Which Type of Exercise During Radiation Therapy Is Optimal to Improve Fatigue and Quality of Life in Men with Prostate Cancer? A Bayesian Network Analysis

CONTEXT: Physical exercise in men with prostate cancer (CaP) has shown benefits in improving cancer-related fatigue (CRF) and quality of life (QoL) during radiation therapy. However, types of exercises that are more effective are not well understood. EVIDENCE ACQUISITION: We searched PubMed, Web of Science, and ClinicalTrials.gov up to November 2021 to identify potentially relevant studies. Randomized controlled trials (RCTs) testing the effects of exercise training on CRF, QoL, and treatment-related toxicities in patients with CaP undergoing radiation therapy were included. The quality of individual studies was evaluated using the Tool for the assEssment of Study qualiTy and reporting in Exercise (TESTEX) scale. The certainty of evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation method. A meta-regression analysis was conducted to test the study-level covariates. A random-effect network meta-analysis was conducted based on a Bayesian model. EVIDENCE SYNTHESIS: Eight RCTs with 466 participants were included. Exercise achieved significant improvements in CRF (standardized mean difference [SMD] = 1.24, 95% confidence interval or CI [0.43, 2.06], I(2) = 93%) and QoL (SMD = 1.40, 95% CI [0.05, 2.75], I(2) = 95%). Based on the meta-regression and Bayesian model, combined moderate-intensity continuous training aerobic exercise and resistance exercise (MICT/RES) showed the highest probability of ranking first in terms of CRF and QoL improvement, but the results of QoL were unstable. Exercise training also had a positive effect on urinary toxicities (SMD = –0.53, 95% CI [–0.79, –0.27], I(2) = 0%). A subgroup analysis indicated that MICT/RES might be the most promising exercise modality for reducing intestinal toxicities (SMD = –1.76, 95% CI [–2.32, –1.20]). CONCLUSIONS: MICT/RES might be superior to any other types of exercise at reducing CRF. MICT/RES was more effective on significantly mitigating urinary and intestinal toxicities. PATIENT SUMMARY: In prostate cancer (CaP) survivors during radiation therapy, exercise training is an effective and safe intervention to reduce cancer-related fatigue (CRF) and improve quality of life (QoL), and should be prescribed as a rehabilitation option for clinical management. As for the types of exercises, moderate-intensity continuous training aerobic exercise and resistance exercise seem to be the most effective interventions to reduce CRF, improve QoL, and mitigate treatment-related symptoms.