BioMed Research International

Research Article

Kinematic Validation of Postural Sway Measured by Biodex Biosway (Force Plate) and SWAY Balance (Accelerometer) Technology

Table 1

Mean ± standard deviation of dependent variables for each test condition.


	C1 Eyes open, firm surface, double leg	C2 Eyes closed, firm surface, double leg	C3 Eyes open, foam surface, double leg	C4 Eyes closed, foam surface, double leg	C5 Eyes open, foam surface, right single leg	C6 Eyes open, foam surface, left single leg	C7 Eyes closed, firm surface, right single leg	C8 Eyes closed, firm surface, left single leg	C9 Eyes open, firm surface, anterior posterior sway	C10 Eyes open, firm surface, medial lateral sway

SBMA score	100.0 ± 0.0	100.0 ± 0.0	100.0 ± 0.0	99.5 ± 0.9	89.9 ± 11.0	89.5 ± 9.4	81.3 ± 18.8	82.1 ± 17.4	96.1 ± 5.4	99.4 ± 6.1
Biosway® SI	0.64 ± 0.24	0.68 ± 0.24	1.15 ± 0.37	1.57 ± 0.42	0.77 ± 0.18	0.96 ± 0.32	1.34 ± 0.39	1.59 ± 0.48	3.68 ± 0.49	4.11 ± 0.80
Mean BOS area (m²)	0.077 ± 0.008	0.077 ± 0.080	0.078 ± 0.009	0.079 ± 0.009	0.015 ± 0.004	0.016 ± 0.002	0.016 ± 0.020	0.016 ± 0.002	0.078 ± 0.008	0.079 ± 0.008
Biosway® SI/BOS (m⁻²)	8.23 ± 3.06	8.85 ± 3.26	14.80 ± 5.08	20.08 ± 5.28	50.04 ± 12.07	62.47 ± 23.24	85.58 ± 26.52	103.06 ± 37.38	47.76 ± 7.58	52.45 ± 8.97
COM SI (m)	0.0041 ± 0.0018	0.0043 ± 0.0017	0.0077 ± 0.0027	0.0089 ± 0.0030	0.0073 ± 0.0017	0.0080 ± 0.0029	0.0134 ± 0.0106	0.0123 ± 0.0054	0.0476 ± 0.0070	0.0756 ± 0.0144
COM SI/BOS (m/m²)	0.0533 ± 0.0221	0.0556 ± 0.0219	0.0989 ± 0.0362	0.1135 ± 0.0345	0.4722 ± 0.1119	0.5217 ± 0.2018	0.8485 ± 0.6292	0.7879 ± 0.3383	0.6140 ± 0.0881	0.9632 ± 0.1635
COM velocity (m/sec)	0.0028 ± 0.0009	0.0034 ± 0.0010	0.0056 ± 0.0012	0.0107 ± 0.0037	0.0122 ± 0.0041	0.0122 ± 0.0040	0.0225 ± 0.0078	0.0218 ± 0.0074	0.0567 ± 0.0086	0.0883 ± 0.0174
COM velocity/BOS (m⁻¹·sec⁻¹)	0.036 ± 0.011	0.045 ± 0.013	0.073 ± 0.018	0.137 ± 0.045	0.791 ± 0.278	0.798 ± 0.284	1.44 ± 0.51	1.41 ± 0.53	0.73 ± 0.10	1.13 ± 0.20

Mean ± standard deviation of SWAY Balance Mobile Application (SBMA) scores, Biosway Sway Index (SI), Biosway SI divided by Base of Support (BOS), and Center of Mass (COM) Balance indices (COM SI/BOS and COM velocity/BOS) for conditions C1 through C10. A larger velocity and SI score represent more postural sway. A larger SBMA score represents less postural sway.