Overweight adolescents face the same increased risk of developing heart disorders as their obese counterparts, a conclusion that contradicts the popular idea that the heavier a person is, the higher their cardiovascular risk, reports a new study. The findings of the study are published in the journal Cardiology in the Young.
The results of cardiovascular fitness tests with volunteers aged 10-17 were similar in both groups.
Childhood Obesity
Childhood obesity is one of the most serious health challenges in the developing countries and needs to be understood and tackled effectively.
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‘Overweight teens have the same predisposition or vulnerability as that of obese teens to cardiovascular diseases such as hypertension and heart failure.’
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"Until recently, overweight in adolescence wasn't considered as important risk as obesity for the development of the cardiovascular disease. We found the risks to be similar in both cases," Vitor Engrácia Valenti told. Valenti is a professor at the UNESP campus in Marília and was the principal investigator for the project.
The researchers divided 40 adolescents aged between 10 and 17 into two groups, each with ten boys and ten girls: an overweight group with BMI-for-age Z-scores of +1 or +2 and an obese group with Z-scores above +2.
BMI is body mass index (the ratio of weight to height). Z-scores indicate the number of standard deviations below or above the population mean.
![Diet Guidelines for Healthy Snacking]( "Diet Guidelines for Healthy Snacking")
Due to busy lifestyles, food holds the least amount of importance for many of us. Healthy snacking is not as simple as it sounds. It involves thorough understanding of what, when and how to eat.
The participants performed a moderate exercise protocol, which involved walking on a treadmill at a slope of 0% and required 70% of the maximum estimated heart rate for this age group.
Heart rate variability was measured before and after the exercise session to assess the speed of autonomic cardiac function recovery. Prolonged autonomic nervous system imbalances after physical exertion have been shown to increase the risk of an acute event and future cardiovascular disease.
During the first few seconds of an exercise session, the parasympathetic nervous system decelerates cardiac function. One of the two main divisions of the autonomic nervous system, this system conserves energy by slowing the heart rate and relaxing the body in other ways. After 50-60 seconds, the sympathetic nervous system kicks in, stimulating activity such as increased heart rate via adrenalin release, that prepares the body to react to a stressful situation.
According to Valenti, studies published in recent years have shown that the longer after a period of exertion the autonomic nervous system takes to stabilize, so that heart rate returns to normal, the greater the risk of cardiovascular or metabolic disease.
The researchers found no significant difference in heart rate variability between overweight and obese adolescents or between girls and boys.
"The mean autonomic nervous system variables were practically identical for both groups regardless of sex," Valenti said.
"These findings suggest that overweight adolescents have the same predisposition or vulnerability as that of obese adolescents to cardiovascular diseases such as hypertension and heart failure, as well as to metabolic disorders such as diabetes, dyslipidemia, and high levels of triglycerides and LDL cholesterol."
The number of obese adolescents worldwide has risen sharply in the last 40 years. According to recent studies, the proportion increased between 30% and 50% per decade in developed countries in Brazil, and the prospects are the same.
Source: Eurekalert
Diet Guidelines for Healthy Snacking
Due to busy lifestyles, food holds the least amount of importance for many of us. Healthy snacking is not as simple as it sounds. It involves thorough understanding of what, when and how to eat.
Advertisement
The participants performed a moderate exercise protocol, which involved walking on a treadmill at a slope of 0% and required 70% of the maximum estimated heart rate for this age group.
Heart rate variability was measured before and after the exercise session to assess the speed of autonomic cardiac function recovery. Prolonged autonomic nervous system imbalances after physical exertion have been shown to increase the risk of an acute event and future cardiovascular disease.
During the first few seconds of an exercise session, the parasympathetic nervous system decelerates cardiac function. One of the two main divisions of the autonomic nervous system, this system conserves energy by slowing the heart rate and relaxing the body in other ways. After 50-60 seconds, the sympathetic nervous system kicks in, stimulating activity such as increased heart rate via adrenalin release, that prepares the body to react to a stressful situation.
According to Valenti, studies published in recent years have shown that the longer after a period of exertion the autonomic nervous system takes to stabilize, so that heart rate returns to normal, the greater the risk of cardiovascular or metabolic disease.
The researchers found no significant difference in heart rate variability between overweight and obese adolescents or between girls and boys.
"The mean autonomic nervous system variables were practically identical for both groups regardless of sex," Valenti said.
"These findings suggest that overweight adolescents have the same predisposition or vulnerability as that of obese adolescents to cardiovascular diseases such as hypertension and heart failure, as well as to metabolic disorders such as diabetes, dyslipidemia, and high levels of triglycerides and LDL cholesterol."
The number of obese adolescents worldwide has risen sharply in the last 40 years. According to recent studies, the proportion increased between 30% and 50% per decade in developed countries in Brazil, and the prospects are the same.
Source: Eurekalert
Obesity during Pregnancy: Know the Risks
Women with a body mass index >30 are obese and are at a higher risk for gestational diabetes during pregnancy. Macrosomia and birth defects are risks seen in the babies.
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 Being Young and Overweight May Change Your Heart FunctionBeing overweight or having a higher BMI at a young age may cause hypertension and changes in the structure and functions of the heart which may increase the risk of heart disease in later life. | Advertisement
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