Does prefrontal cortex transcranial direct current stimulation influence the oxygen uptake at rest and post-exercise?

Area of Science:

• Exercise Physiology
• Neuroscience
• Metabolism

Background:

• Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique.
• The prefrontal cortex plays a role in regulating physiological responses.
• Understanding the interaction between tDCS and exercise metabolism is crucial.

Purpose of the Study:

• To investigate the impact of anodal tDCS on prefrontal cortex on oxygen uptake (V˙ O2) during rest and post-exercise recovery.
• To determine if tDCS influences excess post-exercise oxygen consumption (EPOC) following aerobic exercise.

Main Methods:

• Eleven healthy subjects participated in the study.
• V˙ O2 was measured at rest, during sham or anodal tDCS (2 mA, 20 min), and 30 min post-exercise.
• Isocaloric aerobic exercise (~200 kcal) was performed.

Main Results:

• Anodal tDCS did not alter V˙ O2 at rest or during stimulation compared to baseline or sham.
• Combining anodal tDCS with aerobic exercise significantly increased V˙ O2 during the 30-min recovery period compared to sham.
• Energy expenditure during the EPOC period was approximately 19% higher after anodal tDCS compared to sham.

Conclusions:

• Anodal tDCS applied to the prefrontal cortex, in conjunction with aerobic exercise, enhances EPOC.
• This combination increases V˙ O2 and energy expenditure for at least 30 minutes post-exercise.
• tDCS may be a potential tool to modulate exercise-induced metabolic responses.