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Related Concept Videos

Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Stress and Mental Health01:30

Stress and Mental Health

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Chronic stress profoundly affects mental health, significantly influencing mood, behavior, and overall quality of life. Research closely links chronic stress with mental health conditions such as depression, anxiety, and substance use disorders. Ongoing exposure to stress can lead to physiological and psychological changes, initiating a cycle of emotional distress and maladaptive coping mechanisms.
Individuals with depression often experience challenges in both their personal and professional...
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Muscle Recovery and Fatigue01:24

Muscle Recovery and Fatigue

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Psychological Responses to Stress01:20

Psychological Responses to Stress

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Psychological responses to stress encompass the various cognitive and emotional reactions individuals experience when faced with challenging or threatening situations, such as a job loss. Prolonged exposure to stressors can disturb emotional balance, increasing negative emotions (e.g., anxiety and sadness) and diminishing positive emotions (e.g., joy and satisfaction). These persistent emotional shifts are associated with an increased risk of both physical illness and mental health issues, such...
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Updated: May 23, 2025

Measuring the Motor Aspect of Cancer-Related Fatigue using a Handheld Dynamometer
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The relationship between performance validity test failure, fatigue, and psychological functioning in Long COVID.

Greta N Minor1, Olivia R Kessler1, Laura Fry1

  • 1Department of Rehabilitation Medicine, University of Minnesota, Minneapolis, MN, USA.

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|March 8, 2025
PubMed
Summary

Long COVID patients

Keywords:
COVID-19Performance validity testsexternal incentivenoncredible performancepsychological assessment

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Area of Science:

  • Neuroscience
  • Psychology
  • Clinical Medicine

Background:

  • Long COVID can impact cognitive function and present with somatic symptoms.
  • Performance validity tests (PVTs) assess the sincerity of cognitive effort.
  • Symptom validity tests (SVTs) are integrated into personality assessments.

Purpose of the Study:

  • To investigate the relationship between self-reported symptoms and performance validity in Long COVID patients.
  • To examine if fatigue (Modified Fatigue Impact Scale) and personality inventory responses (Personality Assessment Inventory) correlate with PVT failures.

Main Methods:

  • 175 Long COVID patients completed four PVTs, the Modified Fatigue Impact Scale (MFIS), and the Personality Assessment Inventory (PAI).
  • Patients were categorized into Pass (no PVT failures), Intermediate (1 PVT failure), and Fail (2+ PVT failures) groups.
  • Medical records were reviewed for 25.71% of participants to verify symptom reporting.

Main Results:

  • 84.57% of participants passed all PVTs, 9.14% were in the Intermediate group, and 6.29% failed 2+ PVTs.
  • No significant differences in external incentive frequency were observed between groups.
  • The Fail group reported slightly greater somatization symptoms (SOM-S) on the PAI compared to the Pass group; the MFIS scores did not differ significantly.

Conclusions:

  • Performance validity failure in Long COVID patients is not strongly associated with fatigue.
  • Except for somatization symptoms, PAI responses do not appear to be significantly linked to PVT performance.
  • Further research is needed to understand the nuances of validity testing in Long COVID populations.