Body Composition as a Mediator between Cardiorespiratory Fitness and Bone Mass during Growth.
Med Sci Sports Exerc
; 52(2): 498-506, 2020 02.
Article
en En
| MEDLINE
| ID: mdl-31939913
ABSTRACT
INTRODUCTION AND PURPOSE:
To examine the effect of cardiorespiratory fitness (CRF) and muscle power output (MPO) on bone mass of prepubertal and pubertal children using lean mass (LM) and percentage of fat mass (%FM) as mediator variables. The hypothesis was that both LM and %FM would be independent mediators of the relationships during the sexual maturation period.METHODS:
We analyzed 200 children (88 boys and 112 girls [11.5 ± 2.0 yr]). Body composition was analyzed by bone densitometry, and indirect calorimetry and cycle ergometer were used to calculate VËO2peak (mL·kg·min) and MPO (W) during an incremental exercise test. Sample was divided by pubertal status.RESULTS:
In the prepubertal group, LM and %FM acted independently as mediators in the relationship between bone mass and CRF or MPO (22%-25% for LM and 37%-50% for %FM, respectively). In pubertal children, LM acted as mediator at 37%.CONCLUSIONS:
Although the independent mediator role of LM and %FM in the associations between CRF or MPO and bone mass was present during the prepubertal stage, only LM remain its mediator role in these associations during the postpubertal period. Therefore, with growth and sexual maturation, the full effect of LM seems to increase, whereas the influence of %FM seems to disappear.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Maduración Sexual
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Densidad Ósea
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Distribución de la Grasa Corporal
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Capacidad Cardiovascular
Límite:
Adolescent
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Child
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Female
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Humans
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Male
Idioma:
En
Revista:
Med Sci Sports Exerc
Año:
2020
Tipo del documento:
Article