Abstract
Purpose
Cancer-related fatigue (CRF) is a common and distressing symptom of cancer that may persist for years following treatment completion. However, little is known about the pathophysiology of CRF. Using a comprehensive group of gold-standard physiological and psychosocial assessments, this study aimed to identify correlates of CRF in a heterogenous group of cancer survivors.
Methods
Using a cross-sectional design to determine the physiological and psychosocial correlates of CRF, ninety-three cancer survivors (51 fatigued, 42 non-fatigued) completed assessments of performance fatigability (i.e. the decline in muscle strength during cycling), cardiopulmonary exercise testing, venous blood samples for whole blood cell count and inflammatory markers and body composition. Participants also completed questionnaires measuring demographic, treatment-related, and psychosocial variables.
Results
Performance fatigability, time-to-task-failure, peak oxygen uptake (V̇O2peak), tumor necrosis factor-α (TNF-α), body fat percentage, and lean mass index were associated with CRF severity. Performance fatigability, V̇O2peak, TNF-α, and age explained 35% of the variance in CRF severity. Those with clinically-relevant CRF reported more pain, more depressive symptoms, less perceived social support, and were less physically active than non-fatigued cancer survivors.
Conclusions
The present study utilised a comprehensive group of gold-standard physiological and psychosocial assessments and the results give potential insight into the mechanisms underpinning the association between physical inactivity, physical deconditioning and CRF.
Implications for Cancer Survivors
Given the associations between CRF and both physiological and psychosocial measures, this study identifies targets that can be measured by rehabilitation professionals and used to guide tailored interventions to reduce fatigue.
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Data availability
Data available upon request.
Code availability
Not applicable.
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Acknowledgements
The authors would like to thank the Canadian Cancer Society for funding the study (grant #704208-1). The authors would also like to acknowledge and sincerely thank Dr. Renata Krüger for her assistance with phlebotomy and the careful storage of blood samples, and Doug Doyle-Baker for his assistance with data collection. Finally, the authors would like to thank the participants—without them, this research would not be possible.
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The study was funded by the Canadian Cancer Society (grant #704208–1).
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G.Y.M conceived and designed the study; R.T, J.T, T.M and M.M performed experiments; C.G.B, R.T, J.T and J.G.W analysed data; C.G.B, G.Y.M, R.T interpreted results of experiment; C.G.B drafted manuscript; R.T, J.T, J.G.W, T.M, M.M, N.C.R and G.Y.M edited and revised manuscript. C.G.B, R.T, J.T, J.G.W, T.M, M.M, N.C.R and G.Y.M approved final version of manuscript.
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Approval for all procedures was obtained by the Conjoint Health Research Ethics Board and the Health Research Ethics Board of Alberta Cancer Committee (REB14-0398 and HREBA.CC-16–10-10, respectively). The study was conducted in accordance with all aspects of the Declaration of Helsinki, apart from registration in a database.
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Brownstein, C.G., Twomey, R., Temesi, J. et al. Physiological and psychosocial correlates of cancer-related fatigue. J Cancer Surviv 16, 1339–1354 (2022). https://doi.org/10.1007/s11764-021-01115-6
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DOI: https://doi.org/10.1007/s11764-021-01115-6