The effect of speed on leg stiffness and joint kinetics in human running
A Arampatzis, G P Brüggemann & Verena Metzler
|
abstract
|
The goals of this study were to examine the following hypotheses:
(a) there is a difference between the theoretically calculated
(McMahon and Cheng, 1990. Journal of Biomechanics 23, 65-78) and the
kinematically measured length changes of the spring-mass model and
(b) the leg spring stiffness, the ankle spring stiffness and the
knee spring stiffness are influenced by running speed. Thirteen
athletes took part in this study. Force was measured using a
"Kistler" force plate (1000 Hz). Kinematic data were
recorded using two high-speed (120 Hz) video cameras. Each athlete
completed trials running at five different velocities (approx. 2.5,
3.5, 4.5, 5.5 and 6.5 m/s). Running velocity influences the leg
spring stiffness, the effective vertical spring stiffness and the
spring stiffness at the knee joint. The spring stiffness at the
ankle joint showed no statistical difference (p < 0.05) for the
five velocities. The theoretically calculated length change of the
spring-mass model significantly (p < 0.05) overestimated the
actual length change. For running velocities up to 6.5 m/s the leg
spring stiffness is influenced mostly by changes in stiffness at the
knee joint.
|
| |
|
|
citation
|
Arampatzis A, Brüggemann G P, metzler v. The effect of speed on leg
stiffness and joint kinetics in human running. Journal of
biomechanics 1999; 32:1349-53.
|
| |
|
|
type
|
journal paper/review (English)
|
|
date of publishing
|
12-1999
|
|
journal title
|
Journal of biomechanics (32/12)
|
|
ISSN print
|
0021-9290
|
|
pages
|
1349-53
|
|
PubMed
|
10569714
|
additional links & downloads
