Work

Development and Validation of the Low Sit–High Step Test for Assessing Lower-Extremity Function in Sarcopenia

Year: 2026

Type: article

Abstract: Objective: The study aimed to evaluate the validity and reliability of the newly developed Low Sit–High Step (LS-HS) Test designed to assess lower-extremity muscle strength in the diagnosis of sarcopenia. Design: The study included 205 participants divided into four groups (possible sarcopenia, sarcopenia, young control, and middle-to-older control). The LS-HS Test was compared across groups, and its ability to distinguish sarcopenia and possible sarcopenia was evaluated. Internal consistency, inter-rater and test–retest reliability, and diagnostic accuracy were assessed to determine the test’s validity and reliability. Results: LS-HS Test scores were higher in participants with possible sarcopenia and sarcopenia (p<0.05). Multinomial logistic regression analysis showed that LS-HS Test performance could predict both possible sarcopenia and sarcopenia (p<0.001). Internal consistency was excellent (Cronbach’s α = 0.938), while inter-rater and test–retest reliability were very high (ICC = 0.998), confirming its reproducibility. ROC analysis demonstrated high diagnostic accuracy in distinguishing both possible sarcopenia and sarcopenia (p<0.01, AUC=0.768, AUC=0.704). Conclusions: The LS-HS Test appears to be a valid, reliable, and practical tool for assessing lower-limb muscle strength and functional decline in the diagnosis of sarcopenia. Its simplicity and clinical applicability suggest that it may serve as a useful option for routine screening and evaluation.

Source: Diagnostics

DOI: 10.3390/diagnostics16030480