[Influence of body composition and age on bone density in relation to levels of physical activity].
OBJECTIVE
Verify the physical activity level (PAL), to what extent each body composition component and age influence bone density (BD).


METHODS
Samples of 22 men and 42 women (21-51 years) classified with recommended and not recommended PAL for health. The femur's BD measured using DXA.


RESULTS
Using a analyzing the stepwise linear regression (p < or = .05), the age explained negatively BD for all groups, except men with recommended PAL. Among women group with not recommended PAL, the relative fat (%F) and body fat (BF) explained the BD increasing to 0.007 g/cm(2) per BF kilogram in all regions of interest in the femur.


CONCLUSIONS
The BD in Ward's area has been mostly influenced by age in women. The FM and %F have positive influence on BD among women with low PAL.
Nascimento
Thales Boaventura Rachid
TB
Grupo de Estudos em Medida e Avaliação, Cineantropometria e Desempenho Humano, Universidade Católica de Brasília, Brasília, DF, Brasil.
Glaner
Maria Fátima
MF
Paccini
Marina Kanthack
MK
D000328:Adult; D000367:Age Factors; D001823:Body Composition / Q000502:physiology*; D015519:Bone Density / Q000502:physiology*; D005260:Female; D005269:Femur / Q000502:physiology*; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D018709:Statistics, Nonparametric; D055815:Young Adult