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Impact of body weight on shifting of foot pressure among adult subjects

Youssef Enas F., Shanb Alsayed A., Ameer Mariam A., Shanab Mahmoud E.

Acta of Bioengineering and Biomechanics

2020

Vol. 22, no. 2

131--137

Purpose: The aim of the study was to compare the distribution of foot plantar pressure between normal and obese adult subjects during walking. Methods: Sixty male and female adult volunteers (aged 20–40) were recruited into the study. They were equally divided into 30 normal subjects (BMI = 18.5–22.9 kg/cm2 ) into group I and 30 obese subjects (BMI ≥ 25.0 kg/cm2 ) into group II, according to their BMI. Results: There were statistically significant differences between normal and obese subjects in foot length, width, and pressure distribution in the hindfoot, midfoot, forefoot, and toes. There was a statistically significant increase in the plantar pressure of all measured areas in obese persons in comparison with the normal subjects. In addition, all measures of foot pressure showed statistically significant differences between the same sex of both groups, while the obese subjects of both genders have higher foot pressure in all measured areas. High positive correlations were detected between BMI, peak pressure, foot contact, and foot width in both groups, but there was a weak positive correlation between normal BMI and foot contact area. Conclusion: The distribution of plantar foot pressure is different in adult obese subjects than in normal adult subjects during walking activity. The obese persons have larger foot length, width, higher peak pressure, and contact area. This study can help physical therapists to understand the differences of foot pressure between normal and obese subjects, and consequently, to detect any expected foot abnormalities accompanied by obesity.

Determination of Energy Absorption on Seat Regions of Footwear for the Obese

Mathivanan Selvaraj, Mohan Ranganathan, Balachander Palanisami

Fibres & Textiles in Eastern Europe

2019

Vol. 27, no. 4 (136)

76--80

Ideal footwear with a design configuration is necessitated as a tool of rehabilitation to render therapeutic benefits, especially for obese individuals who are experiencing greater risk during locomotion. Energy absorption is found to depend on variables like heel height, slope angle and load exerted by the body mass index. Statistical analysis was carried out to formulate a predictive equation for absorbed energy. It was found that a heel height of 30 mm offers an optimum base for further design of footwear. A coefficient of determination (R2) with a value of 0.933 indicates that the model fits the experimental data nicely. Hence, 30 mm 20 degree is suggested for designing ideal footwear as it enables load dissipation and energy absorption to render foot-comfort benefits and advantages to the user.

Zaprojektowanie idelanego obuwia jest niezbędne jako skuteczne narzędzie rehabilitacji osób otyłych. Stwierdzono, że absorpcja energii w obuwiu zależy od zmiennych, takich jak: wysokość pięty, kąt nachylenia oraz obciążenie wywierane przez wskaźnik masy ciała. Przeprowadzono analizę statystyczną, aby sformułować równanie predykcyjne dla pochłoniętej energii. Stwierdzono, że wysokość obcasa 30 mm stanowi optymalną podstawę do dalszego projektowania obuwia. Współczynnik determinacji (R2) o wartości 0,933 wskazuje, że model pasuje do danych eksperymentalnych. Stwierdzono, że 30 mm wysokości obcasa i kąt nachylenia 20 stopni są optymalne do zaprojektowania idealnego obuwia. Dobór takich parametrów umożliwia dobre rozpraszanie obciążenia i pochłanianie energii zapewniając tym samym komfort użytkowania.