Effects of shoe weight on landing impact and side-to-side asymmetry

Wang, I‐Lin; Gao, Jin-Jiang; Wang, Li-I; Zhang, Ke-Ke

doi:10.1371/journal.pone.0256061

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…During the DJ, participants were asked to hold both hands on their waist, jump off from the platform and touch down on both feet simultaneously. After squatting, they jumped upward with maximum effort and as quickly as possible, then landed on the two force plates, respectively [28]. The experiment was divided into 3 different drop heights (DJH)30 cm, DJH40 cm, DJH50 cm, with 7 days intervals in between each different drop height.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Repetitive Drop Jumps among Different Heights on Bilateral Asymmetry of Countermovement Jumps

Wang¹,

Li²,

Su³

et al. 2022

Symmetry

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Background: The study explored the influence of repeated drop jumps (DJs) from different drop heights on the lower extremity bilateral asymmetry and muscle activation of countermovement jumps (CMJs). Methods: Eighteen male athletes performed 200 drop jumps (DJs200) from three drop jump height (DJH30, 40 and 50 cm). The CMJs were performed before the first DJ and after the 50th, 100th, 150th and 200th DJs, recording them as pre-CMJ, CMJs50, CMJs100, CMJs150 and CMJs200. One-way repeated measures ANOVA was used to compare differences among the three drop heights at pre-CMJ, CMJs50, CMJs100, CMJs150 and CMJs200, respectively. Results: The peak ground reaction forces (PGRF) of CMJs100, CMJs150 and CMJs200 at DJH50 were greater than at DJH30 and DJH40 (all p < 0.05). The muscle activation during CMJs50 at DJH50 was greater than at DJH30 and DJH40 (all p < 0.05). The muscle activation during CMJs100, CMJs150 and CMJs200 at DJH50 was smaller than at DJH40 and DJH30 (all p < 0.05). The PGRF had no significant difference among the three different drop heights during CMJs50 (p > 0.05). Conclusions: The DJs50 at DJH50 had no effect on the bilateral asymmetry and increased muscle activation of CMJs. The excessive DJs100 at DJH50 increased bilateral asymmetry and decreased CMJ muscle activation during CMJs.

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Section: Methodsmentioning

confidence: 99%

The Effect of Repetitive Drop Jumps among Different Heights on Bilateral Asymmetry of Countermovement Jumps

Wang¹,

Li²,

Su³

et al. 2022

Symmetry

Self Cite

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“…However, high-impact loading when landing from a jump often causes sports injuries [1][2][3]. Impact loading is measured by the peak ground reaction force (GRF) or the loading rate, which is calculated by dividing the peak GRF by the time to peak GRF [4][5][6]. Recently, the loading rate has received more attention than peak GRF as an indicator of impact loading [7,8].…”

Section: Introductionmentioning

confidence: 99%

The ability to produce a timely explosive force may affect loading rate at landing

et al. 2023

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Background Sports injuries are strongly associated with the impact loading at landing. The abilities to produce force and adjust timing are simultaneously required to absorb impact loading. Aims Hence, we aimed to examine the hypothesis that the ability to produce an explosive force at the right timing is related to the ability to absorb the impact loading at landing. Methods Twenty-nine healthy young men volunteered to participate in the study. We proposed a new test to measure the rate of force development (RFD) in accordance with the countdown signal. To evaluate the ability to produce explosive force at the right time, we measured the rate of change between the RFD at the standard start signal and the RFD at the countdown signal. Furthermore, to evaluate the ability to land from a jump, we measured the loading rate at single-leg drop landing (20 cm). Results We divided the participants into two groups based on the timing effect: the positive group (participants with increased RFD at the countdown signal, n = 11) and the negative group (participants with decreased RFD at the countdown signal, n = 18). The loading rate was significantly greater (P < .01) in the negative group (47.4 ± 11.2 body weight (BW)/s) than in the positive group (34.7 ± 7.1 BW/s). Conclusions Participants with increased RFD at the countdown signal had a lower loading rate at landing. Our results suggest that the ability to produce a timely explosive force may be a determinant of safe landing ability.

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Fluid-filled lattices for responsive orthotic insoles

Cracknell,

Battley,

Fernandez

et al. 2024

Smart Mater. Struct.

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Orthotic insoles are essential for alleviating discomfort and preventing injuries in the foot caused by high peak pressures in the plantar tissue. Traditional orthotic insoles, often prescribed to address these issues, are designed based on the static foot shape and pressure measurements, lacking responsiveness to dynamic movements. This study explores the behaviour of fluid-filled lattices for improving the functionality of orthotic insoles, focusing on energy dissipation and pressure redistribution capabilities. Using numerical homogenisation, the research integrates hyperelastic and permeability models to simulate the behaviour of Solid-Liquid Composites (SLCs). Experimental tests validated these models, examining the influence of fluid viscosity and structural variations on energy dissipation and pressure distribution. Results show that fluid-filled lattices provide enhanced energy dissipation and reduce peak pressures by evening out the pressure distribution compared to non-fluid-filled samples. These findings highlight the potential of fluid-filled lattices to improve the performance and comfort of orthotic insoles.

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Effects of shoe weight on landing impact and side-to-side asymmetry

Cited by 3 publications

References 23 publications

The Effect of Repetitive Drop Jumps among Different Heights on Bilateral Asymmetry of Countermovement Jumps

The Effect of Repetitive Drop Jumps among Different Heights on Bilateral Asymmetry of Countermovement Jumps

The ability to produce a timely explosive force may affect loading rate at landing

Fluid-filled lattices for responsive orthotic insoles

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