Jenkins et al. (2015) found that the reliability of
EMG amplitude was high during a 1RM knee extension test for the rectus femoris, vastus lateralis, and vastus
medialis during (ICC = 0.88, 0.83 and 0.94) and similarly high for the same measure of
EMG amplitude measured during MVIC knee extension (ICC = 0.81, 0.86 and 0.78).