An Effect of the Elastic Energy Stored in the Muscle-Tendon Complex at Two Different Coupling-Time Conditions during Vertical Jump

Kim, Sukwon

doi:10.4236/ape.2013.31002

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…The data of the present study report that children do not present statistical differences between the SJ and the CMJ, while the adolescent group obtained better performance for the CMJ (Figure 1). The main difference between the actions of the jump is the eccentric action in the CMJ, whereas the period in isometry in the SJ dissipates the energy in the form of heat 21 before the concentric action. Literature reports that adults can improve their jumping performance by 18-30% with SSC action, while children only improve by about 1-5% 5,22 .…”

Section: Discussionmentioning

confidence: 99%

The stretch-shortening cycle efficiency is dependent on the maturational stage

Dantas

Queiros

Fonseca

et al. 2020

Rev. bras. cineantropom. desempenho hum.

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Maturation interferes with physiological and mechanical aspects of muscle contraction. The aim of the present study was to compare the efficiency of the stretch-shortening cycle (SSC) between different maturation stages. One hundred forty six young people, with 72 boys and 74 girls, were recruited to participate in the study. Sexual maturation was measured and the group was stratified into adolescents (> 3 auto-tanner) and children (<2 auto-tanner). Squat jump (SJ) and countermovement jump (CMJ) performance were measured to measure reactive force (RF) capacity, eccentric utilization ratio (EUR) and pre-stretch augmentation (PSAP). The children did not present statistical difference between SJ and CMJ (t(55)= -1.93; ∆ = -0.61; 95% CI = -1.24 to -0.02; p = 0.058), while the adolescents presented higher performance of CMJ (t(89)= -12.28; ∆ = -2.44; 95% CI = -2.84 to -2.05; p <0.001). In addition, adolescents had higher RF performance (t(144)= 5.18; p <0.0001; 95% CI = 2.53 to 1.13), PSAP (t(144)= 4.38; p <0.0001; 95% CI = 14.00 to 5.29) and EUR (t(144)= 4.38; p <0.0001; 95% CI = 0.14 to 0.05). We conclude that more mature young people have better SSC utilization.

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Section: Discussionmentioning

confidence: 99%

The stretch-shortening cycle efficiency is dependent on the maturational stage

Dantas

Queiros

Fonseca

et al. 2020

Rev. bras. cineantropom. desempenho hum.

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“…Energy transfer efficiency is defined as the ratio of stored elastic energy in muscle-tendon complex or ESR (represented by CM displacement during stance phase) to mechanical work represented by height of following jump [33]. The energy return rate is evaluated as an aspect of energy consumption [34].…”

Section: Energy Transfer Efficiencymentioning

confidence: 99%

Simulation of gait asymmetry and energy transfer efficiency between unilateral and bilateral amputees

et al. 2016

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Efficient walking or running requires symmetrical gait. Gait symmetry is one of the key factors in efficient human dynamics, kinematics and kinetics. The desire of individuals with a lower-limb amputation to participate in sports has resulted in the development of energy-storingand-returning (ESR) feet. This paper analyses a case study to show the effect of symmetry and asymmetry as well as energy transfer efficiency during periodic jumping between simulated bilateral and unilateral runners. A custom gait analysis system is developed as part of this project to track the motion of the body of a physically active subject during a set of predefined motions. Stance and aerial times are accurately measured using a high speed camera. Gait frequency, the level of symmetry and the non-uniform displacement between left and right foot and their effects on the position of the Centre of Mass (CM) were used as criteria to calculate both peak energies and transformation efficiency. Gait asymmetry and discrepancy of energy transfer efficiency between the intact foot and the ESR are observed. It is concluded that unilateral runners require excessive effort to compensate for lack of symmetry as well as asymmetry in energy transfer, causing fatigue which could be a reason why bilateral amputee runners using ESR feet have a superior advantage over unilateral amputees.

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An Effect of the Elastic Energy Stored in the Muscle-Tendon Complex at Two Different Coupling-Time Conditions during Vertical Jump

Cited by 2 publications

References 24 publications

The stretch-shortening cycle efficiency is dependent on the maturational stage

The stretch-shortening cycle efficiency is dependent on the maturational stage

Simulation of gait asymmetry and energy transfer efficiency between unilateral and bilateral amputees

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