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Crossfit Improves Measures Of Muscular Strength And Power In Active Young Females: 2912 Board #227 May 29, 3: 30 PM - 5: 00 PM

First metatarsophalangeal (MTP) joint sprain is an injury increasing in prevalence in football players resulting in a significant loss of participation time. Investigation of the unique plantar loading strategies in football may help identify critical components that predispose an athlete to MTP joint sprains. Furthermore, limitations in ankle dorsiflexion range of motion may increase the loading on the plantar side of the forefoot and hallux during late stance of athletic movements. PURPOSE: Therefore, the purpose was to examine the effects of ankle dorsiflexion range of motion on forefoot and toe plantar loading during a weighted sled-pushing task. METHODS: Subjects were dichotomized into low dorsiflexion (LD; n=5, height 178.7cm, mass 79.2kg, age 16.8yrs) and high dorsiflexion (HD; n=9, height 175.3cm, mass 79.6kg, age 17.9yrs) range of motion based on the mean value of 8.8cm. Ankle dorsiflexion range of motion was assessed during the standing knee-to-wall test. In-cleat plantar pressure distribution was measured during a weighted (75% of the subject’s body mass) sled-pushing task on a synthetic turf field while wearing standard football cleats. Force time integral was calculated for 9 specific regions and normalized to total foot force time integral. ANOVA (p<0.05) was used to determine the group differences in the relative load for each foot region. Only the forefoot and toe regions were analyzed as those regions had the majority of the total foot loading during the task. RESULTS: Significantly greater relative loading was found under the hallux in subjects who had decreased ankle dorsiflexion range of motion (LD 24.4±6.8%, HD 18.1±3.8%, p=0.044). In contrast, the subjects with greater dorsiflexion range of motion loaded the medial forefoot significantly more (LD 14.3±4.3%, HD 19.7±3.7%, p=0.029). CONCLUSIONS: Greater hallux loading was found during a task that required a large magnitude of MTP joint extension in football players who exhibited decreased ankle dorsiflexion range of motion. Future studies should determine whether interventions aimed at increasing ankle dorsiflexion modify hallux loading. The authors would like to acknowledge funding support from adidas International, Inc.