This study aimed to clarify the effective stretching positions for neck extensor muscles. Fifteen healthy men were measured shear moduli of the right neck extensor muscles using ultrasound shear wave elastography in following positions: rest (Rest), flexion (Flex), contralateral bending (Bend), flexion + contralateral bending (Flex → Bend), flexion + contralateral bending + contralateral rotation (Flex → Bend → ConRot), and flexion + contralateral bending + ipsilateral rotation (Flex → Bend → IpsRot). The increase in the shear modulus indicated a greater muscle elongation. Regarding the upper trapezius and splenius capitis, the shear moduli at Flex → Bend, Flex → Bend → ConRot, and Flex → Bend → IpsRot were significantly higher than those at Rest. The shear moduli at stretching positions, including contralateral bending, were significantly higher than those at Rest and Flex in the levator scapulae. The results indicated that the stretching position with a combination of flexion and contralateral bending could be effective for elongation of the upper trapezius and splenius capitis. Furthermore, the stretching positions including contralateral bending could be effective for the levator scapulae.

本研究旨在阐明颈部伸肌的有效拉伸姿势。15 名健康男性在以下位置使用超声剪切波弹性成像测量了右侧颈部伸肌的剪切模量：休息 (Rest)、屈曲 (Flex)、对侧弯曲 (Bend)、屈曲 + 对侧弯曲 (Flex → Bend)、屈曲 +对侧弯曲+对侧旋转（Flex→Bend→ConRot），屈曲+对侧弯曲+同侧旋转（Flex→Bend→IpsRot）。剪切模量的增加表明更大的肌肉伸长。对于斜方肌上部和头脾，Flex→Bend、Flex→Bend→ConRot和Flex→Bend→IpsRot处的剪切模量显着高于Rest时的剪切模量。拉伸位置的剪切模量，包括对侧弯曲，在肩胛提肌中，显着高于休息和屈曲时。结果表明，屈曲和对侧弯曲相结合的拉伸体位对斜方肌上部和头脾的伸长有效。此外，包括对侧弯曲在内的拉伸姿势可能对提肌肩胛骨有效。