Attentional processes and blood lactate levels.

Area of Science:

• Exercise Physiology
• Neuroscience
• Cognitive Psychology

Background:

• High-intensity exercise leads to increased blood lactate.
• Brain lactate uptake rises post-exercise.
• The effect of blood lactate on cognitive functions, particularly attention, remains unclear.

Purpose of the Study:

• To investigate the association between elevated blood lactate levels and attentional performance.
• To examine how induced high blood lactate affects intensity and selectivity of attention.

Main Methods:

• 17 male sprinters underwent maximal cycling exercise to induce high blood lactate.
• Blood lactate levels were measured before, and 5 and 10 minutes after exercise.
• Attentional performance (intensity and selectivity) was assessed using two tasks.
• A subset of participants received intravenous lactate infusion for further investigation.

Main Results:

• An inverse relationship was observed between blood lactate levels and attentional performance scores.
• Higher blood lactate concentrations correlated with poorer performance on both attentional tasks.
• These findings were consistent in both exercise-induced and infusion-induced hyperlactatemia.

Conclusions:

• Elevated blood lactate levels, whether from exercise or infusion, impair cognitive functions related to attention.
• This suggests that lactate accumulation can negatively influence selective and sustained attention capabilities.