In metal music, double bass drumming pushes human movement to its limits. The ankle technique relies on rapid, cyclical flexion and extension of the ankle to enable trained musicians to reach frequencies of 5–10 strikes per second (Hz) per leg—exceptional frequencies for the lower limbs. These movements resemble physiological ankle tremor, a reflex-driven phenomenon well documented in neurophysiology. However, little research exists on the associated biomechanics. Many drummers report lower limb and back pain, raising concerns that sustained use of the ankle technique could contribute to musculoskeletal disorders (MSDs).

We studied 18 experienced drummers (mean age: 34 years) with at least five years of mastery of the ankle technique. We measured their lower limb and trunk positions, recorded electrical activity in seven muscles—including those responsible for ankle flexion/extension and others commonly associated with pain—and assessed performance endurance. Drummers performed short, metronome-guided trials at varying speeds and a longer endurance trial.

Results showed ankle oscillation frequencies from 4.6 Hz to 8.7 Hz, with amplitudes averaging 8.5°. Muscle activation durations in the soleus (calf muscle; mean: 56.2 ms) and tibialis anterior (shin muscle; mean: 52.7 ms) aligned with physiological tremors and adapted to frequency variations. Some drummers exhibited excessive muscle activation (>30% of maximal voluntary activation), particularly in the lower back and hip flexors, suggesting potential strain. Those who performed best in endurance had lower overall muscle activation, hinting at a more efficient technique.

These findings confirm that the ankle technique exploits a physiological tremor refined through training. However, compensatory muscle activation may increase MSD risk. This work bridges motor control research and real-world musical performance, providing evidence-based insights to refine technique, improve endurance, and reduce MSD risk.