Researchers have found that limiting television viewing to one hour a day may reduce the risk of heart attacks, strokes, and other blood vessel diseases collectively known as atherosclerotic cardiovascular disease,ASCVD.
The study, published in the Journal of the American Heart Association, highlights the potential dangers of prolonged TV time, especially for individuals with a genetic predisposition to Type 2 diabetes.
Led by Mengyao Wang, the research team comprised experts from the School of Public Health at the University of Hong Kong and the Institute of Metabolic Science at the University of Cambridge.
The study examined data from 346,916 white British individuals enrolled in the UK Biobank, assessing their genetic risk for Type 2 diabetes and self-reported television viewing habits.
Findings showed that 21 percent of participants watched TV for an hour or less daily, while 79 percent spent two or more hours in front of the screen.
Those who exceeded one hour of TV viewing per day faced a 12 percent higher risk of developing ASCVD, regardless of their genetic susceptibility to Type 2 diabetes.
However, individuals with a medium to high genetic risk of diabetes who restricted their TV time to one hour or less did not experience an increased risk of cardiovascular complications.
Atherosclerotic cardiovascular disease occurs when plaque builds up inside the arteries, leading to conditions such as heart disease, stroke, and peripheral artery disease.
Peripheral artery disease, in particular, restricts blood flow to the arms and legs, potentially causing severe health complications. If left unmanaged, these conditions may result in reduced quality of life, surgical interventions, amputations, or even premature death.
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Damon Swift, Chair of the American Heart Association’s Physical Activity Committee and an associate professor at the University of Virginia, emphasized the importance of reducing sitting time for overall health.
He noted that people with Type 2 diabetes face a significantly higher risk of cardiovascular disease than those without the condition.
Introducing targeted interventions for individuals who spend extended periods sitting at home or work could help mitigate these risks and promote better health outcomes.
The study used a weighted polygenic risk score, which assesses an individual’s genetic likelihood of developing Type 2 diabetes based on 138 genetic variants.
Researchers categorized participants’ TV habits into two groups: those watching less than one hour a day and those watching more than two hours daily. By comparing these groups, they uncovered a clear link between prolonged screen time and cardiovascular health risks.
Despite the significant findings, researchers acknowledged certain limitations in their study. One concern was the reliance on self-reported TV viewing time, which could introduce reporting biases.
Some participants might have underestimated their TV-watching hours due to social desirability or inaccurate recall.
Nevertheless, the study reinforces growing evidence that reducing sedentary behavior could serve as a crucial intervention in preventing cardiovascular diseases.
Experts suggest that incorporating more physical activity into daily routines, alongside minimizing prolonged sitting, could significantly improve heart health, especially for those at higher risk of diabetes-related complications.
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