Understanding Mental Fatigue After Stroke

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Fatigue is reported by stroke survivors as a highly problematic and persisting experience with many rating it as their most severe amongst all post - stroke sequelae. Given the negative impact of fatigue on participation, an investigation into the possible underlying mechanisms mediating fatigue aft...

Fatigue is reported by stroke survivors as a highly problematic and persisting experience with many rating it as their most severe amongst all post - stroke sequelae. Given the negative impact of fatigue on participation, an investigation into the possible underlying mechanisms mediating fatigue after stroke has clinical implications. Recent studies indicate that an impairment in the domain of attention is related to the experience of higher fatigue levels. However, the complexity of this mechanism, presentation and measurement have made the findings unclear. In studies, testing methods to identify a dysfunction in the domain of attention can be mentally fatiguing. Moreover, it is not clear whether the impact of contextual factors on concentration levels, such as background noise and distraction, has been considered. Primary Objective: Among people with stroke engaging in a task requiring sustained attention, to what extent does the use of noise-cancelling earphones impact on mental fatigue? Fatigue will be assessed using two measures: 1) The Continuous Performance Test, a reaction time based assessment completed on a computer tablet and 2) A Visual Analog Scale for Fatigue, which is paper based. Design: A cross - over repeated exposure randomised design will be used. Study participants will be randomised to do tasks of sustained attention, followed by a reaction time based assessment on a tablet, first with and then without earphones or first without and then with earphones. The two assessment sessions will be done one week apart to allow for a washout period. Participants will be invited to rank their fatigue levels on a visual analog scale, pre - post these assessments. Secondary Objectives: Is baseline cognitive fatigue a predictor for performance decrement on tasks of sustained attention? This will be assessed using the Fatigue Scale for Motor and Cognitive Functions (FSMC). This scale includes both physical and cognitive aspects of fatigue. What are the contextual factors mediating fatigue symptoms? This will be assessed using a momentary ecological assessment application on a mobile phone or a diary paper based assessment. What is the influence of fatigue symptoms on participatory patterns as seen on the ecological momentary app or diary? This will be assessed with a wrist worn Accelerometer.

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