Blood flow restriction attenuates surface mechanomyography lateral and longitudinal, but not transverse oscillations during fatiguing exercise.

The absolute sMMG-X amplitude responses were attenuated with the application of BFR (mean±SD= 0.236±0.138m·s-2) relative to non-BFR (0.366±0.199m·s-2, collapsed across Time) and for sMMG-Y amplitude at 60-100% of TTE (BFR range=0.213-0.232m·s-2 vs. non-BFR=0.313-0.445m·s-2). Normalizing sMMG to pretest MVIC removed most, but not all the attenuation which was still evident for sMMG-Y amplitude at 100% of TTE between BFR (72.9±47.2%) and non-BFR (98.9±53.1%). Interestingly, sMMG-Z amplitude was not affected by the application of BFR and progressively decreased across %TTE (0.332±0.167m·s-2 to 0.219±0.104m·s-2, collapsed across Condition.) Significance. The application of BFR attenuated sMMG-X and sMMG-Y amplitude, although normalizing sMMG removed most of this attenuation. Unlike the X- and Y-axes, sMMG-Z amplitude was not affected by BFR and progressively decreased across each exercise bout potentially tracking the development of muscle fatigue.