title: The acute muscular effects of cycling with and without different degrees of blood flow restriction.
abstract: The aim was to compare the acute effects of work matched high intensity (75% peak aerobic capacity) aerobic exercise to low intensity (40% peak aerobic capacity) aerobic exercise with different degrees of blood flow restriction (BFR) [40% estimated arterial occlusion (40 BFR) and 60% estimated arterial occlusion (60 BFR)] on variables previously hypothesized to be important for muscle adaptation. There were no meaningful changes in torque. Anterior thigh muscle thickness was increased from baseline with high intensity cycling and 40 BFR (~2 mm increase, p ≤ 0.008). A significant increase in lactate occurred in all exercise conditions but was greatest with high intensity cycling (~5.4 mmol/L increase). Muscle activation was significantly higher with high intensity cycling compared to low intensity cycling with BFR, regardless of pressure (~25% vs. ~12% MVC). Mean power frequency was not different between conditions but did increase from the first 5 minutes of exercise to the last 5 minutes (93% vs. 101%, p < 0.001). Ratings of perceived exertion (RPE) were higher with high intensity cycling but discomfort was similar between conditions. We wish to suggest that high intensity cycling produces greater muscular stress than that observed with work matched low intensity cycling in combination with BFR.
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma , Norman , USA.
authors.forename: D
authors.initials: D
authors.lastname: Kim
authors.affiliation: Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, University of Mississippi , P.O. Box 1848, University, MS 38677 , USA.
authors.forename: J P
authors.initials: JP
authors.lastname: Loenneke
authors.affiliation: Department of Kinesiology, Texas Wesleyan University , Fort Worth , USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Thiebaud
authors.affiliation: Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, University of Mississippi , P.O. Box 1848, University, MS 38677 , USA.
authors.forename: T
authors.initials: T
authors.lastname: Abe
authors.affiliation: Department of Health and Exercise Science, University of Oklahoma , Norman , USA.
authors.forename: M G
authors.initials: MG
authors.lastname: Bemben
mesh_terms: D000222:Adaptation, Physiological; D000328:Adult; D001642:Bicycling / Q000502:physiology*; D015444:Exercise; D006801:Humans; D008297:Male; D018482:Muscle, Skeletal / Q000098:blood supply / Q000502:physiology*; D012039:Regional Blood Flow; D055070:Resistance Training; D019415:Torque
keywords: KAATSU; amplitude; hypoxia; muscle hypertrophy; muscle strength; swelling