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Does Mental Fatigue Negatively Affect Outcomes of Functional Performance Tests?

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Mental fatigue impairs neurocognitive functional performance tests (FPT), specifically reducing accuracy in reactive balance tests. Traditional FPTs were unaffected, highlighting the sensitivity of newer tests to mental fatigue.

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Area of Science:

  • Sports Science
  • Cognitive Neuroscience
  • Human Performance

Background:

  • Mental fatigue is known to degrade psychomotor skills, impacting reaction time, accuracy, and decision-making.
  • Functional performance tests (FPT) are used to assess physical capabilities, with recent developments including neurocognitive FPTs.
  • Understanding the impact of mental fatigue on these different FPT types is crucial for performance optimization and injury prevention.

Purpose of the Study:

  • To investigate the differential effects of induced mental fatigue on traditional and neurocognitive functional performance tests (FPT) in healthy adults.
  • To compare the sensitivity of traditional FPTs versus neurocognitive FPTs to the detrimental effects of mental fatigue.

Main Methods:

  • A randomized counterbalanced crossover design was employed with 14 healthy adult volunteers.
  • Mental fatigue was induced using a 90-minute incongruent Stroop color word test; a control condition involved watching a documentary.
  • Traditional FPTs (single-leg hop, countermovement jump, Y-balance) and a neurocognitive FPT (reactive balance test - RBT) were assessed pre- and post-intervention.

Main Results:

  • Mental fatigue was successfully induced, confirmed by increased self-reported fatigue levels.
  • No significant effects of mental fatigue were observed on traditional FPTs (Y-balance, single-leg hop, countermovement jump).
  • A significant decrease in accuracy was found for the neurocognitive FPT (RBT) under conditions of mental fatigue, while reaction time remained unaffected.

Conclusions:

  • Mental fatigue significantly impairs performance on neurocognitive functional performance tests, specifically affecting accuracy in tasks requiring visual stimulus response.
  • Traditional functional performance tests appear robust and are not significantly affected by the level of mental fatigue induced in this study.
  • Neurocognitive FPTs, such as the RBT, may offer a more sensitive measure of the functional consequences of mental fatigue compared to traditional FPTs.