Is the “impact factor” a valid measure of the impact of research published in Clinical Neurophysiology and Muscle & Nerve?

Is the “impact factor” a valid measure of the impact of research published in Clinical Neurophysiology and Muscle & Nerve?

Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Clinical Neurophysiology - Volume 123, Issue 9, September 2012, Pages 1687-1690

David Burke, Lawrence H. II,