منابع مشابه
Muscle Preactivation and Leg Stiffness in Men and Women during Hopping
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...
متن کاملThe Relationship Between Core Stability and Leg Stiffness in Male and Female Athletes
Purpose: Core stability and leg stiffness are two determinant mechanisms in athletic performance and risk injury. This study aimed to investigate the gender differences and relationship of these two factors in athletes. Methods: In this cross-sectional study, core stability and leg stiffness of 12 male and 12 female Iranian squash players at national level were examined utilizing McGill’...
متن کاملInteraction of leg stiffness and surfaces stiffness during human hopping.
When mammals run, the overall musculoskeletal system behaves as a single linear "leg spring". We used force platform and kinematic measurements to determine whether leg spring stiffness (k(leg)) is adjusted to accommodate changes in surface stiffness (ksurf) when humans hoop in place, a good experimental model for examining adjustments to k(leg) in bouncing gaits. We found that k(leg) was great...
متن کاملInteraction of leg stiffness and surface stiffness during human hopping
Ferris, Daniel P., andClaire T. Farley. Interaction of leg stiffness and surface stiffness during human hopping. J. Appl. Physiol. 82(1): 15–22, 1997.—When mammals run, the overall musculoskeletal system behaves as a single linear ‘‘leg spring.’’We used force platform and kinematic measurements to determine whether leg spring stiffness (kleg) is adjusted to accommodate changes in surface stiffn...
متن کاملA Biarticulated Robotic Leg for Jumping Movements: Theory and Experiments
This paper investigates the extent to which biarticular actuation mechanisms—springdriven redundant actuation schemes that extend over two joints, similar in function to biarticular muscles found in legged animals—improve the performance of jumping and other fast explosive robot movements. Robust numerical optimization algorithms that take into account the complex dynamics of both the redundant...
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ژورنال
عنوان ژورنال: Medicine & Science in Sports & Exercise
سال: 2005
ISSN: 0195-9131
DOI: 10.1249/01.mss.0000158991.17211.13