Which frequencies can be recorded from within a skeletal muscle fiber?

The correct choice indicates that frequencies between 2 and 10,000 Hz can be recorded from within a skeletal muscle fiber. This range encompasses not only the low frequencies associated with basic muscle activity and motor unit firing patterns but also higher frequencies that may reflect more complex muscle contractions and electrical activity.

Skeletal muscles generate electrical signals primarily through the action potentials of motor units, which, when activated, can create frequency patterns in this broad range. The low-frequency portion, from 2 to 10 Hz, is particularly relevant for capturing basic muscle contractions and underlying physiological processes. Meanwhile, the higher frequencies extend to 10,000 Hz, which can include the rapid firing rates of muscle fibers during vigorous or sustained activity.

This broad range is important for biofeedback and electromyography (EMG) applications, as it allows practitioners to assess various levels of muscular activation and how these relate to overall performance and muscle health. The ability to capture such a wide spectrum of frequencies enables a more comprehensive analysis of muscular function and contributes to effective biofeedback practices.