Prevalence of sarcopenia in middle-aged and older adults with cognitive impairment: a meta-analysis

Abstract Background Cognitive impairment, dementia and sarcopenia significantly reduce the quality of life in middle-aged and older adults by impairing daily functioning, making cognitive decline a major concern for healthcare professionals. Objective To estimate the prevalence of sarcopenia and probable sarcopenia in middle-aged and older adults with cognitive impairment. Methods Six databases—Embase, Ovid MEDLINE, PubMed, CINAHL, Scopus and Web of Science was conducted through February 2025. Cohort and cross-sectional studies included, and a random-effects model was used for pooled prevalence analysis. Cognitive impairment is a decline in cognitive functions, including memory, attention and executive function, covering mild cognitive impairment and dementia. Sarcopenia is decreased skeletal muscle mass and function, assessed by muscle strength or physical performance. Results A total of 67 studies involving 23 532 participants revealed a pooled sarcopenia prevalence of 30.1% and a probable sarcopenia prevalence of 40.5%. Additionally, amongst adults aged 65 and older, the prevalence of sarcopenia was 32.7%. The prevalence of sarcopenia varied by setting: 25.3% in community-dwelling populations, 35.5% in hospitals and 41.5% in institutional settings. Moderating factors included age, female, body mass index, comorbidities and risk factors such as depression, diabetes, hypertension, malnutrition, osteoarthritis, alcohol consumption and smoking. Conclusions Approximately one-third of middle-aged and older adults with cognitive impairment demonstrate to have sarcopenia. Early detection and tailored interventions by public health professionals are crucial, particularly for individuals with mild cognitive impairment and dementia. Enhanced preventive strategies are essential to improving outcomes and reducing healthcare costs.