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Massa magra e massa óssea do fémur proximal em jovens dos 10-12 anos - importância da frequência e do volume da atividade física vigorosa
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Este trabalho teve como objetivo analisar associações entre a atividade física diária de intensidade vigorosa, especificamente o número de eventos e o tempo total acumulado e a composição corporal músculo-esquelética, ajustadas para a massa e altura corporal e para a maturidade em 115 jovens dos 10 aos 12 anos. As variáveis músculo-esqueléticas analisadas incluíram a densidade mineral óssea (DMO) de diversas regiões do fémur proximal (colo do fémur, trocânter e intertroncânter, colo superolateral, colo inferomedial e fémur proximal total) e a razão entre a massa magra total e a massa gorda total (MM/MG). As análises foram conduzidas transversalmente e retrospetivamente (taxa de variação), considerando o follow-up de um ano nas variáveis músculo-esqueléticas e a atividade física no final do follow-up. Os resultados mostram que o número de eventos diários de atividade física de intensidade vigorosa se encontra fortemente associado ao tempo total acumulado desta atividade (r=0,0943 para raparigas, r=0,903 para rapazes, p<0,001). Relativamente à DMO do fémur proximal e respetivas regiões, o tempo total acumulado surge como preditor significativo nos rapazes (p<0,05) com exceção do colo superolateral, mas não nas raparigas. Nas raparigas os resultados não são lineares revelando que as raparigas de 10-12 anos que acumulam pelo menos 14 min/d de atividade física vigorosa apresentam taxas de variação mais favoráveis da DMO do fémur proximal, e em particular do trocânter, do que as raparigas que acumulam menos de 9 min/d. O número de eventos diários de atividade física vigorosa evidenciou-se somente como preditor da MM/MG das raparigas.
The objective of this study was to analyze associations between daily physical activity of vigorous intensity, specifically the number of events and total accumulated time and musculoskeletal body composition, adjusted for body mass and height and for maturity in 115 youngsters from 10 at age 12. The musculoskeletal variables analyzed included bone mineral density (BMD) of several regions of the proximal femur (femoral neck, trochanter and intertroncanter, colosuperolateral, inferomedial neck and total proximal femur) and the ratio of total lean mass to fat mass total (MM / MG). The analyzes were conducted transversely and retrospectively (rate of change), considering the one-year follow-up on the musculoskeletal variables and the physical activity at the end of the follow-up. The results show that the number of daily events of vigorous intensity physical activity is strongly associated with the total accumulated time of this activity (r = 0.0943 for girls, r = 0.903 for boys, p <0.001). Concerning BMD of the proximal femur and respective regions, the total accumulated time appears as a significant predictor in boys (p <0.05), with the exception of the superolateral neck, but not in the girls. In girls the results are not linear, revealing that girls aged 10-12 years accumulating at least 14 min / d of vigorous physical activity have more favorable rates of BMD variation in the proximal femur, and in particular the trochanter, than girls which accumulate less than 9 min / d. The number of daily events of vigorous physical activity was only evidenced as a predictor of girls' MM / MG.
The objective of this study was to analyze associations between daily physical activity of vigorous intensity, specifically the number of events and total accumulated time and musculoskeletal body composition, adjusted for body mass and height and for maturity in 115 youngsters from 10 at age 12. The musculoskeletal variables analyzed included bone mineral density (BMD) of several regions of the proximal femur (femoral neck, trochanter and intertroncanter, colosuperolateral, inferomedial neck and total proximal femur) and the ratio of total lean mass to fat mass total (MM / MG). The analyzes were conducted transversely and retrospectively (rate of change), considering the one-year follow-up on the musculoskeletal variables and the physical activity at the end of the follow-up. The results show that the number of daily events of vigorous intensity physical activity is strongly associated with the total accumulated time of this activity (r = 0.0943 for girls, r = 0.903 for boys, p <0.001). Concerning BMD of the proximal femur and respective regions, the total accumulated time appears as a significant predictor in boys (p <0.05), with the exception of the superolateral neck, but not in the girls. In girls the results are not linear, revealing that girls aged 10-12 years accumulating at least 14 min / d of vigorous physical activity have more favorable rates of BMD variation in the proximal femur, and in particular the trochanter, than girls which accumulate less than 9 min / d. The number of daily events of vigorous physical activity was only evidenced as a predictor of girls' MM / MG.
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Atividade Física Vigorosa Densidade Mineral Óssea Crianças Fémur Proximal Acelerometria DXA Volume de Atividade Física Frequência da Atividade Física Massa Magra Accelerometry Vigorous Physical Activity Bone Mineral Density Children Proximal Femur DXA Physical Activity Volume Physical Activity Frequency Lean Mass