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patients fibromyalgia exercise education recommended decrease pain level improve pain management latest scientific evidence recommends focus interventions upper limb aim pilot study compare immediate effect physical activity education vs control group pain muscle capacity fibromyalgia patients fiftysix participants fibromyalgia randomized experimental group control group intervention consisted watching fiveminute video provided information fibromyalgia pain kinesiophobia physical activity control group watched neutral fiveminute video beavers quebec following video participants performed muscular fatigue task consisting repeated unilateral shoulder abduction task baseline following muscular fatigue task maximal voluntary contraction mvc shoulder abduction assessed well pain level pressure pain threshold ppt upper limb electromyographic activity also assessed upper trapezius middle deltoid muscles twoway repeated measures analysis variance used compare mvc ppt pain level muscular fatigue task groups experimental group showed significantly lower increase pain control group middle deltoid muscle p 0002 assessed verbal pain rating scale significant interaction main effect group time observed pain level upper trapezius elbow extensor muscles ppt measures according electromyographic data median frequency values indicate neither group experienced muscle fatigue repeated contraction task preliminary results suggest short physical activity education video positively influenced middle deltoid pain following repeated abduction participants fibromyalgia electromyographic analysis showed evidence objective muscle fatigue suggesting might partial disconnection perception muscle fatigue physiological biomarkers associated muscle fatigue