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. Author manuscript; available in PMC: 2024 May 1.
Published in final edited form as: Eur J Sport Sci. 2022 May 2;23(5):840–850. doi: 10.1080/17461391.2022.2056520

Figure 2. Quadriceps and Hamstrings Motor Unit Action Potential (MUAP) Peak Amplitude by Group.

Figure 2.

MUAPs are a surrogate for MU size. The linear plots demonstrate the Henneman Size Principle in which smaller units are recruited first, followed by larger units later. Insets) Least Squares Means ANOVA demonstrates significantly lower MUAPs for ACLR Pre-Surg, ACLR 6mo, and ACLR 12mo compared to Controls with the exception of the VM for ACLR 12mo. (* denotes p<0.05; ** denotes p<0.01; *** denotes p<0.001; line shading and error bars denote 95% confidence intervals of the mean.)