“…20,35,37,42 In 11 studies the confounders age, time since stroke and walking ability/impairment were not explicitly reported. 18,20,26,32,34,[36][37][38][39][40]42 In 12 studies the outcome definitions were not clearly described. 18, 19, 21, 29, 32, 36, 38-41, 43, 44 The authors of 11 studies specified the exact minutes during which the data were acquired for steady-state data-analysis, 13, 19, 21, 23, 30, 33-36, 38, 45 and the authors of only one study reported a definition of steady-state and defined it as a period of at least 3 minutes, during which the variability of heart rate was less than 4 beats/minute.…”