A comparison of physiological and perceptual responses to fixed‐power and perceptually regulated cycling with and without blood flow restriction in trained cyclists

This study compared physiological and perceptual responses between cycling prescribed using fixed‐power (PWR) and fixed rating of perceived exertion (RPE), when performed with blood flow restricted (BFR PWR and BFR RPE ) and unrestricted (CON PWR and CON RPE ). Endurance cyclists/triathletes cycled for 10 min in four separate randomized conditions; that is, two methods of prescribed exercise intensity (power at the first ventilatory threshold or RPE matched to CON PWR ) combined with two occlusion levels (with BFR or without). Cardiorespiratory and perceptual variables were recorded every 2 min. Blood lactate concentration was measured pre‐, immediately and 2‐min postexercise. Power output during BFR RPE was lower than CON RPE (−13 ± 13%). The greatest physiological and perceptual responses were achieved during BFR PWR . Heart rate during BFR RPE was not different compared with CON PWR , yet was greater than CON RPE (+4 ± 11%). Muscular discomfort during BFR RPE was greater than CON PWR (+43 ± 18%) and CON RPE (+65 ± 58%). Cuff pain was greater during BFR PWR than BFR RPE (+14 ± 21%). Blood lactate concentration was not different between BFR RPE , CON PWR , and CON RPE at any timepoint. The reduction in power (fixed‐RPE trials; BFR minus unrestricted) correlated with changes in the respiratory rate ( r = 0.85, confidence intervals [CI] = 0.51, 0.96) and postexercise lactate ( r = 0.75, CI = 0.27, 0.93) but not muscular discomfort ( r = 0.18, CI = −0.47, 0.71). Cardiorespiratory and metabolic stress, muscular discomfort, and cuff pain likely mediated self‐regulating fixed‐RPE cycling with BFR. While cycling with BFR at a fixed‐RPE resulted in less physiological stress compared to BFR PWR , it still provided a heightened level of physiological stress, with less pain and discomfort. As such, fixed‐RPE can be a suitable alternative for prescribing BFR to trained cyclists.