If rate of loading is decreased, the mechanical properties of material:

Mechanical events are both temperature and time dependant. As the temperature increases, the mechanical property values decrease. The stress strain curve appears to move to the right and downward. The opposite occurs  during cooling. As the rate of loading decreases, the mechanical properties decrease. This is called 'Strain rate sensitivity' and has important clinical implications. To momentarily make a material's behaviour stiffer or elastic, strain it quickly. Eg.: Remove elastic impressions rapidly so that it will be more elastic and more accurately records the absolute dimensions.