Department of Human Science, Graduate School of Design, Kyushu University , Minami-ku, Fukuoka , Japan.
Department of Human Science, Faculty of Design, Kyushu University , Minami-ku, Fukuoka , Japan.
PeerJ. 2015 Apr 30;3:e928. doi: 10.7717/peerj.928. eCollection 2015.
The effect of wrist flexion-extension on the median nerve appearance, namely the cross-sectional area (MNCSA) and the longitudinal (D1) and vertical (D2) diameters, was investigated among older adults (N = 34). Ultrasound examination was conducted to examine the median nerve at different wrist angles (neutral; and 15°, 30°, and 45° extension and flexion), in both the dominant and nondominant hand. Median nerve behavior were significantly associated with wrist angle changes. The MNCSA at wrist flexion and extension were significantly smaller (P < .001) compared with the neutral position in both the dominant and nondominant hand. The D1 and D2 were significantly reduced at flexion (P < .001) and extension (P < .001), respectively, in both the dominant and nondominant hand. Our results suggest that a larger flexion-extension angle causes higher compression stress on the median nerve, leading to increased deformation of the MNCSA, D1, and D2 among older adults.
研究了老年人（N=34）腕关节屈伸对正中神经外观（即横截面积[MNCSA]和纵向[D1]和垂直[D2]直径）的影响。使用超声检查分别在优势手和非优势手中，在不同的腕关节角度（中立位；15°、30°和 45°伸展和屈曲）检查正中神经。正中神经的行为与腕关节角度的变化显著相关。在优势手和非优势手中，与中立位相比，腕关节伸展和屈曲时 MNCSA 明显较小（P<.001）。在优势手和非优势手中，D1 和 D2 在伸展（P<.001）和屈曲（P<.001）时均显著降低。我们的结果表明，更大的屈伸角度会对正中神经造成更高的压缩应力，导致老年人 MNCSA、D1 和 D2 的变形增加。
