Cortical activation pattern during shoulder simple versus vibration exercises: a functional near infrared...

Area of Science:

• Neuroscience
• Exercise Physiology
• Motor Control

Background:

• The cortical impact of exercise remains incompletely understood.
• Functional near-infrared spectroscopy (fNIRS) offers a non-invasive method to study brain activity during physical tasks.

Purpose of the Study:

• To compare the cortical effects of shoulder vibration exercise versus simple shoulder exercise.
• To investigate brain activation patterns using fNIRS.

Main Methods:

• Eight healthy subjects performed two tasks: shoulder vibration exercise and simple shoulder exercise, in a block design.
• Oxygenated hemoglobin levels were measured in the primary sensory-motor cortex (SM1), premotor cortex, supplementary motor area, and prefrontal cortex using fNIRS.
• Analysis focused on SM1 subregions: total, arm somatotopy, and leg/trunk somatotopy.

Main Results:

• Both exercises induced cortical activation across motor and prefrontal areas.
• Higher oxygenated hemoglobin was noted in the arm somatotopy of SM1 for both exercises.
• Shoulder vibration exercise showed significantly greater activation in the leg and trunk somatotopy of SM1 compared to simple exercise.

Conclusions:

• Both shoulder vibration and simple shoulder exercises activate relevant motor cortical areas, especially the arm representation in SM1.
• Shoulder vibration exercise provides an additional cortical activation benefit in the leg and trunk representation of SM1.