Figure 1.
Example time-varying motor unit firing rate curves for the vastus lateralis of one subject during the pre-test.
For this contraction, the algorithm was able to decompose 42 motor units with greater than 92.0% accuracy, but nine have been displayed here for visual clarity. The table and graphs below the mean firing rate plot display the accuracy level, recruitment threshold, mean firing rate, and firing rate at recruitment for each motor unit.
Table 1.
Individual contraction data for the number of motor units decomposed with greater than 92.0% accuracy.
Table 2.
Descriptive statistics for the mean firing rates and firing rates at recruitment for the vastus lateralis and rectus femoris.
Figure 2.
Mean ± SD force steadiness values.
Force steadiness was defined as the coefficient of variation over the ten second constant-force portion of the contraction. During post-testing, the subjects performed trapezoidal isometric contractions at absolute force levels corresponding to 50% of the pre-test MVC, as well as that for the new post-test value.
Table 3.
Means, SDs, 95% confidence intervals (CIs) and ranges for the linear slope coefficients and y-intercepts for the relationships between motor unit mean firing rate versus recruitment threshold for the vastus lateralis and rectus femoris.
Table 4.
Means, SDs, 95% confidence intervals (CIs), and ranges for the linear slope coefficients and y-intercepts for the relationships between motor unit firing rate at recruitment versus recruitment threshold for the vastus lateralis and rectus femoris.