Farina, et al published an article showing that the EMG can give reliable indications of muscle activity and fatigue. A previous study of muscle activity using surface EMG noted that based on visual inspections, all surface EMG variables showed consistent linear to moderately curvilinear behavior as a function of time (Muhammed, et al). Surface EMG has been widely used and accepted however care must be taken in pad placement as incorrect placement will give readings of improper musculature, as concluded in a study by Susan Mercer.