Whether the adductor
magnus displays greater EMG activity in greater degrees of hip flexion is unclear.
Dostal et al. (1986) reported that the adductor
magnus displayed muscle moment arm lengths of -0.3 cm (i.e. external rotation) and 0.4 cm (i.e. internal rotation) for the middle and posterior portions, respectively.
However, the adductor
magnus displayed a much greater moment arm length in 90 degrees of hip flexion than in full hip extension, which may indicate that this muscle has an important contributory role to hip extension moment in this position.
Although Pressel and Lengsfeld (1998), Arnold et al. (2000), and Arnold and Delp (2001) did not provide actual numbers for their studies, they all found that the adductor
magnus displayed a very small transverse plane moment arm that is probably not meaningful.
Not exact matches
The adductor
magnus, adductor longus, adductor brevis and pectineus
display similar fascicle lengths, while the gracilis is much longer and the obturator externus is much shorter.
The adductor
magnus, adductor longus, adductor brevis and pectineus
display lengths of around 10 — 14 cm (Friederich & Brand, 1990; Horsmann et al. 2007; Ward et al. 2009).