![]() ![]() For example, different studies denote the phenomenon of decreased cognitive performance after a period of activity as central fatigue ( Friedman et al., 2007 Kluger et al., 2013), cognitive fatigue ( Bailey et al., 2007 Ackerman and Kanfer, 2009 Wylie and Flashman, 2017), mental fatigue ( Inzlicht et al., 2014), fatigability ( Kluger et al., 2013), cognitive fatigability ( Walker et al., 2019), and ego-depletion ( Baumeister et al., 2018). The sentiment that we need a good and widely accepted set of definitions of fatigue, and related terms, has been echoed by several authors ( Hockey, 2013 Kluger et al., 2013 Pattyn et al., 2018). These definitions will help facilitate communication between different researchers, link phenomena from divergent research fields together, facilitate application and knowledge production, and increase the specificity for hypothesis testing.įatigue is a phenomenon studied in various research fields, such as cognitive neuroscience, exercise physiology, psychology, and the medical sciences. In total, a set of 13 distinct definitions of fatigue and fatigue-related phenomena is presented. Instead, we argue for a set of stipulative definitions, centered around performance measures and subjective estimations, is required in order to maximize clarity. We argue that other existing attempts to unify definitions within fatigue research do not fulfill all of these criteria and desiderata. We first set up two criteria and four desiderata that a definition for interdisciplinary use needs to fulfill: (i) non-circularity, (ii) finiteness, (iii) broadness, (iv) precision, (v) neutrality, and (vi) phenomenon-focus. In this paper, we propose a set of unifying definitions that are useful in all areas of fatigue research while remaining neutral to the various theories about fatigue. 2Department of Pedagogical, Curricular and Professional Studies, Faculty of Education, University of Gothenburg, Gothenburg, Sweden.1Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. ![]() Simon Skau 1* Kristoffer Sundberg 2 Hans-Georg Kuhn 1 ![]()
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