Archery performance level and repeatability of event-related EMG

Area of Science:

• Sports Science
• Biomechanics
• Motor Control

Background:

• Electromyography (EMG) is crucial for analyzing muscle activity during sports.
• Understanding muscle activation patterns in archery can differentiate skill levels.
• Repeatability of muscle signals is a potential indicator of consistent performance.

Purpose of the Study:

• To compare the repeatability of electromyographic linear envelopes (LE) between skilled archers, beginner archers, and non-archers.
• To investigate the correlation between muscle signal repeatability and archery performance metrics (FITA scores).
• To determine the utility of EMG LE repeatability in assessing archery technique and talent.

Main Methods:

• Surface EMG signals from the musculus flexor digitorum superficialis (MFDS) and extensor digitorum (MED) were recorded from the drawing arm of 23 participants.
• EMG data from 12 shots per participant were processed, including full-wave rectification and a 60 ms moving-average filter.
• Repeatability was quantified using the variance ratio (VR) statistical criterion.

Main Results:

• EMG LEs demonstrated significantly higher repeatability in archers (skilled and beginner) compared to non-archers.
• FITA scores, a measure of archery performance, were significantly correlated with the VRs of MFDS and MED.
• The study found a clear distinction in muscle signal repeatability based on archery experience.

Conclusions:

• The variance ratio (VR) of MFDS and MED electromyographic linear envelopes (LE) can serve as a valuable tool for assessing archery shooting techniques.
• EMG LE repeatability is a potential biomarker for evaluating an archer's progress and identifying talented individuals.
• This research highlights the role of neuromuscular control in archery performance and skill acquisition.