Influence of dual-task on postexercise facilitation: a transcranial magnetic stimulation study

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Neuroscience

Background:

• Postexercise facilitation (PEF) is a measure of motor cortex plasticity.
• Transcranial magnetic stimulation (TMS) is used to assess corticospinal excitability.
• The impact of dual-tasking on PEF is not fully understood.

Purpose of the Study:

• To investigate the effect of a dual task (DT) on postexercise facilitation (PEF).
• To examine the influence of concurrent motor and cognitive tasks on motor evoked potentials (MEPs).

Main Methods:

• Twelve healthy subjects performed a nonfatiguing leg extension task, a calculation task, and a dual task.
• Motor evoked potentials (MEPs) were measured using TMS before and after each task.
• Stimulation targeted the vastus lateralis (VL) and tibialis anterior (TA) muscles.

Main Results:

• Exercise alone induced significant PEF in both VL and TA muscles.
• The calculation task alone did not result in significant PEF.
• The dual task condition showed a lack of significant PEF in both muscles, indicating interference.

Conclusions:

• Dual-tasking interferes with corticospinal excitability following nonfatiguing exercise.
• This finding has implications for understanding motor cortex adaptations in various populations.
• The experimental paradigm can be used to study motor and cognitive task complexity's impact on plasticity.