Exercise interventions to combat cancer-related fatigue in cancer patients undergoing treatment: a review

There was an average of 45,753 cancer diagnoses each year in Ireland from 2018 to 2020. Estimates state that by the year 2045, this average could increase by 50–100%. There are over 170,000 cancer survivors living in Ireland. Cancer-related fatigue (CRF) is a prevalent and debilitating side effect of cancer and cancer treatment. Research has demonstrated that exercise is an effective intervention to combat CRF. This review will examine the scope of CRF and critically analyse exercise interventions to combat CRF in cancer patients undergoing treatment. Aerobic exercise interventions and multimodal exercise (aerobic exercise, resistance exercise and flexibility exercise) interventions have been shown to improve symptoms of fatigue in cancer patients undergoing treatment. The effect of resistance training on CRF in cancer patients during treatment is not well understood. Aerobic exercise and multimodal exercise appear to combat CRF by improving one or more of the following health-related fitness parameters; aerobic capacity, muscular strength and endurance, flexibility, and body composition. A standardized process of recording the intensity and volume of aerobic, resistance and flexibility exercise should be developed. Future studies should investigate in greater detail the role of resistance training in reducing CRF among cancer patients. Qualitative methods should be developed to investigate the role the group dynamic has on cancer patients during group-based interventions. These qualitative methods may be able to determine the importance the delivery of exercise plays in reducing CRF. Biomarkers of CRF should be investigated and examined in relation to the specific dose of exercise that patients perform.