نتایج جستجو برای: leg stiffness
تعداد نتایج: 92261 فیلتر نتایج به سال:
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...
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...
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...
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...
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...
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...
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...
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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