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- Title
Determinant of leg stiffness during hopping is frequency-dependent.
- Authors
Hobara, Hiroaki; Inoue, Koh; Omuro, Kohei; Muraoka, Tetsuro; Kanosue, Kazuyuki
- Abstract
Identifying the major determinant of leg stiffness during hopping would be helpful in the development of more effective training methods. Despite the fact that overall leg stiffness depends on a combination of the joint stiffness, it is unclear how the major determinants of leg stiffness are influenced by hopping frequency. The purpose of this study was to identify the major determinant of leg stiffness over a wide range of hopping frequencies. Fourteen well-trained male athletes performed in a place hopping on two legs, at three frequencies (1.5, 2.2 and 3.0 Hz). We determined leg and joint stiffness of the hip, knee and ankle from kinetic and kinematic data. Multiple linear regression analysis revealed that knee stiffness could explain more of the variance of leg stiffness than could ankle or hip stiffness at 1.5 Hz hopping. Further, only ankle stiffness was significantly correlated with leg stiffness at both 2.2 and 3.0 Hz, and the standardized regression coefficient of ankle stiffness was higher than that of knee and hip stiffness. The results of the present study suggest that the major determinant of leg stiffness during hopping switches from knee stiffness to ankle stiffness when the hopping frequency is increased.
- Subjects
JOINT stiffness; LEG; HOPPING (Locomotion); STRETCH reflex; PLYOMETRICS; KNEE physiology; LEG physiology; ANKLE physiology; COMPARATIVE studies; DYNAMICS; ELASTICITY; EXERCISE tests; RANGE of motion of joints; KINEMATICS; RESEARCH methodology; MEDICAL cooperation; MOTION; RESEARCH; TIME; EVALUATION research; BODY movement; PHYSIOLOGY
- Publication
European Journal of Applied Physiology, 2011, Vol 111, Issue 9, p2195
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-011-1853-z