Benefits of Physical Activity during and after Thyroid Cancer Treatment on Fatigue and Quality of Life: A Systematic Review

Simple Summary The usefulness of physical activity in a preventive key is no longer in question, whereas sports therapy is assuming an increasingly important role in cancer rehabilitation. This review provides an overview on the effects of physical activity on fatigue, quality of life (QoL) and health-related quality of life (HRQoL) in patients with thyroid cancer diagnosis both during and after treatment, with a focus on sex. We found that the level of confidence in the available evidence is very low. Future studies are needed to understand which training programs are optimal, both in terms of beneficial effects and to avoid potential adverse responses, in addition to focusing on gender differences. Background: Several epidemiological studies have provided evidence of the usefulness of physical activity for cancer prevention, increased survival and quality of life (QoL), but no comprehensive review is available on the effects on thyroid cancer. The present systematic review provides an overview of the effects of physical activity on fatigue, QoL and health-related quality of life (HRQoL) in patients with thyroid cancer diagnosis both during and after treatment, with a focus on sex. Methods: A literature search was conducted in the PubMed and Scopus databases. We included studies investigating the impact of physical activity during and after thyroid cancer treatment, including fatigue, QoL and/or HRQoL among the outcomes. Review articles, conference papers, short communications and articles written in a language other than English articles were excluded. Study selection followed the preferred reporting items for systematic reviews and meta-analyses guidelines (PRISMA). Two reviewers independently selected the studies and assessed their eligibility. The same two reviewers independently screened studies, extracted data and assessed the risk of bias. Outcomes of interest were fatigue, QoL and HRQoL. The Newcastle-Ottawa Scale was used to assess the quality of the selected studies. We compared the outcomes between groups of patients with subclinical hyperthyroidism undergoing a physical activity program and a sedentary group, evaluating the possible presence of sex differences. Results and Discussion: We found five studies eligible for inclusion in our review; only two were prospective studies including an exercise training program. One study was a quasi-experimental study with a non-equivalent control group. Three out of five studies comprised low-quality evidence with a high risk of bias. Conclusion: The level of confidence in the available evidence is very low. A close association between physical activity and fatigue, QoL and HRQoL in patients with thyroid cancer diagnosis with a focus on sex can neither be supported nor refuted. Future studies are needed to understand which training programs are optimal, both in terms of beneficial effects and to avoid potential adverse responses, in addition to focusing on gender differences. The protocol of this systematic review was registered with PROSPERO: CRD42022322519.