Valderrabano Victor, Nigg Benno M, Hintermann Beat, Goepfert Beat, Dick Walter, Frank Cyril B, Herzog Walter, von Tscharner Vinzenz
Human Performance Laboratory and Orthopaedic Department, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N1N4, Canada.
Foot Ankle Int. 2007 Feb;28(2):242-9. doi: 10.3113/FAI.2007.0242.
The purpose of this study was to determine whether muscular asymmetries were present in the lower legs of recreationally active middle-aged people grouped by leg dominance.
Twelve healthy middle-aged subjects were analyzed bilaterally. The clinical variables included leg dominance, sports level, range of motion, lower leg alignment, calf circumference, and AOFAS (American Orthopaedic Foot and Ankle Society) ankle score. The biomechanical variables included maximal voluntary isometric ankle joint torque and surface electromyography (EMG) with determination of mean EMG frequency and intensity of four lower leg muscles: anterior tibial (AT), medial gastrocnemius (MG), soleus (SO), and peroneus longus (PL).
The mean EMG frequency was significantly lower in the dominant leg for the AT (dominant, 148.6 Hz; nondominant, 157.8 Hz) and MG muscles (dominant, 183.9 Hz; nondominant, 196.8 Hz). A significantly higher plantarflexion torque was found in the dominant leg (27.1 Nm) compared to the nondominant leg (22.9 Nm). Higher (not significant) dorsiflexion torque was found in the dominant leg (dominant, 27.3 Nm; nondominant, 24.8 Nm). The calf circumference was marginally significantly higher (p =0.039) in the dominant leg (34.2 cm; nondominant leg, 33.8 cm). The dominant leg had a higher but not significantly different mean EMG intensity for all four muscles.
Differences in muscle EMG and torque were found between the dominant and nondominant lower leg. These results might be applicable to treatment, rehabilitation, and future research of lower leg and foot and ankle disorders.
本研究的目的是确定按腿部优势分组的休闲活动中年人的小腿是否存在肌肉不对称。
对12名健康中年受试者的双侧进行分析。临床变量包括腿部优势、运动水平、活动范围、小腿对线、小腿围度和美国矫形足踝协会（AOFAS）踝关节评分。生物力学变量包括最大自主等长踝关节扭矩和表面肌电图（EMG），并测定四块小腿肌肉的平均肌电图频率和强度：胫骨前肌（AT）、腓肠肌内侧头（MG）、比目鱼肌（SO）和腓骨长肌（PL）。
AT肌（优势侧，148.6Hz；非优势侧，157.8Hz）和MG肌（优势侧，183.9Hz；非优势侧，196.8Hz）在优势腿的平均肌电图频率显著更低。与非优势腿（22.9Nm）相比，优势腿的跖屈扭矩显著更高（27.1Nm）。优势腿的背屈扭矩更高（不显著）（优势侧，27.3Nm；非优势侧，24.8Nm）。优势腿的小腿围度略高（p=0.039）（34.2cm；非优势腿，33.8cm）。优势腿所有四块肌肉的平均肌电图强度更高，但差异不显著。
优势和非优势小腿之间存在肌肉肌电图和扭矩差异。这些结果可能适用于小腿及足踝疾病的治疗、康复和未来研究。
