“…The value of 207 kN m-2 for the specific F. of MGN muscles in adult rats is slightly lower than the value for most hindlimb muscles of rats (Eddinger, Moss & Cassens, 1985), or mice (Brooks & Faulkner, 1988). The lower value for specific F. results from the large angle of pennation for MGN muscle (Brooks & Faulkner, 1988;Ashton-Miller, He, Kadhiresan, McCubbrey & Faulkner, 1992) and the large aponeurosis (Holewijn, Plantinga, Woittiez & Huijing, 1984). After correcting for the 21 deg angle of pennation (Spector, Gardiner, Zernicke, Roy & Edgerton, 1980), and for the mass of the aponeurosis, the specific Fo increases to a value of 233 kN m-2, a value similar to that obtained for most hindlimb muscles of rodents (Brooks & Faulkner, 1988).…”