E-29 Free Communication/Poster - Foot and Ankle Mechanics Friday, June 3, 2016, 7:30 AM - 12:30 PM Room: Exhibit Hall A/B
The importance of foot strength to proper arch mechanics has been recently recognized. Foot strengthening has been shown to increase the static height of the arch. However, it is not known whether these effects carry over into dynamic activities.
PURPOSE: To determine if an 8-wk foot strengthening program reduces the vertical deformation of the arch during the mid-stance in running.
METHODS: 35 healthy, recreational runners (18 males, age 24 ± 3.58 yrs) have completed this ongoing study. To date, 22 subjects are in the control group (CON: 8 wks of their normal running) and 13 are in the treatment group (TX: 8 wks of foot strengthening, along with their normal running). Static arch height and dynamic arch drop were measured at baseline and following the strengthening program using a motion analysis system. Markers were placed on the proximal and distal ends of the 1st and 5th metatarsals. These 4 markers were recorded during static stance (for AH) and during single leg mid-stance (for arch drop) during treadmill running at a self selected pace. 10-second trials were averaged. The Arch Height (AH) was calculated as the perpendicular distance from the marker at the proximal 1st metatarsal to the plane formed by the other 3 markers. Arch drop was measured as the AH during mid-support relative to the static AH.
RESULTS: No differences were noted in arch drop between the groups as a whole (Table 1). However, there was a significant decrease in arch drop from baseline to week 8 in the TX group for subjects with an initial arch drop of 3.80 mm or greater (p=.0045).
CONCLUSIONS: These preliminary data suggest that the exercise intervention was most effective at decreasing arch drop in those with the most planus feet. Data will be reanalyzed when recruitment is complete.