Scoping review to investigate what are the different anthropometry-based equations proposed for predicting appendicular skeletal muscle mass (ASM) measured through dual-energy x-ray absorptiometry (DXA). The search for primary and secondary studies design will be carried out in the following databases: EMBASE, LILACS, MEDLINE, Scopus, SPORTDiscus, and Web of Science. In addition, the grey literature will be consulted using Google Scholar, medRxiv, and Research Square. The identified studies (without duplicates) will be imported into the Rayyan software and evaluated/selected based on previously established eligibility criteria through reading the title and abstract (phase 1), followed by reading the full text of the selected studies in phase 1 (phase 2). In order to identify other eligible studies, the lists of references cited by selected studies in the Phase 2 will be analyzed. The data of selected studies will be rigorously analyzed and collected through filling out a characterization table. All steps will be carried out by two independent and blinded reviewers, and in case of disagreements by a third reviewer. A qualitative (narrative) synthesis will be provided, describing the anthropometric predictive equations proposed in each study, according to the continent, country, age group, health condition (if proposed for a specific disease), and sex. A descriptive table will group all this information.