Neural and Mechanical Adaptations During Static Stretching With Different Amplitudes

This study examined neural and mechanical responses at the onset of prolonged static stretching performed at different amplitudes, their progression during the stretching period, and alterations immediately after its completion. Thirteen healthy adults completed three randomized sessions: control (15-min rest in neutral ankle angle), 15 min of submaximal stretching (ROMmax - 5°), and 15 min of supramaximal stretching (ROMmax + 5°). Spinal excitability (Hmax/Mmax), evoked contractile properties (PTT), voluntary strength (MVC), passive torque, and maximal range of motion (ROMmax) were assessed at baseline (PRE), during stretching (T00, T05, T10, and T15), and immediately after stretching (POST). Spinal excitability decreased at stretch onset but progressively increased during stretching (T00-T15, p max improved in both (p max gains at supramaximal amplitude.