Simulation study of the importance of biarticular muscles on human vertical jump performance

Prokopow, Przemyslaw; Pomorski, Krzysztof

doi:10.1504/ijecb.2011.039945

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…Different theoretical models have been used to analyse the mechanics and performance of vertical jumps (Bobbert, 2010; Bobbert & Casius, 2011; Bobbert, Casius, & Kistemaker, 2013; Prokopow, Hay, Fukashiro, & Himeno, 2005). Simple models have been used to study general principles without considering anatomical and physiological details (McMahon & Cheng, 1990), while more complex models are required to analyse the action of specific components of the neuromuscular system (Bobbert et al., 2013; Pandy, 2001; Prokopow et al., 2005).…”

Section: Introductionmentioning

confidence: 99%

Differences in the utilisation of active power in squat and countermovement jumps

Ferraro

Fábrica

2017

European Journal of Sport Science

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The aim of this article was to understand how active power is used in squat and countermovement jumps. A simple empirical model comprising a mass, a spring, an active element and a damper, together with an optimisation principle, was used to identify the mechanical factors that maximise performance of jumps without countermovement (squat jumps, SJ) and with countermovement (CMJ). Twelve amateur volleyball players performed SJ from two initial positions and CMJ with two degrees of counterbalancing, while kinematic data were collected (jump height, push-off duration and position of the centre of mass). The model adjusted well to real data of SJ through all the impulse phase, and slightly less adequately at the end of this phase for CMJ. Nevertheless, it provides a satisfactory explanation for the generation and utilisation of active power for both type of jumps. On average, the estimated power of the active elements, the spring, and the damper were greater in the SJ. Based upon the result obtained with this model, we suggest that active power is best evaluated with SJ. The reason for this is that, during this kind of jump, the elements associated with the damper consume much of the energy produced by the active elements. The participation of the elements that consume the energy generated by the active elements is less in CMJ than in SJ, allowing for a better utilisation of this energy. In this way it is possible to achieve a better performance in CMJ with less active power.

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Section: Introductionmentioning

confidence: 99%

Differences in the utilisation of active power in squat and countermovement jumps

Ferraro

Fábrica

2017

European Journal of Sport Science

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“…A forward dynamics computer simulation that was developed and validated in previous studies [9][10][11] was also used in this study. An independent neural input (represented as the set of activation patterns of all the muscles) was used as the simulation's input and the jump dynamics were calculated as an output.…”

Section: Methodsmentioning

confidence: 99%

The Effects of Muscle Strengthening on Neuro-Musculo-Skeletal Dynamics in A Squat Jump: A Simulation Study

Prokopow¹

2011

Human Movement

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Purpose. The aim of this study was to quantitatively investigate the effects of muscle strengthening in a vertical squat jump based on a neuro-musculo-skeletal model and a forward dynamics simulation. Methods. During simulation trials, 16 major muscle groups of the lower extremities were gradually strengthened up to 20%. Results. Complex yet systematic deviations in body kinematics, kinetics and the neural control pattern were observed as a result of gradual muscle strengthening. Conclusions. based on the generated results it was concluded that: (i) the pattern of kinematical changes depends on which muscles are strengthened, while the magnitude of the changes depends on how much the muscles are strengthened. (ii) Adjustment of muscle coordination, in some cases, can be performed without adjustment of neural control. (iii) The adjustment of neural control is done in an adaptive manner. (iv) Inter-segmental coordination is further altered if a smaller number of muscles are strengthened. (v) The main effect of equally strengthening all the muscles is an increase in joint torque, which is proportional to the increase in muscle strength.

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Simulation study of the importance of biarticular muscles on human vertical jump performance

Cited by 2 publications

References 11 publications

Differences in the utilisation of active power in squat and countermovement jumps

Differences in the utilisation of active power in squat and countermovement jumps

The Effects of Muscle Strengthening on Neuro-Musculo-Skeletal Dynamics in A Squat Jump: A Simulation Study

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