Effect of Modified High-heels on Metatarsal Stress in Female Workers

김관태,Hsien-Te Peng 한국운동역학회 2019 한국운동역학회지 Vol.29 No.3

Objective: The purpose of this study was to identify the effect of high-heels (HH) modification on metatarsal stress in female workers. Method: Seven females who work in clothing stores (heights = 160.4±3.9 cm; weights = 47.4± 4.1 kg; age = 31.3±11.1 yrs; HH wear career = 8±6.5 yrs) wore two types of HH (original and modified). The modified HH had been grooved with 1.5 cm radius and 0.2 cm depth around the first metatarsal area inside of the shoes using the modified shoe-last. Participants were asked to walk for 15 minutes on a treadmill and to stand for 10 minutes with original and modified HH, respectively. Kinetics data were collected by the F-scan in-shoe system. After each test, participants were asked to rate their perceived exertion using the Borg's 15-grade RPE scale and interviewed about their feeling of HH. Nonparametric Wilcoxon signed-rank test and effect size (Cohen's d) were used to determine the difference of the variables of interest between the original and modified HH. Results: In the present study, modified HH of the peak contact pressure of 1st metatarsal (PCP) left, PCP right, pressure time integral (PTI) left, peak pressure gradient (PPG) left during standing and PPG right during walking are greater than original HH. And even it didn't show statistically significant, the average in all pressure values of modified HH showed bigger than original HH. It surmised to be related to awkward with modified HH. Even though they said to feel the comfortable cause of big space inside of HH in the interview, they seemed to be not enough time to adapt with new HH. So their walking and standing postures were unstable. Conclusion: Modified the fore-medial part of HH can reduce the stress in the first metatarsal head and big toe area during standing and walking.

Effect of Modified High-heels on Metatarsal Stress in Female Workers

Kim, Kwantae,Peng, Hsien-Te Korean Society of Sport Biomechanics 2019 한국운동역학회지 Vol.29 No.3

Objective: The purpose of this study was to identify the effect of high-heels (HH) modification on metatarsal stress in female workers. Method: Seven females who work in clothing stores ($heights=160.4{\pm}3.9cm$; $weights=47.4{\pm}4.1kg$; $age=31.3{\pm}11.1yrs$; $HH\;wear\;career=8{\pm}6.5yrs$) wore two types of HH (original and modified). The modified HH had been grooved with 1.5 cm radius and 0.2 cm depth around the first metatarsal area inside of the shoes using the modified shoe-last. Participants were asked to walk for 15 minutes on a treadmill and to stand for 10 minutes with original and modified HH, respectively. Kinetics data were collected by the F-scan in-shoe system. After each test, participants were asked to rate their perceived exertion using the Borg's 15-grade RPE scale and interviewed about their feeling of HH. Nonparametric Wilcoxon signed-rank test and effect size (Cohen's d) were used to determine the difference of the variables of interest between the original and modified HH. Results: In the present study, modified HH of the peak contact pressure of 1st metatarsal (PCP) left, PCP right, pressure time integral (PTI) left, peak pressure gradient (PPG) left during standing and PPG right during walking are greater than original HH. And even it didn't show statistically significant, the average in all pressure values of modified HH showed bigger than original HH. It surmised to be related to awkward with modified HH. Even though they said to feel the comfortable cause of big space inside of HH in the interview, they seemed to be not enough time to adapt with new HH. So their walking and standing postures were unstable. Conclusion: Modified the fore-medial part of HH can reduce the stress in the first metatarsal head and big toe area during standing and walking.

Effect of Modified High-heels on Metatarsal Stress in Female Workers

( Kwantae Kim ),( Hsien-te Peng ) 한국운동역학회 2019 한국운동역학회지 Vol.29 No.3

Objective: The purpose of this study was to identify the effect of high-heels (HH) modification on metatarsal stress in female workers. Method: Seven females who work in clothing stores (heights = 160.4±3.9 cm; weights = 47.4±4.1 kg; age = 31.3±11.1 yrs; HH wear career = 8±6.5 yrs) wore two types of HH (original and modified). The modified HH had been grooved with 1.5 cm radius and 0.2 cm depth around the first metatarsal area inside of the shoes using the modified shoe-last. Participants were asked to walk for 15 minutes on a treadmill and to stand for 10 minutes with original and modified HH, respectively. Kinetics data were collected by the F-scan in-shoe system. After each test, participants were asked to rate their perceived exertion using the Borg's 15-grade RPE scale and interviewed about their feeling of HH. Nonparametric Wilcoxon signed-rank test and effect size (Cohen's d) were used to determine the difference of the variables of interest between the original and modified HH. Results: In the present study, modified HH of the peak contact pressure of 1st metatarsal (PCP) left, PCP right, pressure time integral (PTI) left, peak pressure gradient (PPG) left during standing and PPG right during walking are greater than original HH. And even it didn't show statistically significant, the average in all pressure values of modified HH showed bigger than original HH. It surmised to be related to awkward with modified HH. Even though they said to feel the comfortable cause of big space inside of HH in the interview, they seemed to be not enough time to adapt with new HH. So their walking and standing postures were unstable. Conclusion: Modified the fore-medial part of HH can reduce the stress in the first metatarsal head and big toe area during standing and walking.

Effects of Modified Insole on Lower Extremities Biomechanics in College Male Basketball Players

( Kwantae Kim ),( Mi-sun Kim ),( Ki-kwang Lee ),( Hsien-te Peng ) 한국체육학회 2020 International journal of human movement science Vol.14 No.1

The purpose of this study was to investigate the effect of fore-medial-side thin insole on lower extremities kinematics and kinetics in college male basketball players. Seven male college basketball players voluntarily participated in the study (heights= 173.1 ± 3.1 cm; weights= 68.6 ± 5.7 kg; age= 21.1 ± 2.0 yrs.). They wore the same basketball shoes with 2 types of insoles: one type was original insole (OI); another one was fore-medial-side gradually thin insole (TI). Participants were asked to perform L-cut, V-cut, Backdoor-cut, walk, shuttle run of basketball movement in a 5-meter running way with their maximum speed. They were instructed to step with their right leg when they changed direction. The kinematic and kinetic data were collected during support phase. Non-parametric Wilcoxon signed rank test and the effect size were used to determine the difference of the variables of interest between the original and fore-medial-side thin insoles. The fore-medial-side thin insole showed less foot inversion angle at contact, peak ankle lateral shear force and ankle dorsiflexion moment than the original insole in L-cut (p<.05). In V-cut, the fore-medial-side thin insole showed less hip internal rotation at contact than the original insole (p<.05). In the shuttle run, the fore-medial-side thin insole showed less hip abduction at contact than the original insole (p<.05). In case of foot pressure, it showed no statistically significant but had large effect size on left foot’s pressure time integral (PTI), in L-cut (≥0.8), large effect size on left foot’s PCP, PTI, right foot’s PTI in V-cut (≥0.8), large effect size on left foot’s peak contact pressure of 1st metatarsal (PCP), PTI, peak pressure gradient (PPG), right foot’s PTI in BD-cut (≥0.8), large effect size on left foot’s PTI, medium effect size on left foot’s PPG (≥0.5), and medium effect size on left foot’s the distance from the point of peak contact pressure to the medial edge of 1st metatarsal (PCPd) (≥0.5). In conclusion, the fore-medial-side thin insole can help to push our body to the medial side and decrease the risk of injuries of the lower extremity during cutting movements.

The correlation between upper body angles and performance on elite pole vault athletes in Taiwan

Kwan-Tae Kim,Ki-Hong Kim,Ji-Hwan Kang,Hsien-Te Peng 한국운동재활학회 2013 한국운동재활학회 학술대회 Vol.2013 No.1