Each subject was evaluated before , at the end ( T1 ) , and after 6 months ( T6 ) from the conclusion of the rehabilitation treatment using the Fibromyalgia Impact Questionnaire ( FIQ ) , the visual analogue scale ( VAS ) , the Health Assessment Questionnaire ( HAQ ) , the fatigue severity scale ( FSS ) , the 6-minute walking test ( 6MWT ) , tender points count ( TPC ) , and spinal active range of motion .