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Too much sitting has been linked to increased risk for health problems such as heart failure and earlier death. Now, a new study finds older adults who sit too much are more likely to be disabled -- regardless of their exercise habits."Sedentary behavior is its own separate risk factor [for disability]," said study researcher Dorothy Dunlop, a professor of medicine at the Northwestern University's Feinberg School of Medicine. She evaluated the exercise habits of more than 2,000 men and women, ag …