RT Journal Article SR Electronic T1 Review: regular brisk walking improves cardiovascular risk factors in healthy sedentary adults JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 171 OP 171 DO 10.1136/ebm.12.6.171 VO 12 IS 6 YR 2007 UL http://ebm.bmj.com/content/12/6/171.abstract AB