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EP-04 Biomechanics and Neural Control of Movement

BIOMECHANICAL DIFFERENCES BETWEEN SHOD AND BAREFOOT JUMPING AND LANDING TASKS

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Baha, Pardis1; Andrusiak, Josh1; Dickey, Jim1; Getgood, Alan M.2; Burkhart, Timothy A.3

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Medicine & Science in Sports & Exercise: August 2021 - Volume 53 - Issue 8S - p 176-177
doi: 10.1249/01.mss.0000761124.95848.6a
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Vertical ground reaction force (VGRF) and loading rate differences have been found between shod and barefoot conditions. While many studies have investigated VGRF during walking and running, there is limited information for jumping and landing tasks.

PURPOSE: To determine whether footwear attenuates the impact force and loading rate during jumping and landing tasks

METHODS: Nine healthy, recreationally active participants (3 male/6 female; age 21 ± 1 year; weight 61.9 ± 8.8 kg) performed a drop vertical jump (DVJ) and the squat jump (SJ) with (shod) and without (barefoot) their personal footwear. The tasks were performed on a Tekscan Strideway pressure sensing platform and the peak vertical ground reaction force (PVGRF) and loading rate were extracted from the force-time curves. The tasks were separated into two phases. This allowed for three peaks to be analyzed for the DVJ (initial landing, take off, and final landing) and two peaks for the SJ (take off and landing). One-way repeated measures ANOVAs were used to determine if there were statistically significant differences between the shod and barefoot conditions.

RESULTS: The mean [SD] PVGRF was significantly greater for the barefoot compared to shod condition during the initial (28 [19] vs. 24 [18]; p = 0.01) and final (47 [10] vs. 42 [10]; p = 0.04) landings of the DVJ. The mean [SD] PVGRF was significantly greater for the barefoot compared to the shod condition during the landing phase of the SJ (42 [20] vs. 37 [8]; p = 0.05). No significant differences were found in loading rates between barefoot and shod conditions

CONCLUSIONS: The use of footwear was found to produce lower peak forces during landings, but similar loading rates when compared to the same tasks performed barefoot. This suggests that footwear may play an important role in impact attenuation specifically during the landing phases of jumping tasks, and that footwear may contribute to mitigating injury risk during jumping tasks.Supported by NSERC(R5467A02) and Western University’s Bone and Joint Institute

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