Assessments of skin elasticity parameters , ie , the three R-parameters ( R2 or gross-elasticity of the skin , R5 or net elasticity of the skin , and R7 or biological elasticity ) , and the resonance running time ( RRT ) at both volar forearms of the two groups were performed during three visits : before starting oils consumption and application , after 30 days of oils consumption and application , and after 60 days of oils consumption and application .