Currently submitted to: JMIR mHealth and uHealth
Date Submitted: May 6, 2019
Open Peer Review Period: May 9, 2019 - Jul 4, 2019
(currently open for review)
Patterns of sedentary time and quality of life in women with fibromyalgia: a cross-sectional study from the al-Ándalus project.
Sedentary time (ST) has been detrimentally associated with health outcomes in fibromyalgia. Previous evidence in general population showed that not only the total amount of ST but also the pattern of accumulation of sedentary behaviors is relevant to health, being prolonged, unbroken periods (i.e. bouts) particularly harmful.
To examine the association of the patterns of ST with health-related quality of life (HRQoL) in women with fibromyalgia, and to test if these associations are independent of moderate-to-vigorous physical activity (MVPA).
Four-hundred-and-seven (51.4±7.6 years old) women with fibromyalgia participated. ST and MVPA were measured with triaxial accelerometry. Percentage of ST accumulated in bouts and frequency of sedentary bouts of different lengths (≥10, ≥20, ≥30, ≥60 min) were obtained. Four groups combining total ST and sedentary bout (≥30min) duration were created. We assessed HRQoL with the 36-item Short-Form health survey (SF-36).
Greater percentage of ST spent in all bouts lengths was associated with worse physical function, bodily pain, vitality, social function and physical component summary (PCS) (all, p<0.05). In addition, higher percentage of ST in bouts of ≥60 min was related to worse physical role (p=0.036). Higher frequency of bouts was negatively associated with physical function, social function, the PCS (≥30 min, and ≥60 min), physical role (≥60 min), bodily pain (≥60 min), vitality (≥20, ≥30 and ≥60 min) all p<0.05). Overall, for different domains of HRQoL these associations were independent of MVPA for higher bout lengths. Patients with high total ST and high sedentary bout duration had significantly worse physical function (mean difference=8.73 units; 95% CI: 2.31 to 15.15; independently of MVPA), social function (10.51 units; 2.59 to 18.44; not independent of MVPA) and the PCS (2.71 units; 0.36 to 5.06;not independent of MVPA) than those with low ST and low sedentary bout duration.
Greater ST in prolonged periods (of any length) and higher frequency of ST bouts (especially in longer bout durations) are associated with worse HRQoL in women with fibromyalgia. These associations were generally independent of MVPA.
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