Dept of Kinesiology, Mississippi State University, Mississippi State, MS, USA.
J Sport Rehabil. 2011 Aug;20(3):321-32. doi: 10.1123/jsr.20.3.321.
The latency of the peroneus longus in response to an inversion perturbation is a key component in the prevention of lateral ankle sprains. In addition, the dominant ankle is sprained more frequently than the nondominant ankle, but the cause of this has not been examined.
To investigate the combination of these 2 research-supported statements, the purpose of this study was to use an inversion perturbation that replicates the mechanism of a lateral ankle sprain to determine whether there is a difference in the latency of the peroneus longus between the dominant and nondominant legs.
Repeated-measures single-group design.
University laboratory.
15 physically active healthy volunteers with no previous history of an ankle sprain or lower extremity surgery or fracture.
Outer sole with fulcrum was used to cause 25° of inversion at the subtalar joint on landing from a 27-cm step-down task. Participants performed 10 trials on both the dominant and nondominant leg.
2 latency measures of the peroneus longus of both the dominant and nondominant leg, calculated as the amount of time from the moment of touchdown of the fulcrum until muscle activity exceeded 5 and 10 SD above baseline muscle activity.
The latency of the peroneus longus of the nondominant leg was significantly shorter when using both 5 SD (F1,14= 9.34, P = .009, d = .895) and 10 SD (F1,14= 18.56, P = .001, d = .920) above baseline muscle activity.
This difference in latency may be a result of the different demands placed on the dominant and nondominant legs during activity and may predispose the dominant ankle to a greater number of ankle sprains than the nondominant ankle.
在对抗内翻干扰时，比目鱼肌的潜伏期是预防外踝扭伤的一个关键因素。此外，优势脚踝比非优势脚踝更容易扭伤，但这一现象的原因尚未得到研究。
本研究旨在通过使用可复制外踝扭伤机制的内翻干扰，调查这两个有研究支持的说法的结合，即确定在优势腿和非优势腿之间，比目鱼肌的潜伏期是否存在差异。
重复测量单组设计。
大学实验室。
15 名身体活跃的健康志愿者，无先前踝关节扭伤或下肢手术或骨折史。
在从 27 厘米高的台阶跳下时，用带有支点的外底使距下关节产生 25°的内翻。参与者在优势腿和非优势腿上各进行 10 次试验。
优势腿和非优势腿的比目鱼肌的 2 个潜伏期测量值，计算方法是从支点触地到肌肉活动超过基线肌肉活动 5 和 10 个标准差的时间。
当使用 5 个标准差（F1,14=9.34，P=.009，d=0.895）和 10 个标准差（F1,14=18.56，P=.001，d=0.920）以上的基线肌肉活动时，非优势腿的比目鱼肌潜伏期明显缩短。
这种潜伏期差异可能是活动中对优势腿和非优势腿的不同需求造成的，这可能使优势脚踝比非优势脚踝更容易扭伤。
