The aim of this study was to investigate respiratory muscle sarcopenia in individuals with systemic sclerosis. The main question it aims to answer is: What is the prevalence of respiratory muscle sarcopenia in patients with systemic sclerosis? Participants body composition (bioelectrical impedance), hand grip strength (hand dynanometer), physical performance tests (5 repetition sit-and-stand test, 4-meter walk test, Timed up-and-go test) and respiratory muscle strength were evaluated.