نتایج جستجو برای: leg stiffness

تعداد نتایج: 92261  

Journal: :Journal of sports science & medicine 2015
Josh L Secomb Sophia Nimphius Oliver R L Farley Lina E Lundgren Tai T Tran Jeremy M Sheppard

The purpose of the present study was to determine whether any relationships were present between lower-body muscle structure and, lower-body strength, variables measured during a countermovement jump (CMJ) and squat jump (SJ), and eccentric leg stiffness, in adolescent athletes. Thirty junior male (n = 23) and female (n = 7) surfing athletes (14.8 ± 1.7 y; 1.63 ± 0.09 m; 54.8 ± 12.1 kg) underto...

Journal: :Journal of Biomechanics 2015

Journal: :Medicine & Science in Sports & Exercise 2005

Journal: :Journal of applied biomechanics 2013
Hiroaki Hobara Koh Inoue Kazuyuki Kanosue

Understanding the degree of leg stiffness during human movement would provide important information that may be used for injury prevention. In the current study, we investigated bilateral differences in leg stiffness during one-legged hopping. Ten male participants performed one-legged hopping in place, matching metronome beats at 1.5, 2.2, and 3.0 Hz. Based on a spring-mass model, we calculate...

2001
G. D. Heise M. Bohne E. Bressel

When hopping, kleg increases as surface stiffness decreases (Farley et al., 1998). Adjustments to ankle stiffness were found to be the greatest contributor to changes in kleg, whereas the timing of muscle onset did not change. Hortobagyi and DeVita (2000), however, found significant relationships between muscle preactivition times and leg stiffness when subjects stepped downward. They also repo...

2008
Juergen Rummel Andre Seyfarth

In human and animal running spring-like leg behavior is found. In a spring-mass model, running proves to be self-stable in terms of external perturbations or variations in leg properties (e.g. landing angle). However, biological limbs are not made of springs but, rather, consist of segments where springlike behavior can be localized at joint level. Here, we use a two-segment leg model to invest...

2018
Roy Müller Emanuel Andrada

It is known that humans intentionally choose skipping in special situations, e.g. when descending stairs or when moving in environments with lower gravity than on Earth. Although those situations involve uneven locomotion, the dynamics of human skipping on uneven ground have not yet been addressed. To find the reasons that may motivate this gait, we combined experimental data on humans with num...

Journal: :Journal of biomechanics 2002
Michael Günther Reinhard Blickhan

The spring-mass model is a valid fundament to understand global dynamics of fast legged locomotion under gravity. The underlying concept of elasticity, implying leg stiffness as a crucial parameter, is also found on lower motor control levels, i.e. in muscle-reflex and muscle-tendon systems. Therefore, it seems reasonable that global leg stiffness emerges from local elasticity established by ap...

2015
Ryan Frost Jeffrey Skidmore Marco Santello Panagiotis Artemiadis

Sensorimotor control theories propose that the central nervous system exploits expected sensory consequences generated by motor commands for movement planning, as well as online sensory feedback for comparison with expected sensory feedback for monitoring and correcting, if needed, ongoing motor output. In our study, we tested this theoretical framework by quantifying the functional role of exp...

2010
Sami Kuitunen Harri Suominen

Kuitunen, Sami Muscle and joint stiffness regulation during normal and fatiguing stretchshortening cycle exercise Jyväskylä: University of Jyväskylä, 2010, 76 p. (Studies in Sport, Physical Education and Health, ISSN 0356-1070; 149) ISBN 978-951-39-3969-4 (PDF), 978-951-39-3954-0 (nid.) Finnish summary Diss. The present series of studies were designed to investigate the regulation of leg stiffn...

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