Agreements and Discrepancies between the Estimated Walking Distance, Nongraded and Graded Treadmill Testing, and Outside Walking in Patients with Intermittent Claudication

An incremental graded (Gardner-Skinner) treadmill protocol demonstrated the best agreement to outside walking. Discrepancies between treadmill tests and outside walking may be explained by a difference in walking speed. A single determination of a walking distance is a poor reflection of true walking capacity.