Acute physical fatigue (APF) is one of the most common problems related to Multiple Sclerosis (MS), as the perception of fatigue is a very subjective and individual matter which can be different among subjects. Usually water activities are adopted as a healthful treatment to improve MS affected subjects' quality of life, but sometimes not respecting intrasubject variability or exercise capability. The aim of this study was to examine if CRlO scale for rating of perceived exertion (RPE) could be useful to manage with exercise intensity and effort perception in 4 subjects suffering different grades of MS. The results showed that subjects could improve their exercise intensity perception (production of intensities of 3, 6, and 9 grades in CRlO scale) after a three week treatment. Due to the results, it can be argued that RPE can be a useful tool when prescribing exercise intensity with subjects suffering MS.
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