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Physical inactivity and sedentary behaviours are considered as risk factors for global mortality and primary contributors to the obesity epidemic. We assessed the psychometric properties and transcultural adaptation into Spanish of the Sedentary Behaviour Questionnaire in fibromyalgia patients.The Spanish version of the Sedentary Behaviour Questionnaire (SBQ-S) was translated and cognitively pretested following cross-cultural adaptation guidelines. Test-retest reliability was evaluated in 114 fibromyalgia patients. Fifty-one participants wore a body monitoring device (SWA) for nine consecutive days and filled the SBQ-S twice (separated by a one-week interval). Measures of sedentary time assessed by the SBQ-S and the SWA were compared.Overall reliability of the SBQS scores was good. The intraclass correlation coefficients were excellent for the SBQ-S total scores (from 0.83 to 0.86), and varied from moderate to excellent for 10 of the 11 sedentary behaviours (from 0.52 to 0.96). There was no significant association between the SBQ-S and the SWA for the weekday, weekend, and total sedentary time (from r -0.06 to -0.03). Differences between the SBQ-S and the SWA increased as the hours per day of sedentary time increased (beta coefficients varied from -0.713 to -0.330, all p0.02).The SBQ-S developed in this study presents a good reliability and poor convergent validity when compared with the SWA in the Spanish fibromyalgia patients studied.

The aim of this study was to assess the psychometric properties and transcultural adaptation into Spanish of the Multidimensional Fatigue Inventory in fibromyalgia patients.The Spanish version of the Multidimensional Fatigue Inventory (MFI-S) was translated and cognitively pretested following cross-cultural adaptation guidelines. Test-retest reliability, convergent validity, and operational qualities were evaluated in a total of 116 fibromyalgia patients. Convergent validity was assessed comparing MFI-S with a visual analogue scale for global fatigue.The intra-class correlation coefficients varied from moderate to excellent (from 0.64 to 0.91) and the standard errors of the mean ranged from 0.5 to 1.1 points for the five MFI-S domains. The coefficient of repeatability was less than 2 standard deviations and the limits of agreement ranged from 2 to 4 points for the MFI-S domains. A weak to fair significant relationship was found between each MFI-S domain and the visual analogue scale (from 0.21 to 0.32). The mean time required to complete the MFI-S was 3.2±2.0 minutes. None of the patients needed external help to complete the MFI-S, and there were very few missing values.The MFI-S developed in this study presents a good reliability and reasonable construct validity for Spanish fibromyalgia patients unaffected by cognitive dysfunction and severe depression. This questionnaire is quick, easy to administer and interpret.