Micha Neumann1, Annette Sterr2, Dolores Claros-Salinas3, Rolf Gütler1, Rolf Ulrich4, Christian Dettmers5. 1. Kliniken Schmieder Konstanz, Konstanz, Germany. 2. University of Surrey, Guildford, UK. 3. Kliniken Schmieder Konstanz, Konstanz, Germany; Lurija Institute, Kliniken Schmieder Allensbach, Allensbach, Germany. 4. Department of Psychology, University of Tübingen, Tübingen, Germany. 5. Kliniken Schmieder Konstanz, Konstanz, Germany; Lurija Institute, Kliniken Schmieder Allensbach, Allensbach, Germany; Department of Psychology, University Konstanz, Konstanz, Germany. Electronic address: c.dettmers@kliniken-schmieder.de.
Abstract
OBJECTIVE: This study used reaction time (RT) as an objective marker of cognitive fatigue and fatigability in patients with multiple sclerosis (MS). METHOD: RT was measured in fifteen healthy controls and in thirty MS patients with cognitive fatigue identified with the Fatigue Scale for Motor and Cognitive Function (FSMC). Secondary fatigue was excluded through the Epworth Sleepiness Scale and the Beck Depression Inventory. RT was measured at rest (t1), following a 2.5 hour test session inducing high cognitive load (t2), and a one hour recovery period (t3). RESULTS: At rest mean RT was longer in patients than in controls (391 ms vs 205 ms). After exerting cognitive load (t2), RT in patients increased dramatically but remained unchanged in controls. After the recovery period (t3), RT returned to baseline levels in most patients. Patients further showed a significant correlation between RT and FMSC scores at t1, t2 and t3. CONCLUSION: RT performance is a suitable surrogate marker for assessing fatigue. RT is sensitive to cognitive load and the recovery from cognitive demand. It hence represents an objective index for fatigability which can inform the management and treatment of MS.
OBJECTIVE: This study used reaction time (RT) as an objective marker of cognitive fatigue and fatigability in patients with multiple sclerosis (MS). METHOD: RT was measured in fifteen healthy controls and in thirty MS patients with cognitive fatigue identified with the Fatigue Scale for Motor and Cognitive Function (FSMC). Secondary fatigue was excluded through the Epworth Sleepiness Scale and the Beck Depression Inventory. RT was measured at rest (t1), following a 2.5 hour test session inducing high cognitive load (t2), and a one hour recovery period (t3). RESULTS: At rest mean RT was longer in patients than in controls (391 ms vs 205 ms). After exerting cognitive load (t2), RT in patients increased dramatically but remained unchanged in controls. After the recovery period (t3), RT returned to baseline levels in most patients. Patients further showed a significant correlation between RT and FMSC scores at t1, t2 and t3. CONCLUSION: RT performance is a suitable surrogate marker for assessing fatigue. RT is sensitive to cognitive load and the recovery from cognitive demand. It hence represents an objective index for fatigability which can inform the management and treatment of MS.
Authors: Clara Vila-Castelar; Jenny J Ly; Lillian Kaplan; Kathleen Van Dyk; Jeffrey T Berger; Lucy O Macina; Jennifer L Stewart; Nancy S Foldi Journal: Arch Clin Neuropsychol Date: 2019-05-01 Impact factor: 2.813
Authors: Chiara Baglioni; Christoph Nissen; Adrian Schweinoch; Dieter Riemann; Kai Spiegelhalder; Mathias Berger; Cornelius Weiller; Annette Sterr Journal: PLoS One Date: 2016-03-07 Impact factor: 3.240