TORSIONAL STIFFNESS AS AN INFLUENCE PARAMETER ON ARCH STABILITY

Influence of Passive Stiffness of Hamstrings on Postural Stability

The aim of the study was to explore whether passive stiffness of the hamstrings influences the strategy of maintaining postural stability. A sample of 50 subjects was selected; the final analyses were based on data of 41 individuals (33 men, 8 women) aged 21 to 29 (mean = 23.3, SD = 1.1) years. A quasi- experimental ex post facto design with repeated measures was used. Categories of independent...

Influence of Shaft Torsional Stiffness on Dynamic Response of Four- stage Main Transmission System

Characterization of Torsional Stiffness in Harmonic Drive

Primarily for aerospace applications, harmonic drives (HD’s) are high-ratio, compact torque transmission systems. This mechanical transmission employs a continuous deflection wave along a non-rigid gear, the socalled ‘flexspline’, to allow gradual engagement of gear teeth. A harmonic drive also contains a wave-generator (a ball-bearing assembly with a rigid elliptical inner-race) and a circular...

Muscle force-stiffness characteristics influence joint stability: a spine example.

BACKGROUND The muscle force-stiffness relationship has often been modeled as linear, while in situ muscle research has clearly demonstrated non-linearity. Estimation of rotational joint stability relies on both a muscle's instantaneous pre-perturbation force and stiffness. Under conditions of static equilibrium, a muscle's stiffness will function in a stabilizing manner, while its force can fun...

Aortic arch stiffness in Fabry disease

Results Aortic arch PWV was significantly increased in FD patients (6.5±3.1vs 5.0 ±1.5 m/s, p<0.01) Compared to control subjects, patients with FD had also markedly decreased distensibility (2.73±1.14 vs 3.45±1.13 10-2 kPa-1, p<0.01) and increased stiffness index beta (9.4 ±6.7.10-2 vs 5.9±2.7.10-2, p<0.001) in the ascending aorta. Descending aortic stiffness parameters were also impaired with ...