Effects of Probiotics, Prebiotics, and Synbiotics on Sarcopenia Parameters in Older Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

There is scarce evidence about which probiotic, prebiotic, or synbiotic supplementation is the most appropriate to improve sarcopenia parameters, and this presents a challenge. The effects of consumption of probiotics, prebiotics, and synbiotics on sarcopenia, muscle strength, muscle mass, and physical performance and function were assessed in this study. In addition, another aim of the study was to determine the best probiotic, prebiotic, and/or synbiotic for the management of sarcopenia in older adults. A systematic search was conducted in the MEDLINE/PubMed, Cochrane Library, SCOPUS databases, and other sources (eg, references obtained from articles identified in databases). The search was limited from 2000 to 2023 and was based on sarcopenia parameters, and probiotics, prebiotics, or synbiotics supplementation. The quality of each included study also was assessed. A meta-analysis was performed with the Review Manager program and publication bias and sensitivity analysis were performed. Eight randomized controlled trials (RCTs) were included in the systematic review and 4 in the meta-analysis. Results showed that probiotics supplementation improved muscle strength and physical performance and function and suggested a beneficial effect on muscle mass. Prebiotics are suggested to be effective on muscle strength. The meta-analysis also determined that probiotic interventions were effective in increasing muscle strength by handgrip strength (mean difference [MD], 2.50 kg [95% CI, 1.33-3.66]; P