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- W4236022857 abstract "1892 PURPOSE: To determine if the fatigability of the quadriceps femoris varies by biological sex under ischemic and perfused conditions; and 2) to determine if differences in neuromuscular activation patterns (NMAP) exist. METHODS: Young males and females (n = 11/group; ages 20–39 years) performed a sustained contraction at 25% of maximal force under conditions of ischemia (ISCH) and normal muscle blood flow (NON-ISCH). For the NON-ISCH condition electromyographic (EMG) activity was recorded from the vastus lateralis (VL), rectus femoris (RF), vastus medialis (VM) and biceps femoris (BF) muscles, and analyzed for fatigue-induced changes in the amplitude (RMS EMG) and bursting activity (transient changes in motor unit recruitment) of the signal. Additionally, torque fluctuations (tremor) were quantified as an indirect measure of excitatory drive. RESULTS: Females had a longer endurance time during NON-ISCH (214.9 ± 20.5 s vs 169.1 ± 20.5 s, p = 0.02), but not during ISCH (179.6 + 19.6 v s 165.2 ± 19.6 s). EMG data demonstrated fatigueinduced sex differences in the NMAP of the RF. The most noticeable differences were the males failing to recruit the RF as the fatiguing contraction progressed and females achieving a greater relative activation (p<0.05). Additionally, during the NON-ISCH condition females exhibited a greater tremor during the last-third of the contraction (6.17 ± 0.57% vs. 4.26 ± 0.60%, p<0.00), and had a tendency for increased bursting activity (P = 0.08). CONCLUSIONS: Sex differences in intramuscular blood flow and/or muscle metabolism are in part responsible for the female advantage in fatigue-resistance. Additionally, fatigue-induced sex differences were observed in the NMAP of the quadriceps femoris. These findings suggest there are fatigue-induced sex differences in supraspinal descending drive, and/or excitability of the human neuromuscular system." @default.
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- W4236022857 date "2004-05-01" @default.
- W4236022857 modified "2023-09-27" @default.
- W4236022857 title "Sex Differences in Muscle Fatigability and Neuromuscular Activation Patterns of the Human Quadriceps Femoris" @default.
- W4236022857 doi "https://doi.org/10.1249/00005768-200405001-01328" @default.
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