Using markerless motion capture to explore changes in tackle kinematics and load-based tackling technique...

Area of Science:

• Sports Science
• Biomechanics
• Rugby Union Performance Analysis

Background:

• Understanding tackle technique is crucial for injury prevention and performance in rugby.
• PlayerLoad™ and kinematic analysis offer objective measures of physical exertion and movement patterns.

Purpose of the Study:

• To investigate the relationship between tackle technique proficiency, PlayerLoad™, and tackle kinematics.
• To identify biomechanical differences in tackles based on technique scoring.

Main Methods:

• Twenty amateur male rugby players performed simulated tackles using a contact simulator.
• PlayerLoad™ and markerless motion capture were used to collect kinematic data.
• Tackles were categorized into lower, medium, and higher proficiency groups based on specific criteria.

Main Results:

• Higher scoring tackles demonstrated significantly greater shoulder power at the point of contact (27.8 kW) compared to lower scoring tackles (7.9 kW).
• Shoulder force direction differed, with lower technique scores showing force in the opposite direction of the tackle.
• Despite increased power in proficient tackles, overall external loads experienced by the player were comparable across all technique levels.

Conclusions:

• Technically proficient rugby tackles are characterized by higher power output at shoulder contact.
• Effective force application at the point of contact is key to tackle power, not necessarily higher external loads.
• Objective biomechanical analysis can differentiate tackle technique proficiency, informing training strategies.