Upper Limb Movement Performance in Individuals Sustaining Mild Traumatic Brain Injuries.

Area of Science:

• Neuroscience
• Biomechanics
• Rehabilitation Science

Background:

• Mild traumatic brain injury (TBI) often leads to persistent upper limb (UL) functional deficits.
• Task practice intensity, measured by repetitions, is crucial for motor recovery but unknown in mild TBI.
• Kinematic analysis offers a method to quantify movement and estimate necessary practice repetitions.

Purpose of the Study:

• To determine the minimal number of repetitions required for performance plateau in an UL pointing task for individuals with mild TBI.
• To compare motor performance and kinematic variables between individuals with mild TBI and healthy controls.

Main Methods:

• 10 individuals with mild TBI and 7 age-matched controls performed an upper limb pointing task (45 repetitions).
• Kinematic analysis assessed endpoint error, movement speed, straightness, and joint range of motion.
• Clinical assessments evaluated UL motor impairment, spasticity, and activity limitations.

Main Results:

• Individuals with mild TBI required significantly more trials (28.5) to reach performance asymptote compared to controls (18).
• Mild TBI group exhibited more curved movements, increased trunk displacement, and reduced range of motion in wrist, elbow, and shoulder joints.
• Clinical assessments showed no overt motor impairment or activity limitations in the TBI group.

Conclusions:

• Mild TBI results in underlying upper limb movement performance deficiencies.
• Kinematic analysis is essential for detecting subtle motor deficits in mild TBI patients, even with normal clinical scores.
• These findings underscore the importance of objective movement analysis for tailored rehabilitation.