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Kinetic factors of vertical jumping for heading a ball in flexible flatfooted amateur soccer players with and without insole adoption.

Prosthet Orthot Int. 2013 Jul 4;

Authors: Arastoo AA, Aghdam EM, Habibi AH, Zahednejad S

Abstract


Background:According to literature, little is known regarding the effects of orthotic management of flatfoot on kinetics of vertical jump.Objectives:To compare the kinetic and temporal events of two-legged vertical jumping take-off from a force plate for heading a ball in normal and flexible flatfoot subjects with and without insole.Study design:A functional based interventional controlled study.Methods:Random sampling method was employed to draw a control group of 15 normal foot subjects to a group of 15 flatfoot subjects. A force platform was used to record kinetics of two-legged vertical jump shots.Results:Results indicate that insole did not lead to a significant effect on kinetics regarding anterior-posterior and mediolateral directions (p > 0.05). Results of kinetics related to vertical direction for maximum force due to take-off and stance duration revealed significant differences between the normal and flexible flatfoot subjects without insole (p < 0.05) and no significant differences between the normal foot and flexible flatfoot subjects with insole adoption (p > 0.05).Conclusions:These results suggest that the use of an insole in the flexible flatfoot subjects led to improved stance time and decrease of magnitude of kinetics regarding vertical direction at take-off as the main feature of two-legged vertical jumping function.Clinical relevanceAdoption of the insole improved the design of the shoe-foot interface support for the flexible flatfoot athletes, enabling them to develop more effective take-off kinetics for vertical jumping in terms of ground reaction force and stance duration similar to that of normal foot subjects without insole.

PMID: 23828877 [PubMed - as supplied by publisher]

Read more... http://www.ncbi.nlm.nih.gov/pubmed/23828877?dopt=Abstract