Variation of the critical buckling torque (mean ± SD; n = 6, top panel) and critical buckling twist angle (mean ±SD; normalized to stretched vessel length, n = 6, bottom panel) of porcine IJVs with axial stretch ratio for lumen pressures of 6, 10, and 15 mmHg. The axial stretch ratio significantly affected the critical buckling twist angle (p < 0.001) but had no effect on the critical buckling torque (p = 0.242).