Compensation to whole body active rotation perturbation

Area of Science:

• Human movement science
• Biomechanics
• Neuroscience

Background:

• Understanding human postural control is crucial for preventing falls and optimizing rehabilitation.
• Investigating compensatory mechanisms during dynamic tasks reveals sensorimotor integration strategies.

Purpose of the Study:

• To explore how healthy adults compensate for support surface perturbations during whole body rotations.
• To identify the role of different sensory systems (visual, vestibular, somatosensory) in maintaining stability.

Main Methods:

• Eight healthy participants performed 90° whole body rotations on a rotating platform.
• Three conditions were tested: no platform rotation (NP), and platform rotation in the same (45-S) and opposite (45-O) directions.
• Kinematics and center of pressure (CoP) displacements were recorded using optoelectronic and force platform systems.

Main Results:

• The pelvis was the most perturbed segment, while the head was the least perturbed, especially in the 45-S and 45-O conditions.
• Reduced head perturbation suggests a goal-oriented strategy utilizing visual and vestibular information.
• Tuning of lumbar rotation indicates control mechanisms mediated by somatosensory feedback.

Conclusions:

• Healthy adults employ distinct strategies to maintain stability during perturbed rotations.
• Visual and vestibular systems are key for head stabilization, preserving visual gaze.
• Somatosensory feedback plays a vital role in controlling trunk movements and overall balance.