Effect of lower limb kinetic on carrying infant by hip seat carrier during high heel gait
Seung-Hyun Hyun1, Che-Cheong Ryew1
1Department of Kinesiology, College of Natural Science, Jeju National University, Jeju, Korea.
Insights
Wearing high heels while carrying an infant alters leg mechanics, increasing leg stiffness and forces. This posture change may enhance stability but could lead to fatigue and increased fall risk.
Area of Science:
- Biomechanics
- Human Movement Analysis
- Ergonomics
Background:
- High heels and carrying infants individually affect the center of gravity.
- The combined effect on leg mechanics, particularly leg stiffness, during gait is not well understood.
Purpose of the Study:
- To investigate the interaction effect of carrying an infant using a hip seat carrier on leg mechanics during high heel gait.
- To analyze changes in ground reaction forces, center of pressure, and leg stiffness.
Main Methods:
- Nine adult females and nine infants participated.
- Infants were positioned on the rear of the trunk while participants wore 6 cm high heel shoes.
- Leg mechanics were analyzed using ground reaction force variables, extrapolated center of mass (XCoM) theta, and leg stiffness.
Main Results:
- Carrying an infant in high heels significantly increased the first and second peak vertical forces (PVF) and leg stiffness compared to normal gait.
- Medial-lateral center of pressure and XCoM theta were decreased.
- The combined condition induced postural adjustments for stability, potentially reducing impulse.
Conclusions:
- High heel gait combined with carrying an infant may lead to accumulated leg fatigue and an increased risk of falling injuries.
- Understanding these biomechanical mechanisms is crucial for clinicians and exercise rehabilitation specialists to develop appropriate exercise guidelines.
Abstract:
While common characteristics between wearing of high heel between carrying an infant elevate height of center of gravity, it is not known what interaction effect influence to leg stiffness. The aim of the study is to investigate the effect of carrying infant by hip seat carrier on leg mechanics during high heel gait. Adult female (n=9) and infant (n=9) participated as subjects. Infant was positioned on rear of trunk as of wearing 6 cm of high heel shoe. Change of leg mechanics was analyzed with ground reaction force variables (1st peak vertical force [PVF], 2nd PVF, center of pressure [medial-lateral, anterior-posterior]), extrapolated center of mass (XCoM) theta, and leg stiffness. While carrying infant with wearing of high heel more increased 1st PVF, 2nd PVF, and leg stiffness than normal gait, and more decreased medial-lateral center of pressure and XCoM theta. High heel and carrying infant showed potential transformation of posture for securement of stability, which related with mechanism to decrease an impulse type. In conclusion, it is suggest that gait for long time in the condition may accumulate fatigue on leg and increase falling injury, so experts of clinics and exercise rehabilitation should understand the mechanism that could recommend guideline for exercise prescription on several problems.
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