Technique-Specific Load-Velocity Profiling and Prediction Equation for the Back Squat in Elite Portuguese Rugby...

Area of Science:

• Sports Science
• Biomechanics
• Strength and Conditioning

Background:

• Velocity-based training (VBT) is increasingly used to optimize strength and power.
• Accurate prediction of training load is crucial for effective VBT programming.
• The paused parallel back squat is a common exercise, but its load-velocity relationship requires specific investigation.

Purpose of the Study:

• To determine the accuracy of barbell velocity in predicting relative load (%1-RM) during a paused parallel back squat.
• To develop a population-specific prediction equation for elite rugby players.
• To assess the test-retest reliability of the load-velocity relationship in this population.

Main Methods:

• A repeated-measures design was employed with 25 elite Portuguese rugby players.
• An incremental loading protocol up to one-repetition maximum (1-RM) was performed.
• Polynomial regression analysis was used to establish the relationship between mean propulsive velocity (MPV) and %1-RM.

Main Results:

• A strong association was found between MPV and %1-RM (R² = 0.95), with good practical accuracy (SEE = 6.27 %1-RM).
• The load-velocity relationship demonstrated high test-retest stability.
• Elite rugby players exhibited distinct load-velocity profiles compared to other populations.

Conclusions:

• A technique- and population-specific prediction equation for the paused parallel back squat was developed.
• Individualized velocity-based training prescriptions are recommended over generalized equations.
• This provides a practical tool for regulating training intensity in elite rugby players.