Cut-offs of the 1-minute sit-to-stand test and quadriceps muscle strength to detect functional impairment

• Autor(a) principal: Barros, Cíntia Dias de
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/36616
• topic: Functional status; Functionality; Healthy people; Assessment; Intervention; Muscle strength

Background: Functional status decline is associated with the aging process. It is an identifiable, modifiable and highly meaningful trait for people’s autonomy. Assessment of functional status is, however, not implemented in routine clinical practice and identification of its impairment is often challenging. Aim: To establish cut-off values for the 1-minute sit-to-stand test (1-min STS) and for the quadriceps muscle strength (QMS) to identify lower-limb functional impairment in healthy people. Methods: A cross-sectional study was conducted with healthy people, aged between 50 and 89 years. Functional capacity was assessed with the 1-min STS, the 5-repetition sit-to-stand test (5-STS) and QMS. The receiver operating characteristic (ROC) analysis was used to explore the ability of the 1-min STS and QMS to discriminate participants’ performance in the 5-STS, and the area under the curve (AUC) was calculated. Results: A total of 341 participants (71% male; mean age 68 [61; 73] years; body mass index 27 [24.7; 30.4] kg/m²; 6.5% with functional impairment) were included. Cut-off values established for low performance were 25.5 repetitions in the 1-min STS and 24.8 kgf for QMS. The 1-min STS had an outstanding discrimination (AUC = 0.96), with 90% specificity, 91% sensitivity and accuracy of 0.91 to discriminate the performance of healthy people in the 5-STS. QMS had an excellent discrimination (AUC= 0.79), with 66% specificity, 85% sensitivity and an accuracy of 0.51. Conclusion: Cut-off values of 25.5 repetitions in the 1-min STS test and 24.8 kgf in QMS accurately discriminate healthy people with functional impairment. These cut-offs can now be used to help health professionals in their decision-making process when planning to prevent and/or avoid loss of lower-limb functioning.