing exercise. Deficits at nonweight-bearing sites may be attenuated by maintenance of body weight.en
dc.language.isoenen
dc.subject.otherAbsorptiometry, Photonen
dc.subject.otherAdolescenten
dc.subject.otherAdulten
dc.subject.otherAmenorrhea.physiopathologyen
dc.subject.otherAnorexia Nervosa.physiopathologyen
dc.subject.otherBody Compositionen
dc.subject.otherBody Weight.physiologyen
dc.subject.otherBone Density.physiologyen
dc.subject.otherBone and Bones.metabolism.physiologyen
dc.subject.otherChilden
dc.subject.otherDancingen
dc.subject.otherExercise.physiologyen
dc.subject.otherFemaleen
dc.subject.otherFemur Neck.physiologyen
dc.subject.otherHumansen
dc.subject.otherHypogonadism.physiopathologyen
dc.subject.otherLinear Modelsen
dc.subject.otherMenstrual Cycle.physiologyen
dc.subject.otherMinerals.metabolismen
dc.subject.otherWeight-Bearingen
dc.titleBone density at weight-bearing and nonweight-bearing sites in ballet dancers: the effects of exercise, hypogonadism, and body weight.en
dc.typeJournal Articleen
dc.identifier.journaltitleThe Journal of Clinical Endocrinology and Metabolismen
dc.identifier.affiliationDepartment of Endocrinology, Austin Hospital, Heidelberg, Melbourne, Australiaen
dc.identifier.doi10.1210/jcem.78.2.8106634en
dc.description.pages449-54en
dc.relation.urlhttps://pubmed.ncbi.nlm.nih.gov/8106634en
dc.type.austinJournal Articleen
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextnone-
item.openairetypeJournal Article-
item.fulltextNo Fulltext-
item.cerifentitytypePublications-
item.languageiso639-1en-
crisitem.author.deptEndocrinology-
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