Sitting idle for long period increases heart failure risk in men even for those who exercise regularly. 'Be more active and sit less. That's the message here' warned the researchers. 'The study is the first to examine the link between heart failure risk and sedentary time' said Deborah Rohm Young lead researcher and a senior scientist at Kaiser Permanente in Pasadena California. To understand the link researchers followed a racially diverse group of 84170 men aged 45 to 69 without heart failure. Exercise levels were calculated in METs (metabolic equivalent of task) - a measure of the body's energy use - while sedentary