Effects of Using Insoles of Different Thicknesses in Older Adults: Which Thickness Has the Best Effect on Postural Stability and Risk of Falling?

BACKGROUND

Postural stability (PS) problems arise as individuals grow older, and as a result, risk of falling (RoF) increases in older adults. We sought to examine the effects of insoles of various thicknesses on PS and RoF in older adults.

METHODS

Fifty-six study participants had PS and RoF evaluated statically and dynamically under five different conditions: barefoot, only-shoes, with 5-mm insoles, with 10-mm insoles, and with 15-mm insoles. Standard shoes with identical features were used. To avoid time-dependent problems, these assessments were performed under the same conditions in 3 consecutive weeks. The average of these three values was recorded.

RESULTS

Insoles of different thicknesses significantly affected static PS (overall: P =.003; mediolateral [ML]: P =.021; anteroposterior [AP]: P =.006), static RoF (overall, ML, and AP: P < .001), dynamic RoF (overall: P = .003; ML: P = .042; AP: P = .050), and dynamic PS (overall: P = .034; AP: P = .041) but not dynamic PS ML (P = .071). For static PS overall, dynamic PS AP, static RoF overall and ML, and dynamic RoF overall and ML, the highest PS scores and the lowest RoF were recorded when using 10-mm insoles (P < .05).

CONCLUSIONS

The use of insoles of different thicknesses has been shown to be effective on all RoF and PS measurements except dynamic PS ML. The 10-mm-thick insole was a better option for elderly individuals to increase PS and reduce RoF compared. For older adults, 10-mm-thick insoles made of medium-density Plastozote may be recommended to help improve PS and reduce RoF.