Effects of differences in ankle joint stabilization on lower limb muscle synergy patterns during impact change of direction maneuvers
10.3969/j.issn.1001-1242.2025.08.006
- VernacularTitle:踝关节稳定程度差异对冲击性变向动作中下肢肌肉协同模式的影响
- Author:
Li KONG
1
;
Haojie LI
1
;
Xie WU
1
Author Information
1. 上海体育大学运动健康学院,上海市,200438
- Publication Type:Journal Article
- Keywords:
functional ankle instability;
neuromuscular control strategies;
muscle synergies;
non-negative ma-trix decomposition
- From:
Chinese Journal of Rehabilitation Medicine
2025;40(8):1169-1181
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To analyze the lower limb muscle synergy patterns during the jump landing/cutting in patients with functional ankle instability(FAI),those who have experienced an ankle sprain without instability(Coper),and healthy controls(CON).Method:Twelve populations were recruited for each of the FAI,Coper,and CON groups(male/female ratio and whether the injured side was the favorable side were matched among groups).Kinematic,kinetic and sur-face electromyography(sEMG)data were collected from the unilateral lower limb during the jumping landing/cutting maneuver.Muscle synergy analysis was conducted using a non-negative matrix decomposition algorithm to extract parameters including the number of synergies,variance accounted for(VAF),synergy vectors,and activation coefficients.Result:Four synergy patterns existed in all three groups.Synergy l mainly activated the hip and knee exten-sors,contributing to impact absorption during landing.Synergy 2 mainly activated the knee extensors and ankle plantarflexors,functioning during both landing absorption and force generation in the lateral cut.Synergy 3 mainly activated the knee flexors and ankle plantarflexors,playing a role in the lateral cut force phase.Syner-gy 4 mainly activated the tibialis anterior muscle,contributing during the early landing phase and at the end of the lateral cut force generation phase,with a primary role in ankle stabilization.There was no significant difference in the number of synergies among the three groups,but the VAF-l(the VAF value when the num-ber of synergy is 1)of FAI group was significantly higher than the other two groups(P＜0.05).In the synergy vectors,the FAI and Coper groups showed increased activation weights for the periprosthetic muscles,reduced activation weights for the ankle plantarflexors and extensor digitorum brevis,and greater activation weights for the tibialis anterior muscles(P＜0.05).In terms of activation coefficients,the Coper group exhibited an earlier peak activation of synergy 2 and synergy 3(P＜0.05).Conclusion:Differences in ankle stabilization did not affect the number of muscle synergies in the lower ex-tremity,but muscle contributions within each synergy were altered in patients with FAI,indicating a compensa-tory strategy that relied more on proximal muscle while reducing the functional contributions of foot muscles to impact absorption and force generation.In the Coper group,reduced ankle muscle activation was compen-sated for by central adjustment of activation coefficient.
