Investigation of the relationship between localized cumulative stress and plantar tissue stiffness in healthy individuals using the in-vivo indentation technique

Yum, Haeun; Eom, So Young; Lee, Yeokyeong; Kim, Jinah; Lee, Jihye; Teoh, Jee Chin; Lee, Taeyong

doi:10.1016/j.jmbbm.2019.06.020

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…Regarding walking duration, the PPG value at 240 mmHg air insole after 20 min of walking in the M1 and M2 regions was higher than that after 10 min of walking ( Table 2 ; Figure 5 ). People who exercise continuously and repetitively are more likely to have stiffer plantar soft tissues ( Yum et al, 2019 ). This study implied that prolonged exercise on a stiffer air insole might induce fatigue that can increase plantar soft tissue stiffness ( Hamatani et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Plantar pressure gradient and pressure gradient angle are affected by inner pressure of air insole

Haris,

Jan,

Liau

et al. 2024

Front. Bioeng. Biotechnol.

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Clinically, air insoles may be applied to shoes to decrease plantar pressure gradient (PPG) and increase plantar gradient angle (PGA) to reduce foot ulcers. PPG and PGA may cause skin breakdown. The effects of different inner pressures of inflatable air insoles on dynamic PPG and PGA distributions are largely unknown in non-diabetics and people with diabetes. This study aimed to explore the impact of varying inner air insole pressures on PPG and PGA to establish early mitigation strategies for people at risk of foot ulcers. A repeated measures study design, including three air insoles (80 mmHg, 160 mmHg, and 240 mmHg) and two walking durations (10 and 20 min) for a total of six walking protocols, was tested on 13 healthy participants (height, 165.8 ± 8.4 cm; age, 27.0 ± 7.3 years; and weight, 56.0 ± 7.9 kg, BMI: 20.3 ± 1.7 kg/m^2) over three consecutive weeks. PPG, a measurement of the spatial variation in plantar pressure around the peak plantar pressure (PPP) and PGA, a variation in the gradient direction values at the three plantar regions, big toe (T1), first metatarsal head (M1), and second metatarsal head (M2), were calculated. This study indicated that PPG was lower at 80 mmHg air insoles after 20 min of walking in the M1 region (p = 0.010). The PGA in the M2 increased at an air insole of 80 mmHg compared to 240 mmHg (p = 0.015). Compared to 20 min, the 10 min walking duration at 240 mmHg of air insole had the lowest PPG in the M1 (p = 0.015) and M2 (p = 0.034) regions. The 80 mmHg air insole significantly lowered the PPG compared to a 160 mmHg and 240 mmHg air insole. Moreover, the 80 mmHg air insole significantly decreased PPP and increased PGA compared to the 160 mmHg and 240 mmHg air insole. A shorter walking period (10 min) significantly lowered PPG. The findings of this study suggest that people with a higher risk of foot ulcers should wear softer air insoles to have a lower PPG, as well as an increased PGA.

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Section: Discussionmentioning

confidence: 99%

Plantar pressure gradient and pressure gradient angle are affected by inner pressure of air insole

Haris,

Jan,

Liau

et al. 2024

Front. Bioeng. Biotechnol.

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show abstract

“…(a) (b) Regarding walking duration, the PPG value at 240 mmHg air insole after 20 min of walking in the M1 and M2 regions was higher than that after 10 min of walking (Table 2, Figure 5). People who exercise continuously and repetitively are more likely to have stiffer plantar soft tissues 49 . This study implied that prolonged exercise on a stiffer air insole might induce fatigue that can increase plantar soft tissue stiffness 50 .…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Inner Pressure of Air Insoles on Plantar Pressure Gradient and Pressure Gradient Angle

Haris,

Jan,

Liau

et al. 2023

Preprint

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Air insoles may be applied to improve peak pressure gradient (PPG) and plantar gradient angle (PGA) for reducing foot ulcers risk in Diabetes mellitus. Dynamic PPG and PGA distributions of air insoles are uncertain. This study investigated the effects of different air insoles on the PPG and PGA. A repeated measures study design, including three air insoles and two walking durations was tested in 13 healthy participants. PPG and PGA values at plantar region of the big toe (T1), first (M1) and second (M2) metatarsal head were calculated. The PPG was lower at 80 mmHg air insoles after walking 20 min in the M1. The PGA in the M2 increased at an air insole of 80 mmHg compared to 240 mmHg. At 240 mmHg of air insole, the 10 min walking had the lowest PPG in M1 and M2. Moreover, peak plantar pressure (PPP) correlated positively with PPG for all air insoles. PPP and PGA were negatively correlated with 80 mmHg air insoles after 20 min of walking. 80 mmHg air insole lowered the PPG, decreased PPP and increased PGA compared to 160 and 240 mmHg. A shorter walking duration lowered the PPG. Air insoles might decrease foot ulcers risk by concerning PPG and PGA.

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Investigation of the relationship between localized cumulative stress and plantar tissue stiffness in healthy individuals using the in-vivo indentation technique

Cited by 2 publications

References 36 publications

Plantar pressure gradient and pressure gradient angle are affected by inner pressure of air insole

Plantar pressure gradient and pressure gradient angle are affected by inner pressure of air insole

Effects of Different Inner Pressure of Air Insoles on Plantar Pressure Gradient and Pressure Gradient Angle

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