Amsterdam Rehabilitation Research Center, Reade 1 article published in JoVE Medicine Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion Rick de Klerk1, Riemer J. K. Vegter1, Marika T. Leving1, Sonja de Groot1,2, DirkJan H. E. J. Veeger3,4, Lucas H. V. van der Woude1,5 1Center for Human Movement Sciences, University Medical Center Groningen, 2Amsterdam Rehabilitation Research Center Reade, Amsterdam, 3Research Institute MOVE, Faculty of Behavioral and Human Movement Sciences, VU University, 43M, Delft University of Technology, Delft, 5Center for Rehabilitation, University Medical Center Groningen Accurate and standardized assessment of external power output is crucial in the evaluation of physiological, biomechanical, and perceived stress, strain, and capacity in manual wheelchair propulsion. The current article presents various methods to determine and control power output during wheelchair propulsion studies in the laboratory and beyond.