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Excessive accumulation of fat in the abdominal region is already an indicator of known risk of cardiovascular disease. According to the World Health Organization (WHO), the measurement should not exceed 94 cm (cm) in men and 90 cm in women. A new study, developed by researchers at the University of São Paulo (Unesp), has however revealed that physically active and non-overweight people whose waist height values near the risk limit were also more likely to develop disorders in the heart.
The CER is obtained by dividing the waist circumference by the height. "Until then, values higher than 0.5 indicated a high risk of developing certain cardiovascular or metabolic diseases, values of less than 0.5 indicated that the person was apparently at a lower risk," explained Vitor Engrácia Valenti, professor at the Unesp de Marília and coordinator of the research. For this study, 52 healthy, physically active men aged 18 to 30 were selected
According to Valenti, recent studies suggest that the CER provides more accurate information about cardiovascular risks than the mbad index body (BMI). which evaluates the distribution of fat by the body. "The result we find attracts the attention of those who think [estão fora dos grupos de risco] not to have a stomach, but do not do physical activity or maintain a healthy diet."
L & # 39; The study, which is supported by the Foundation for Research Support of the State of São Paulo (FAPESP), was conducted in collaboration with Oxford Brookes University, England, and published in the journal Scientific Reports
Evaluation
The study participants were divided into three groups: the first group, consisting of men with a lower percentage of body fat and an ECR between 0.40 and 0.449; the second, consisting of men with CERs between 0.45 and 0.50, close to the risk threshold; and the third, among men with CERs above the risk limit, between 0.5 and 0.56. "We badessed the physiological parameters of the autonomic nervous system by the heart rate before and for one hour after resuming exercise," explained Valenti.
They were evaluated for two days. During the first exercise, the participants had to sit for 15 minutes at rest, then fully exercise in the treadmill. The goal was to discover that everyone was physically active. Although they are not athletes, they have maintained regular activities. Then they should rest for 60 minutes
On the second day, they underwent moderate physical exercise: a 30-minute walk on a treadmill. The intensity would be about 60% of the maximum effort. The intention was to observe, during the rest and the first hour after the exercises, the speed of autonomous cardiac recovery. "The longer the body takes a long time to recover from physical exertion, it indicates that the person is more likely to develop cardiovascular diseases, such as hypertension, stroke, stroke," said the researcher.
The results showed that groups with CERs close to and above the risk limit for developing heart disease exhibited slower autonomic recovery in both maximal and moderate effort. "Even healthy and physically active people, who were neither overweight nor obese but who had normality values closer to risk values, were at a higher risk than those with individuals whose waist circumference and stature were smaller ",
The researcher explained that it was an initial study, but with" strong evidence "of the need to revise the reference values. "Let us now leave the idea that this is done in other countries, with another population, in other conditions, here we check in the Brazilian population, if we think about the population of China, Japan, has a different culture and customs, we can not generalize based solely on the results of the Brazilians. "
Obesity
Obesity is considered by the WHO as a global epidemic. An estimated 1.9 billion adults are overweight, of whom 600 million are obese. In Brazil, the surveillance of risk factors and the protection of chronic diseases by telephone survey (Vigitel) of the Ministry of Health in 2017 showed that 18.9% of Brazilians are obese. In addition, more than half of the population of Brazilian capitals (54%) is overweight.
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