Karbalaeimahdi Mina, Alizadeh Mohammad Hossein, Minoonejad Hooman, Behm David G, Alizadeh Shahab
Department of Health and Sport Medicine, Faculty of Sport Sciences and Physical Education, University of Tehran, Tehran 1417935840, Iran.
School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, NL A1C 5S7, Canada.
Sports (Basel). 2022 Jul 22;10(8):111. doi: 10.3390/sports10080111.
More than 70% of people with ankle sprain experience chronic ankle instability. However, some people are well adapted to this damage (copers) and do not suffer from chronic ankle instability (CAI). This cross-sectional study involved 34 female athletes, who were classified into three groups (athletes with CAI, copers, and healthy athletes) and tested on a Biodex Balance System. Surface electromyography (EMG) and balance scores were monitored. The coper and healthy group exhibited higher medial gastrocnemius (MG) EMG activity during unstable balance conditions. The rectus abdominus (RA) in the coper group and rectus femoris (RF) in the healthy group showed greater EMG activity compared to CAI during unstable conditions. During stable conditions, the coper group showed greater RA EMG activity compared to CAI, as well as higher tibialis anterior (TA) EMG activity compared to the healthy group. Additionally, balance error scores were higher in the CAI group than those in the healthy group under unstable conditions. In conclusion, decreased EMG activity of the MG, RF, and RA in CAI athletes may contribute to impaired balance in these individuals. The increased EMG activity of the MG, TA, and RA in copers might result in more trunk and ankle stability.
超过70%的踝关节扭伤患者会出现慢性踝关节不稳。然而，有些人能很好地适应这种损伤（适应者），不会患上慢性踝关节不稳（CAI）。这项横断面研究纳入了34名女性运动员，她们被分为三组（患有CAI的运动员、适应者和健康运动员），并在Biodex平衡系统上进行测试。监测表面肌电图（EMG）和平衡分数。在不稳定平衡状态下，适应者组和健康组的腓肠肌内侧头（MG）肌电图活动较高。与CAI组相比，适应者组的腹直肌（RA）和健康组的股直肌（RF）在不稳定状态下表现出更大的肌电图活动。在稳定状态下，与CAI组相比，适应者组的RA肌电图活动更大，与健康组相比，胫前肌（TA）肌电图活动更高。此外，在不稳定状态下，CAI组的平衡误差分数高于健康组。总之，CAI运动员的MG、RF和RA肌电图活动降低可能导致这些个体的平衡受损。适应者的MG、TA和RA肌电图活动增加可能会使躯干和踝关节更加稳定。
