Fig. 4.

Comparison of pre-stretch and post-stretch. Post-stretch: 1–2 min (walking trial between 1 and 2 min after post-stretch condition), post-stretch: 3–4 min (walking trial between 3 and 4 min after post-stretch condition). Peak knee flexion (PKF), total knee range, duration in early swing, maximum knee flexion velocity (max KF vel), maximum hip flexion velocity (max HF vel fr/GC), and gait velocity (gait vel m/sec) approached pre-stretch levels over time. Fr: frame, GC: gait cycle, m: meters, N: pre-stretch; S–W: stretch + weight; sec: seconds.