Objective
To assess and to compare the balance control between healthy old and young adults using clinical tests and tetra-ataxiametric posturography. Method: Eighteen healthy elderly adults over 60 years old and twenty one young individuals under 60 years old were recruited. All subjects had no neurological, cognitive and musculoskeletal problems, and were capable of standing and walking independently. The postural control capabilities of the subjects were assessed using the timed up and go test, Berg balance scale and a TetraxⰒ tetra-ataxiametric posturography (Tetrax, Ramat Gan, and Sunlight Medical, Tel-Aviv, Israel), which utilized two paired force plates measuring vertical pressure fluctuations over both heels and forefeet. Stability index, weight distribution index, synchronization index, and Fourier index were measured at six different head positions and at two positions with standing on pillows, and analyzed by independent t-test. Results: The stability index was higher in the elderly subjects (p＜0.05) than in young subjects, which indicated that the ability of balance control in the elderly subjects was poor. The abnormality of peripheral vestibular system, central nervous system and musculoskeletal system all affected the balance control in the elderly subjects, when standing on pillows or turning head to the up, down, right and left sides. However, the weight distribution index and synchronization of both heels and forefeet were not significantly different between the elderly and young subjects. Conclusion: These findings suggest that elderly adults have more deficits in postural control than young subjects. Therefore changing environment around elderly adults and educating for prevention of falls were needed. (J Korean Acad Rehab Med 2009; 33: 429-435)
