Motor variability regulation analysis in trampolinists

Area of Science:

• Sports Science
• Biomechanics
• Human Movement Analysis

Background:

• Optimizing body orientation in trampolining is crucial for injury prevention and performance.
• Motor variability necessitates anticipatory inflight corrections for body orientation control before landing.

Purpose of the Study:

• Investigate the evolution of body and limb position variability during trampolining acrobatics.
• Examine the relationship between acrobatic difficulty and variability accumulation.
• Identify links between body orientation variability and gaze orientation.

Main Methods:

• Seventeen trampolinists performed up to 13 different acrobatics.
• Kinematics and gaze data captured using inertial measurement units and eye tracking.
• Inter-trial variability of pelvis orientation and limb positions analyzed at takeoff, 75% twist completion, and landing.

Main Results:

• Pelvis orientation variability increased significantly from takeoff to 75% twist completion, then decreased towards landing.
• Limb variability initially decreased, then significantly increased, suggesting kinematic adaptations for orientation control.
• Higher twist rotations correlated with greater variability accumulation at 75% twist completion.
• Qualitative observation linked reduced body orientation variability to visual focus on the trampoline bed before landing.

Conclusions:

• Trampolinists employ limb kinematic adjustments to regulate body orientation, particularly before landing.
• Acrobatic complexity, specifically the number of twists, influences variability accumulation during flight.
• Gaze control may play a role in managing body orientation variability for successful landings.