Sex differences in muscle fatigue following isokinetic muscle contractions

Abstract Muscle fatigue is a limiting factor of human performance. It unclear whether sex-based differences in fatigability exist during dynamic exercise varying velocities contraction. We aimed at exploring sex muscle elicited by maximal isokinetic contractions performed different angular velocities. Twenty-six healthy participants (13 men: 23.2 ± 1.5; 13 women: 21.9 3.0 years) were tested for concentric knee-extension slow, moderate and fast velocity (60, 180 300º.s −1 , respectively), on non-consecutive days. The impact resistance consecutive recovery each condition was explored calculating the percent change voluntary isometric contraction (MVIC) rate torque development (RTD), from pre- to post-isokinetic (30 repetitions). index also determined. No obtained response completed 60º.s . After performing women had significantly greater loss MVIC than men (− 18.4 5.5 vs. − 12.9 3.8%; p = 0.009) larger decreases work output 34.2 8.9 vs 27.5 10.6%; 0.017). Recovery initial strength post-exercise 180º.s (15.6 4.1% 6.7 9.5; 0.003). found between sexes any RTD post-fatigue. These results suggest presence sexually dimorphic (isokinetic) favouring higher absolute