Two studies support the fact that lower MLA flexibility may accompany higher stress in soft-tissue and medial injuries. The height of the MLA can be categorized as high (pes cavus), normal, or flat arch (pes planus) and clinically, the MLA height index has proven to be a robust measure and disfunctions are often associated with foot type. Studies suggest that a relationship between the medial longitudinal arch of the foot (MLA) and the biomechanical alterations of the lower limb may predispose a person to pain and injuries such as lateral ankle sprain. Study design was approved by the IRB (#902386.5231). Thereby, in general the differences between foot types showed small effect in isokinetic muscle performance measures of the plantar and dorsi flexores. The correlations were weak between the measures of MLA and PT. The cavus and planus group had deficts in torque in relation the normal. The planus groups showed a better capacity of attain and sustained the velocity in dorsiflexion in relation the cavus group. All other results did not show differences between the groups. The heigth of MLA had a postive correlation with the PT for the cavus and planus group ate 60 °/s. The flexibility of MLA had a negative correlation of PT at 30 °/s in cavus group. Deficits in the peak torque/body mass in dorsiflexion at 60 °/s (cavus feet: MD=-3 N.m/kg ω 2 p = 0.06 and planus feet: MD=-1.1 N.m/kg ω 2 p = 0.06) were also observed as well as in the 3D surface maps, when compared with the normal group. In dorsiflexion at 60 °/s, the phase where the velocicty is sustained (load range phase) was higher in the planus group (M eanD ifference=10.9 % ω 2 p = 0.06) when compared with the cavus group. The variables total range of motion, peak of torque (PT), and angle of PT were extracted within the sustained velocity. Assessment in concentric mode at 30, 60, and 90 °/s in the dorsiflexion and plantarflexion of the ankle joint were analyzed during the three isokinetic phases (acceleration, sustained velocity, and deceleration). The sample consisted of 105 healthy adult women, divided into three groups: normal, cavus, and planus. To evaluate the muscular performance of cavus, planus, and normal feet by means of torque/body mass and the isokinetic phases, to generate 3D surface map analysis, and to verify whether there is a relationship between MLA height and arch height flexibility with isokinetic performance. Studies have demonstrated that deficits in ankle isokinetic performance can predispose an individual to lower limb injuries. Maintenance of the medial longitudinal arch (MLA) of the foot is fundamental during functional tasks and disorders can lead to clinical alterations.
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