Bone mineral density and content of collegiate throwers: influence of maximum strength.
J Sports Med Phys Fitness
; 49(4): 464-73, 2009 Dec.
Article
en En
| MEDLINE
| ID: mdl-20087308
ABSTRACT
AIM:
Bone changes in size and density in response to different levels of stress. Alterations to bone mineral density (BMD) appear to occur in a site specific manner. Even though BMD has been examined in many populations there is a paucity of data looking at strength-power athletes, such as throwers. Therefore, the purpose of this study was to examine the BMD of a group of USA Division I collegiate throwers (e.g. shot put, discus, etc.).METHODS:
Seven throwers (4 males; 3 females) who were 19.0 + or - 0.9 years had their BMD compared to an age matched control group (n = 14; 8 women and 6 men) and normative data. BMD was measured with dual X-ray absorptometry. Potential right/left side and sex difference in BMD were also examined. Maximal isometric strength was assessed using a mid-thigh pull while standing on a forceplate which generated force-time curves. Peak force (PF) and normalized peak force (PFa) were then correlated with BMDs.RESULTS:
Generally, throwers had denser bones with male throwers tending to have a greater total BMD (P < or = 0.05). The dominant arm BMD was slightly greater when compared to non-dominant arm (P < or = 0.05). Furthermore, total body BMD was related to PF (r = 0.68, r(2) = 0.46) and PFa (r = 0.56, r(2) = 0.31).CONCLUSIONS:
Throwers have greater BMDs than non-athletes and most other athletes. However, throwers only showed a small indication of sidedness. It is likely that the BMDs observed in this study stem from the training intervention (e.g. whole body heavy lifting) undertaken by this population.
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Base de datos:
MEDLINE
Asunto principal:
Atletismo
/
Densidad Ósea
/
Fuerza Muscular
/
Contracción Isométrica
Tipo de estudio:
Observational_studies
Idioma:
En
Revista:
J Sports Med Phys Fitness
Año:
2009
Tipo del documento:
Article