Motor variability regulation analysis in trampolinists
DOI:
https://doi.org/10.51224/SRXIV.432Keywords:
variability regulation, motor control, twisting somersaults, aerial acrobatics, sensory acquisitionAbstract
In trampolining, optimizing body orientation during landing reduces injury risk and enhances performance. As athletes are subject to motor variability, anticipatory inflight corrections are necessary to regulate their body orientation before landing. This study first investigated the evolution of body orientation and limb position variability during twisting somersaults of various difficulties. A secondary objective was to examine the link between acrobatics difficulty and the variability accumulation and to identify links between body orientation variability and gaze orientation. Kinematics and gaze orientation were captured using inertial measurement units and a portable eye tracker, respectively. Seventeen trampolinists performed up to 13 different acrobatics. Pelvis orientation and limb positions inter-trial variability was computed at three key timestamps: take-off, 75% completion of the twist for the most twisting somersault, and landing. Pelvis orientation variability significantly increased (+75%) and then decreased (-39%) while there was an opposite pattern for the limbs where variability decreased (upper limbs:
-66% and lower limbs: -46%) and increased (+357% and +127%), suggesting that trampolinists adapted their limb kinematics to regulate pelvis orientation before landing. A decreased body orientation variability was observed when athletes looked at the trampoline bed before landing. Thus, coaches should ensure that the acrobatic technique allows for getting the appropriate visual information to facilitate landings. Moreover, there was a moderate correlation between the number of twists in a straight somersault and the variability accumulation at 75% of the twist, highlighting that athletes accumulate more variability as the number of twist rotations increases.
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Copyright (c) 2024 Eve Charbonneau, Mathieu Bourgeois, Craig Turner, Mickaël Begon (Author)
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