No abstract

O objetivo do presente estudo foi refletir sobre as relações entre o estado de vulnerabilidade e a adesão aos exercícios físicos na cidade do Rio de Janeiro. Para tanto, foram levantados dados sobre as características de 5.457 indivíduos que procuraram e iniciaram exercícios físicos em academias de ginástica; dados referentes à condição de miserabilidade na cidade; e dados referentes ao índice de Desenvolvimento Humano da cidade do Rio de Janeiro. Além disso, foram entrevistados sete indivíduos, sendo dois obesos, dois com histórico de doença cardiovascular e três idosos. Os resultados mostram que mais do que um comportamento de risco, as pessoas podem estar numa situação de vulnerabilidade, onde não conseguem aderir à prática de exercícios físicos.

No abstract

The effects of chronic metabolic acidosis (CMA) on zinc (Zn) bone content and urinary excretion were examined in the presence of normal or reduced renal function together with some aspects of calcium (Ca) metabolism. Four groups of rats were compared. All were fed a 30% protein and 9 mg Zn/100 g diet. Two were uremic (U): The first developed acidosis (UA), which was suppressed in the other (UNA) by NaHCO3 supplement. Two other groups had normal renal function: One was normal (CNA), and the other had NH4Cl in the drinking water and acidosis (CA). Femur total Zn and Ca content was markedly reduced by CMA and was not affected by uremia. Zn urinary excretion was increased by CMA and unaltered by uremia. Ca urinary excretion was markedly reduced in uremic rats, but was enhanced in both acidotic conditions. Urinary Ca and Zn showed a strong correlation in uremic and in control rats. Plasma parathormone and 1,25(OH)2D3 were unchanged by CMA. These data are in agreement with a direct primary effect of CMA on bone in releasing buffers. CMA induces bone resorption and a parallel decrease of mineral bone components, such as Ca and Zn, with little or no role of PTH, 1,25(OH)2D3 and of uremia itself.