By AMERICAN HEART ASSOCIATION NEWS

Teen eating salty foods

Lazy weekends can make a difference.

A study presented Wednesday at the American Heart Association’s Epidemiology/Lifestyle 2016 Scientific Sessions said that inactivity seems to influence young adults’ body compositions — especially, when they are sedentary on weekends.

Researchers reported on a study of 332 adults between ages 20 and 35 years for one year. Time spent sedentary was determined using a device that measured inactivity over a 10 day period. Meanwhile, participants themselves reported sedentary behaviors such as time spent sitting, watching TV, and time spent on a computer separately for weekdays and the weekend.

Researchers found that a change in the time spent being sedentary on the weekend was associated with body composition (total measure of fat, bone, water and muscle) and body fat – a 20 min/day reduction in total sedentary time was associated with a reduction of 1 kg (about 2.2 pounds) body weight and 1.6 percent body fat at 1-year follow-up. However, no association was observed at 12 months.

Change in total sedentary time rather than specific sedentary behaviors were associated with change in body composition. Despite being shorter, weekend behavior has strong indications for weight management.