Abstract
Fatigue is one of the most common symptoms encountered in rehabilitation and during physical therapy interventions. Although this phenomenon is known and experienced by everyone, its assessment is not straightforward. The lack of consensus on its definition, complex etiology, and multidimensional nature means that a large number of outcomes exist and continue to be reviewed. However, it seems essential that its assessment be better defined and standardized to understand the effects of physical therapy. To provide an initial exploratory overview, we conducted a rapid scoping review of the various fatigue assessments used in physiotherapy interventions or performed by physical therapists. A total of 139 articles published between 2020 and July 31, 2025 were included and explored. We found 43 different outcomes used across 46 population groups. While the most well-known chronic conditions such as cancer, multiple sclerosis (MS), and coronavirus disease 2019 (COVID-19) are representative, their assessment methods do not appear to be harmonized. These findings from the study support the idea that fatigue remains a complex phenomenon to assess. However, it appears that the lack of justification for the choice of an outcome prevents a better understanding of the reproducible effects on fatigue in physiotherapy interventions.