They found that «sitting back» led to much reduced rectus
femoris EMG amplitude and slightly greater gluteus maximus and hamstrings EMG amplitudes.
Bourne et al. (2015) found that the Nordic hamstring curl produced preferentially higher semitendinosus EMG amplitude; but again, Zebis et al. (2013) did not report any preferential activation; Mendiguchia et al. (2013a) reported preferential biceps (short head) activation; and Ditroilo et al. (2013) reported that biceps
femoris EMG amplitude exceeded maximum voluntary eccentric contraction levels by some margin.
Not exact matches
Ono et al. (2010) found that
EMG amplitude of the semitendinosus was significantly higher than that of the semimembranosus during eccentric leg curls and Kubota et al. (2007) found that muscular soreness and signal intensity was greatest in the order semitendinosus > biceps
femoris (long head) > semimembranosus following eccentric leg curls.
Ono et al. (2011) assessed hamstrings
EMG amplitude during a stiff - legged deadlift and reported that the
EMG amplitudes of the biceps
femoris and of the semimembranosus were significantly higher than that of the semitendinosus.
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).
Savelberg et al. (2007) found that as the load increased in a sit - to - stand movement, the
EMG amplitude of most of the lower body muscles increased accordingly, although the increase in the
EMG amplitude of the biceps
femoris was less marked than that of the other muscles and only significantly increased with the largest load increment.
Surface
EMG recording electrodes (MediTrace Pellet Ag / AgCl electrodes, disc shape, and 10 mm in diameter, Graphic Controls Ltd., Buffalo, NY, USA) were placed over the muscle belly of the rectus
femoris, measured by half the distance between the anterior superior iliac spine and the patella, as suggested by Mesin et al. (21).