A Comparative Study of Activity and Dual Sensor: Activity and Minute Ventilation Pacing Responses to Ascending and Descending Stairs. - Alt, Eckhard; Combs, William; Willhaus, Richard; Condie, Catherine; Bambl, Erwin; Fotuhi, Parwis; Pache, Jürgen; Schömig, Albert (Pacing & Clinical Electrophysiology, 1998)