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Moderate-intensity exercise-induced changes in lactate do not predict changes in corticospinal excitability.

Cassidy Klein1,2, Jess Gibson1,3, Hayley N Pettigrew1,4

  • 1Laboratory for Brain Recovery and Function, Dalhousie University, Halifax, NS B3H 4R1, Canada.

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
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Summary
This summary is machine-generated.

Moderate aerobic exercise enhances corticospinal excitability (CSE), but this study found lactate accumulation does not drive this effect. Lactate levels did not predict changes in CSE after exercise, suggesting other mechanisms are at play.

Keywords:
aerobic exercisecorticospinal excitabilitylactateneurophysiologytranscranial magnetic stimulation

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Area of Science:

  • Exercise Physiology
  • Neuroscience
  • Motor Control

Background:

  • Aerobic exercise is known to increase corticospinal excitability (CSE), potentially facilitating motor learning.
  • Lactate accumulation during exercise has been hypothesized as a key mediator of CSE changes.
  • Previous research primarily examined lactate's role in maximal or fatiguing exercise, leaving its effect during steady-state moderate-intensity exercise unexplored.

Purpose of the Study:

  • To investigate the relationship between blood lactate concentration and exercise-induced changes in CSE during moderate-intensity exercise.
  • To determine if lactate accumulation is the primary mechanism driving enhanced CSE after steady-state aerobic exercise.

Main Methods:

  • Twenty-four healthy participants completed two sessions: a maximal graded exercise test and a 20-minute moderate-intensity cycling session (60% peak power output).
  • Corticospinal excitability (CSE) of the first dorsal interosseous muscle was measured using transcranial magnetic stimulation (TMS) pre-exercise, immediately post-exercise, and 10 minutes post-exercise.
  • Blood lactate levels were measured at the same timepoints as CSE assessments.

Main Results:

  • Linear regression analysis revealed no significant association between blood lactate concentration and exercise-induced changes in CSE.
  • Lactate levels did not predict CSE changes immediately following exercise (R² = 0.02184, p = 0.4907).
  • Lactate levels also did not predict CSE changes 10 minutes post-exercise (R² = 0.02121, p = 0.4971).

Conclusions:

  • Blood lactate concentration does not appear to be the primary mechanism responsible for the observed increases in CSE following moderate-intensity aerobic exercise.
  • These findings suggest that other physiological factors mediate the enhancement of corticospinal excitability during steady-state, moderate exercise.