The PNF was performed as follows: (a) the lower limb (flexion) is led in the direction of ischiotibial stretching up to the flexion limit; (b) a maximum concentric contraction (but isometric by the trainer's resistance) of the agonist (ischiotibial) was performed for 8 sec; and (c) the researcher then gave the command to "relax" and after 3 sec the segment was conducted passively to the new limit to increase ROM.
(15) with respect to gains in ischiotibial muscle flexibility after PNF training.
Then, it takes a descending path as a single fascicle (Greene, 1963), above the obturator externus, quadratus femoris, biceps femoris, and adductor magnus muscles, giving off collateral branches to the ischiotibial
muscles (proximal portion of the sciatic nerve).
The stretching techniques included the upper fibers of trapezius muscles, sternocleidomastoid, posterior fibers of the deltoid, triceps brachial, rhomboid, pectoral, large dorsal, quadriceps, ischiotibial and adductors.
The inability to maintain significant knee extension angles beyond three minutes suggests that a temporary effect occurred in the viscoelastic component of the ischiotibial muscles, which was not deformed enough to produce a permanent change (DEPINO et al., 2000).
For this procedure, one of the tendons of the ischiotibial
muscles is used.