Cordova M L, Armstrong C W, Rankin J M, Yeasting R A
Athletic Training Department, Indiana State University, Terre Haute 47809, USA. m-cordova@.indstate.edu
Med Sci Sports Exerc. 1998 Sep;30(9):1363-70. doi: 10.1097/00005768-199809000-00004.
The purpose of this investigation was to evaluate the effects of external ankle support on ground reaction forces and myoelectrical activity of selected lower extremity muscles during dynamic inversion stress.
Twenty-four healthy males performed five trials of a lateral dynamic movement at a rate between 80-90% of their maximal speed under three ankle brace conditions (no brace--control, Aircast Sport-Stirrup, Active Ankle). Ground reaction forces along the mediolateral axis and EMG activity of the peroneus longus, tibialis anterior, and medial gastrocnemius were simultaneously recorded during force plate contact.
Ankle bracing did not affect peak impact force (P > 0.05), maximum loading force (P > 0.05), or peak propulsion force (P > 0.05) in the lateral direction compared with the control condition. Ankle bracing reduced the EMG activity of the peroneus longus during peak impact force compared with the control condition (P < 0.05), although no differences were noted between the two braces. Furthermore, peroneous longus activity during maximum loading force and peak propulsion remained unaffected (P < 0.05). Ankle bracing did not affect the EMG activity of the tibialis anterior and medial gastrocnemius at the point of peak impact force, maximum loading force (P > 0.05), and peak propulsion force (P > 0.05).
These data suggest that ankle bracing may not affect the forces experienced at the foot and ankle, but helps reduce the strain placed on the peroneus longus during peak impact force. Furthermore, ankle bracing does not alter the function of the tibialis anterior and medial gastrocnemius during dynamic inversion stress.
本研究旨在评估在动态内翻应力期间，外侧踝关节支撑对地面反作用力以及所选下肢肌肉肌电活动的影响。
24名健康男性在三种踝关节支撑条件下（无支撑——对照、Aircast运动型马镫式护具、主动踝关节护具），以其最大速度的80%-90%的速率进行五次外侧动态运动试验。在测力台接触期间，同时记录沿内外侧轴的地面反作用力以及腓骨长肌、胫骨前肌和腓肠肌内侧头的肌电活动。
与对照条件相比，踝关节支撑在外侧方向上不影响峰值冲击力（P>0.05）、最大负荷力（P>0.05）或峰值推进力（P>0.05）。与对照条件相比，踝关节支撑在峰值冲击力期间降低了腓骨长肌的肌电活动（P<0.05），尽管两种护具之间未发现差异。此外，在最大负荷力和峰值推进力期间，腓骨长肌的活动未受影响（P<0.05）。在峰值冲击力、最大负荷力（P>0.05）和峰值推进力（P>0.05）时，踝关节支撑不影响胫骨前肌和腓肠肌内侧头的肌电活动。
这些数据表明，踝关节支撑可能不会影响足踝部所承受的力，但有助于减轻峰值冲击力期间腓骨长肌所承受的应变。此外，在动态内翻应力期间，踝关节支撑不会改变胫骨前肌和腓肠肌内侧头的功能。
