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Plantar pressure distribution and postural balance in beauty pageant contestants before and after wearing high-heeled shoes

Jaszczur-Nowicki Jarosław, Hasiuk Adrianna Maja, Podstawski Robert, Potocka-Mitan Małgorzata, Ambroży Dorota, Perliński Jacek, Ruzbarska Beata, Bukowska Joanna Magdalena

Acta of Bioengineering and Biomechanics

2022

Vol. 24, no. 3

99--105

The aim of this study was to assess the biomechanics of the foot in beauty pageant contestants wearing shoes that increase calcaneal height. Plantar pressure distribution and postural balance were examined in women after one hour of wearing high-heeled shoes. Methods: Foot arch measurements were conducted using EPSR1. Based on these measurements, 18 of the 19 tested women were diagnosed with significant pes cavus. Results: The experiment revealed a significant reduction in the excessively high metatarsal arch of both feet. The mean load on the metatarsus measured at rest was 0.0% in both feet, and it increased by 0.6% in the left leg ( p ≤ 0.022; Z = 2.293) and by 2.7% in the right leg ( p ≤ 0.023; Z = 2.271). These results suggest that excessive stretching of the plantar fascia and impaired function of the short muscles of the foot lead to a temporary reduction in the arch of the foot. This phenomenon can be compared to stretching a bowstring and its return to the shortest length under static conditions. A statistical analysis of the results of stabilographic measurements revealed significant changes only in the left foot barycenter. An analysis of the ability to maintain postural balance revealed that the observed changes contributed to postural destabilization at p ≤ 0.011 and Z = 2.535. Conclusions: Further research involving electromyography tests is needed to examine plantar muscle tension during isotonic contractions. The duration of the exercise-induced reduction in pes cavus should also be determined for therapeutic purposes.

Distribution of feet pressure on ground and maintaining body balance among 8–10-year-old children with and without external load application

Jaszczur-Nowicki Jarosław, Bukowska Joanna M., Kruczkowski Dariusz, Pieniążek Magdalena, Mańko Grzegorz, Spieszny Michał

Acta of Bioengineering and Biomechanics

2020

Vol. 22, no. 4

93--99

The aim of this study was to analyse the impact of applying an external load on the distribution of pressure on the plantar side of the foot and maintaining body balance, using the podobarographic platform. Methods: The study was conducted on 130 school children aged 8–10: girls (n = 68, body mass = 22.8 ± 6.0 kg, body height = 129.3 ± 7.5 cm) and boys (n = 62, body mass = 31.1 ± 6.5 kg, body height 134.4 ± 7.3 cm). The study involved 2 trials. At first, children stood on the platform assuming a natural position. Then, they put on a 5-kg backpack and stood on the platform once more. Results: The results indicate that after backpack loading, for the total research group of girls and boys, statistically significant differences were found in the distribution of foot force on the ground in the left forefoot ( p = 0.008), metatarsus ( p = 0.000) and heel areas ( p = 0.002). While in the right foot, these differences were noted for the forefoot ( p = 0.024) and metatarsus ( p = 0.000). The results of balance testing were also statistically significant. They concerned measurements of the body barycentre area (cop-bars p = 0.003), the barycentre area of the left foot (l-bars p = 0.034) and the parameter comparing distance to surface ratio (cop-lsf p = 0.000). Conclusions: It may be concluded that prolonged overloading with backpacks affects movement patterns, which may further lead to the acquisition and consolidation of postural defects.