Operation Manual

MyotonPRO User Manual
Page 103 of 108
VISCO-ELASTIC PROPERTIES
R – Mechanical Stress Relaxation Time [ms]
is the time for a muscle to restore its shape from deformation after a voluntary contraction or an
external force is removed.
Figure 5 on Appendix 2, Mechanical Stress Relaxation Time is the time between maximum
deformation t
1
and zero deformation t
R
.
C – Creep
is the gradual elongation of a muscle over time when placed under a constant tensile stress. This
is the ratio of the Mechanical Stress Relaxation Time and the time to cause maximum
deformation by an external force.
Figure 5 on Appendix 2, Creep is the ratio between the Mechanical Stress Relaxation time R and
deformation time t
1
minus t
T
.
* Y. C. Fung Biomehanics „Mechanical Properties of Living Tissues“, p 41; N. Özkaya, M. Nordin
„Fundamentals of Biomechanics, Equilibrium, Motion, and Deformation“ 2nd edition, p 3; K. A.
Athanasiou and R. Natoli „Introduction to Continuum Biomechanics“, p 139.