Inactivity during childhood could be associated with heart enlargement, new research has revealed, a condition which could worsen if a person remained inactive in the long run.
Increase in heart mass and size, known as left ventricular hypetrophy, is a known risk factor for heart attacks, stroke and premature death in adults.
Light physical activity of about three or four hours a day, including running errands and playing outdoor games, was found to reverse the increase in heart mass.
Cardiac function improved with more activity.
There is growing evidence that sedentary children are likely to have health problems and it "needs to be taken seriously," says Andrew Agbaje, a physician and an associate professor of clinical epidemiology and child health at the University of Eastern Finland.
The author of the study which has been published in the European Journal of Preventive Cardiology, said, "There must be a paradigm shift in how we view childhood sedentariness, as the mounting evidence is pointing at a ticking time bomb."
For the study, the researchers followed nearly 1,700 children from the UK's University of Bristol's 'Children of the 90s cohort' from age 11 until 24 years. At the start of the study, the children spent about six hours a day performing sedentary activities, which increased to nine hours a day as they became young adults, a PTI report said.
Wearing accelerometer devices (for tracking movement) on their waists at ages 11, 15, and 24 years for a duration of 4-7 days, the participants had echocardiography measurements taken of their heart structure and function at ages 17 and 24 years.
Lifestyle factors and socio-economic status were also analysed, along with fasting blood samples for cholesterol, glucose, insulin and C-reactive protein, which is an indicator of inflammation.
The researchers found that over a period of seven years, during which the adolescents grew into young adults, the heart enlargement associated with the increase in sedentary time contributed 40 per cent to the total increase in heart mass.
Being sedentary or inactive was found to increase heart mass, regardless of obesity or elevated blood pressure status.
The team also found that light physical activity over the entire follow-up period reduced the increase in heart mass by about half.
"Light physical activity is an effective antidote to sedentariness. It is easy to accumulate three to four hours of physical movement daily.
"Examples of light physical activity are outdoor games, playing in the playground, walking a dog, running errands for parents, walking and biking to the shopping mall or to school, taking a stroll in the park, playing in the forest, gardening, casual basketball, soccer, floorball, golf, frisbee, etc. We can encourage children and adolescents to participate in light physical activity daily for better cardiovascular health," Agbaje said.
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