The reliability of conducting single leg stance on the Lafayette stability platform was investigated in this study. It was found that the time in balance was shorter with eyes closed compared to eyes open, and there was a large individual variation. Therefore, the reliability of measuring balance with eyes closed on the Lafayette platform needs to be considered.
The validity and reliability of the Lafayette stability platform are well-established for double leg testing. However, no evaluation of single leg (SL) stance on the platform was discovered yet. Therefore, this study aimed to investigate the reliability of conducting the SL stance on the Lafayette platform. Thirty-six healthy and active university students (age 23.2 & PLUSMN; 3.2 years; BMI 21.1 & PLUSMN; 3.1 kg/m(2)) were tested twice, one week apart (week 1; W1, week 2; W2). They stood on their dominant leg with eyes-open (EO) and eyes-closed (EC) in random order. Three successful trials of 20 seconds each were recorded. The duration during which the platform was maintained within 0 & DEG; of tilt was referred to as time in balance (TIB). At all-time points, TIB was consistently longer in EO (EOW1: 17.02 & PLUSMN; 1.04s; EOW2: 17.32 & PLUSMN; 1.03s) compared to EC (ECW1: 11.55 & PLUSMN; 1.73s; ECW2: 13.08 & PLUSMN; 1.82s). A & PLUSMN;10 seconds difference was demonstrated in the Bland-Altman analysis in both EO and EC. Lower standard error of measurement (SEM) and coefficient of variation (CV) indicated consistent output. High intraclass correlation coefficient (ICC) values were seen between weeks (EO = 0.74; EC = 0.76) and within weeks (EOW1 = 0.79; EOW2 = 0.86; ECW1 = 0.71; ECW2 = 0.71). Although statistical measures (i.e., SEM, CV, and ICC) indicated good reliability of Lafayette for SL tasks, the wide agreement interval is yet to be clinically meaningful. Factors underlying the wide variation need to be identified before Lafayette is used for TIB assessment.
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