E-35 Free Communication/Poster - Sports Biomechanics I: MAY 29, 2009 7:30 AM - 12:30 PM ROOM: Hall 4F
Minimal shoes have been promoted as a means to reduce injury risk by mimicking barefoot running. Barefoot treadmill running has been associated with a reduced rearfoot strike pattern and decreased associated impact forces. Therefore, running in minimal shoes should result in a reduction in these variables compared to a standard running shoe.
PURPOSE: The purpose of this study was to determine if a minimal shoe reduces ground reaction forces and strike pattern compared to a standard running shoe.
METHODS: This is an ongoing study with 5 subjects examined so far. Subjects were male recreational runners, 24.4 years old ± 2.7, running at least 7 miles per week (18.4, ±10.6). Minimal shoe running was novel for these subjects. Nike Pegasus shoes (Beaverton, Ore) served as the neutral cushioned shoe (NS). Nike Free 3.0 shoes were utilized for the minimal shoe condition (MS). A triaxial accelerometer (PCB Piezotronics, Depew, NY) measured tibial shock. Subjects were tested while running 3.35 m/s on an instrumented treadmill (AMTI, Watertown, Mass). Data were collected after 10 minutes for each shoe condition. Forceplate and accelerometry data were sampled at 1000 Hz. Kinematic data (Vicon, Oxford, UK) were collected at 200 Hz. Variables of interest were average vertical load rate (AVLR), tibial shock (TS), leg stiffness, ankle dorsiflexion at heel strike (DF), and horizontal angle of the foot at heelstrike in the lab coordinate system (FLAB).
RESULTS: All variables of interest were surprisingly greater in the MS condition.
CONCLUSIONS: Novel minimal shoe running appeared to have a detrimental effect on the loading variables. Adaptation to minimal shoe running may occur with time. A study of runners who habitually run in minimal shoes is underway.