Background: Modified clinical test of sensory interaction and balance (mCTSIB) was developed for systematic evaluation of balance systems. It may be performed in three standing positions, in each in the four conditions with a specific order. Stabilometry is a valid objective measure of static balance. Its parameters describe movements of the centre of pressure (CoP) while standing on a force plate. Purpose: To determine intratester reliability of the mCTSIB performed on a force plate in three standing positions, to compare feasibility of all the positions and test conditions and the outcomes between the age groups. Methods: 60 healthy participants of four adult age groups (15 subjects in each) were included in the study. Participants of the first two age groups were assessed twice with a one-week interval, and participants of the third and fourth age groups were assessed once. The mCTSIB protocol was adapted for stabilometry. Intraclass correlation coefficient (ICC3, k), ANOVA and post hoc independent t-tests with Bonferroni correction were calculated. Results: Intratester reliability for the mCTSIB in 2-leg stance under all conditions was good to excellent (ICC 0.79-0.95). For tandem stance, the reliability was good in firm surface with eyes open (FSEO) condition (ICC 0.82-0.87), moderate to good when eyes were closed (FSEC) (ICC 0.68-0.79), and poor to moderate in both compliant surface conditions (CSEO, CSEC) (ICC 0.50-0.73). For 1-leg stance, the reliability was good to excellent in FSEO (ICC 0.78-0.97), moderate to good in FCEC and CSEO (ICC 0.55-0.83) and poor to good in CSEC condition (ICC 0.39-0.82). In each test position, the stance time decreased with increased age and aggravation of test conditions. CoP velocity, and ML and AP CoP movement changed the most with aging. Conclusion: Stabilometry according to the mCTSIB protocol is reliable in healthy participants, aged from 20 to 49 years. Reliability decreases with aggravation of the test conditions and positions. MCTSIB in 2-leg stance is undemanding for young people. Tandem stance position is feasible for all age groups (20-79 years), but in 1-leg stance only FCEO condition is feasible for 50–79 years old. Additional studies with entire mCTSIB protocol with larger sample size are needed. It would be reasonable to establish whether a shorter test time influence reliability and which is the shortest data collection time sufficient for reliable results.
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