Calcium In Women Research Articles

Differences in prevalence and extent of coronary artery calcium detected by ultrafast computed tomography in asymptomatic men and women

Coronary artery calcium is a marker of atherosclerosis in asymptomatic subjects. Ultrafast ® computed tomography (CT) can detect and quantify coronary calcium, simply and noninvasively, with greater sensitivity than can other techniques. The prevalence and extent of coronary calcium in a large population of asymptomatic men and women were measured and compared. Coronary calcium studies were performed in an asymptomatic population of 1,396 male and 502 female subjects (age range 14 to 88 years). The prevalence of calcium, and the distribution of total calcium scores (which reflect the amount of calcium present) were determined and compared for men and women at 5- and 10-year intervals. The prevalence of calcium in women was half that of men, until the age of 60 years when the difference diminished. The mean total calcium score distributions of men between the ages of 40 and 69 years were virtually identical to those of women between the ages of 50 and 79. The quantitative data obtained by Ultrafast CT showed very close agreement with autopsy studies of coronary calcium. Ultrafast CT is a sensitive technique to measure coronary calcium in both men and women. The differences in prevalence and extent of coronary calcium appear to be parallel to those observed in the clinical incidence of coronary artery disease in men and women. Ultrafast CT may have a greater impact on the treatment of women than of men, because it can be used to provide objective evidence of coronary atherosclerosis.

Biological homogeneity and precision of measurement: the boundary conditions for normal in body composition.

For compartments most urgently important to clinical medicine we have satisfactory levels of measurement precision, and the clinical considerations now are the availability of the methods, and the collection of data for normal subjects. Our colleagues in physics and imaging will improve measurement precisions, but the work most needed is to refine the biological side of the measurement equation. Large numbers of measurements, carefully done with carefully calibrated and unchanging systems, exist only for the special case of measuring body calcium in women, in the large cohort of approximately 2,500 women, studied by Aloia and Cohn with neutron activation, and for body potassium, in these women, and in the larger numbers of diverse age, sex, race, and size in the Rosetta study in our laboratory. Can we benefit from the "orthogonal measurements" and "orthogonal physiologic constraints" approaches, in which triangulation is used to combine measurements from several techniques to establish upper-lower bounds estimates by different techniques, with convergence on a "best fit" result? We have noted that the intrinsic homeostatic mechanisms of the body function with great precision to control body temperature, osmotic and ionic concentrations in the water phase, hypertrophy of muscle with exercise, and remodeling of bone by stress. We consider it unlikely that the control mechanisms are more loosely hinged for such secondary parameters as K/FFM and bone density.(ABSTRACT TRUNCATED AT 250 WORDS)

Demographic and nutritional profiles of people consuming varying levels of added sugars

Sociodemographic characteristics and dietary intake of high and low consumers of added sugars, was assessed on a random sample of the Australian adult population using a postal, quantified food frequency approach. People with a higher percentage of energy coming from added sugars in their diet had higher energy and fibre intakes, but lower % energy from fat, complex carbohydrates, protein and alcohol. They also had lower intakes of a range of micronutrients despite having a higher energy intake. However, the form of the relationship between % added sugars and micronutrient intake varied. For some there was a strong linear trend across deciles of added sugars intake with vitamin B6, beta-carotene, folate and magnesium showing the strongest inverse linear trends in both men and women. In women, there was also a strong trend for niacin and weaker but still significant inverse linear trends for retinol, vitamin C, vitamin B12, potassium and zinc. In men, weaker trends were evident for vitamin B12, sodium, calcium and zinc. There were no significant linear trends for thiamine, riboflavin or iron in either sex, nor for retinol, vitamin C or potassium in men and sodium and calcium in women. For some of the micronutrients however, the relationship between % added sugars and micronutrient intake was not strictly linear, with lower nutrient intakes occurring at either end of the % added sugars intake range. High consumers of added sugars were found in all sociodemographic sectors but more particularly so in men and amongst smokers. For women, younger respondents and those in the paid workforce were more likely to be high consumers and, for men, consumption was more likely to be high in those who had never married.

Increasing Women's Calcium Intake: The Role of Health Beliefs, Intentions, and Health Value1

Undergraduate women who varied in how much they valued health were exposed to written communications persuading them of their vulnerability to osteoporosis and of the effectiveness of a recommended action in preventing this disease. Vulnerability had a significant main effect on intentions and subsequent behavior. This effect was obtained regardless of how much the subjects valued their health or whether the coping response was effective. Intentions to perform the recommended behaviors proved to be the best predictors of self‐reported and actual behavior change, in support of the Ajzen‐Fishbein (1980) model. Intentions, in turn, were predicted from recipients' beliefs regarding their ability to perform the behavior, their vulnerability to the health threat, and the effectiveness of the recommended threat‐reducing response. Implications of these findings for health promotion campaigns are discussed.

Calcium in Women's Diets

Calcium in Women's Diets