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Figure 3. Individual values of (a) percentage of oxygen consumption reserve (%V̇O2R), (b) percentage of heart rate reserve (%HRR), and (c) metabolic equivalents (METs) of robotic walking during both tested training sessions. Black lines indicate recommended exercise intensity according to American College of Sports Medicine (ACSM) guidelines [31]. Most subjects exercised below this minimum level of exercise intensity. Hoekstra F, van Nunen MP, Gerrits KH, Stolwijk-Swüste JM, Crins MH, Janssen TW. Effect of robotic gait training on cardiorespiratory system in incomplete spinal cord injury. J Rehabil Res Dev. 2013;50(10):1411–22. http://dx.doi.org/10.1682/JRRD.2012.10.0186