Predictors of fatigue in sarcoidosis: The value of exercise testing

B. Strookappe, J. de Vries, M.D.P. Elfferich, P.M. Kuijpers, M. Drent

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

Background
Sarcoidosis patients often are troubled by dyspnea, exercise limitation, and fatigue. Many patients (up to 50–81%) suffer from sarcoidosis-associated fatigue. The etiology of fatigue in sarcoidosis is still unclear.
Objective
The aim of this study was to assess the relationship between fatigue and both exercise capacity and clinical characteristics in sarcoidosis patients. Additionally, we studied the predictive value of exercise test results and other relevant clinical characteristics for the independent variable of fatigue.
Methods
From November 2012 to September 2014, 201 sarcoidosis outpatients were referred to the Dutch ILD care foundation expertise team, 146 of whom were included in this retrospective cohort study. All patients completed the Fatigue Assessment Scale (FAS). Exercise capacity was assessed by the 6-min walking distance (6MWD) and steep ramp test (SRT) result. Clinical data were gathered from the medical records.
Results
Exercise capacity only showed a weak correlation with fatigue (r = 0.25, p = 0.002 for 6MWD % of predicted; r = 0.24, p = 0.003 for SRT). Fatigue was not correlated with the demographic variables of age, body mass index, or time since diagnosis. Inflammatory markers, lung function tests, and hand grip strength showed no significant correlations with fatigue. Backward multiple regression analysis showed that only female sex (t = −2,614, p = 0.01) and 6MWD % of predicted (t = −2.773, p = 0.006) were independent predictors of fatigue. However, the r2 indicated that these two variables together explained only 11% of the FAS score.
Conclusions
These results show that exercise capacity partly predicts patients’ fatigue scores. Fatigue was not explained by lung function test results, inflammatory markers, or other clinical parameters.
Keywords: Exercise capacity, Fatigue, Sarcoidosis
Original languageEnglish
Pages (from-to)49–54
JournalRespiratory Medicine
Volume116
DOIs
Publication statusPublished - 2016

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