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Influence Of Habitual Footwear And Foot Strike On Resultant Ground Reaction Forces.: 1157 Board #2 May 28, 800 AM - 1000 AM

Rice, Hannah M.; Jamison, Steve T.; Davis, Irene S. FACSM

Medicine & Science in Sports & Exercise: May 2015 - Volume 47 - Issue 5S - p 293
doi: 10.1249/01.mss.0000477222.50906.b2
C-18 Thematic Poster - Running Footwear Thursday, May 28, 2015, 8:00 AM - 10:00 AM Room: 30D
Free

Spaulding National Running Center, Harvard Medical School, Cambridge, MA.

Email: HRICE1@partners.org

(No relationships reported)

Running with a forefoot strike (FFS) pattern can reduce vertical instantaneous loading rates (VILR), which have been related to injuries. However, running with a novel FFS pattern in habitual rearfoot strikers (RFS) has been shown to result in greater peak anteroposterior and mediolateral instantaneous loadrates (ILR). This resulted in similar resultant ILR (RILR) experienced by the body, which has led to a questioning of the overall value of FFS pattern.

PURPOSE: To compare individual as well as R-ILR in 3 distinct habitual running conditions: shod RFS, shod FFS and minimally shod FFS. These habitual conditions were used to improve the ecological validity of the results.

METHODS: 5 subjects in each condition (15 subjects total) running at least 10 mpw, were recruited in this ongoing study. Subjects ran (2.68 ms-1) in their habitual condition in lab-provided footwear along a 30m runway, striking a forceplate at its center. Forces were normalized to body weight. Loadrates were determined within the initial 20% of stance. Statistical tests were not conducted due to the small subject number at this time.

RESULTS: Peak RILR was highest in the shod RFS group and lowest in the minimalist FFS group (Fig 1). In all conditions, VILR was the largest contributor to RILR. Posterior ILR was greatest in the shod FFS group. Lateral ILR was greatest in the shod FFS group and lowest in the minimalist FFS group.

CONCLUSIONS: These early results suggest that running with a FFS pattern reduces the rate of both vertical and resultant loading experienced by the body, to a greater extent in minimally shod compared with traditionally shod runners.

Figure 1: Average resultant ILR (left panel), and resultant and individual peak ILR (right panel) in 3 habitual running conditions.

© 2015 American College of Sports Medicine