"Association between change in daily ambulatory activity and cardiovascular events in people with impaired glucose tolerance (NAVIGATOR trial): a cohort analysis"
Lancet
http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(13)62061-9/fulltext 
"Interpretation

In individuals at high cardiovascular risk with impaired glucose tolerance, both baseline levels of daily ambulatory activity and change in ambulatory activity display a graded inverse association with the subsequent risk of a cardiovascular event."