Abstract Summary
Maximal back extension force of the participants was measured using a dynamometer while standing barefoot and on top of two insole conditions (AUTO and DELTA insoles). Only DETLA insole demonstrated a significant positive effect on back strength. We found that most subjects improved their force profile (good responders) but that there were also some non-responders for the effect of this insole. Responders were characterised as having a significantly pronated rearfoot compared to that of the non-responders, with the supportive DELTA insole realigning their feet, lower limbs to reduce the amount of pronation. It should be concluded 1) an insole having unique corrective arch supports can be an effective tool for improving force transmission through the ankle and maximum back strength in this task and 2) the beneficial effect of the corrective insoles is dependent on individual foot alignment.
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