Cognitive fatigue in traumatic brain injury: a pilot study comparing state and trait fatigue

ABSTRACT

Objective

Cognitive fatigue is a common and disabling symptom following a traumatic brain injury (TBI). Literature on cognitive fatigue has distinguished between two types of fatigue: “state” fatigue refers to the acute experience of fatigue, whereas “trait” fatigue refers to the susceptibility to fatigue over an extended period. However, it is not clear whether state and trait fatigue are distinguishable constructs. Here, we examine the relationship between state and trait fatigue in individuals with TBI, hypothesizing that trait and state measures assess different constructs.

Participants

Twenty-one participants with moderate-severe TBI were recruited.

Design

Participants underwent a cognitively fatiguing task while in an MRI scanner and completed self-report measures examining trait and state fatigue.

Results

No correlation was found between state and trait fatigue. However, the two measures of trait fatigue, Fatigue Severity Scale (FSS) and the Modified Fatigue Impact Scale (MFIS), correlated with one another; additionally only trait fatigue correlated with depression scores, consistent with the literature.

Conclusion

These findings suggest that trait and state fatigue may not be interdependent and that it is important to carefully define the type of fatigue under consideration when assessing fatigue in individuals with TBI.

KEYWORDS:

• Traumatic brain injury
• TBI
• fatigue
• cognitive fatigue
• depression

Acknowledgments

The authors would like to acknowledge grant support from The New Jersey Commission for Brain Injury Research (10.005.BIR1 to GW and HG), and The Kessler Foundation.

Discloser of Interest

The authors report no conflict of interest.