Beta band activity (13–30 Hz) is projected from the cortex to motor neurons and therefore to muscles. This transmission occurs primarily through the fastest corticospinal fibres. However, it is currently unknown whether this projection is uniform across all motor neurons innervating the same muscle. In this study, 12 subjects performed ankle dorsiflexion contractions while electroencephalography and high-density electromyography of the tibialis anterior muscle were recorded. Corticomuscular coherence was computed for increasing contraction force levels, which engaged motor units of progressively greater sizes. Beta band seemed to be uniformly transmitted to the muscle, as the average coherence did not significantly change across different force contractions. This suggests that beta oscillations project similarly to this muscle independently to the size of the motor neurons transmitting it.