The aim of our research was to assess the impact of foot muscle strength training on the longitudinal arch of the foot. We designed foot muscle strength training, which the subject performed for 18 weeks. She performed 5 exercises, according to the extensive bodybuilding method and the method of maximal load. Prior to commencing and after completing the strength training, we conducted measurements. We measured body height, body weight, recorded the age of the subject, measured passive navicular drop, dynamic navicular drop, active ankle mobility in the direction of dorsal and plantar flexion, inversion and eversion. We found that in the second measurement, the passive navicular drop of the left leg was relatively greater than in the right leg compared to the first measurement. The dynamic navicular drop of the left leg in the first measurement was greater than in the second measurement. The dynamic navicular drop of the right leg in the first and second measurements was the same. Active ankle dorsiflexion decreased in the second measurement of the left leg and increased in the right leg. Active plantar flexion in the ankle of the left leg was the same in both measurements, but in the right leg it increased in the second measurement. Active inversion in the ankle of the left leg was the same in both measurements, but in the right leg it increased in the second measurement. Active eversion in the ankle of the left and right leg was greater in the second measurement. Our findings indicate that the selected 18-week foot muscle training program positively influenced the longitudinal foot arch in terms of passive navicular drop. However, no positive effects of the exercise were observed in dynamic navicular drop. Consequently, we accepted hypothesis H01 and rejected hypothesis H02. Additionally, we observed a positive effect of our training program on active ankle mobility, leading us to accept hypothesis H03.
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