摘要
目的通过模拟空降兵半蹲式着陆现场试验,探讨着陆过程中踝关节稳定度与踝关节周围相关肌肉负荷之间的关系,以及踝关节保护支具(PAB)对踝关节内翻和踝关节周围相关肌肉负荷的影响。方法于2021年8月,随机选取37名男性空降兵为研究对象,分别在有无穿戴PAB的情况下,以半蹲式姿势在1.5 m和2.0 m跳台进行跳伞着陆训练,对该过程中踝关节冠状面倾斜角度和踝关节周围相关肌肉最大自主收缩的百分比(MVC%)进行测量并进行相关性分析,同时分析穿戴PAB对冠状面倾斜角度和踝关节周围相关肌肉的影响作用。结果半蹲式着陆过程中,空降兵穿PAB和未穿PAB时胫骨前肌、外侧腓肠肌和腓骨长肌MVC%与踝关节冠状面倾斜角度均呈正相关(P<0.05)。相同高度下,与未穿PAB比较,穿PAB空降兵在半蹲式着陆过程中踝关节冠状面倾斜角度均降低,差异均有统计学意义(P<0.05);相同高度下着陆瞬间,与未穿PAB比较,穿PAB空降兵外侧腓肠肌MVC%降低,腓骨长肌MVC%增加,差异均有统计学意义(P<0.05);1.5 m高度下着陆瞬间后至站稳阶段(100~200 ms),与未穿PAB比较,穿PAB空降兵胫骨前肌MVC%均降低,差异均有统计学意义(P<0.05)。2.0 m高度下在站稳后阶段(200 ms),与未穿PAB比较,穿PAB空降兵胫骨前肌MVC%降低,差异有统计学意义(P<0.05)。结论穿戴PAB能降低踝关节冠状面倾斜角度,提高踝关节稳定性,减少外侧腓肠肌着陆时的肌肉负荷,并在着陆后减轻胫骨前肌肌肉负荷,但在着陆瞬间增加了腓骨长肌肌肉负荷。
ObjectiveTo investigate the relationship between ankle stability and associated muscle load around the ankle and the effect of a parachute ankle brace(PAB)on ankle inversion and associated muscle load around the ankle during landing through the simulated paratrooper semi-squat landing field experiment.MethodsIn August 2021,37 male paratroopers were randomly selected as the study objects to perform parachute landing training in the semi-squat posture on the 1.5 m and 2.0 m jump platforms with or without PAB,respectively.The coronal plane tilt angle of ankle joint and the percentage of maximum voluntary contraction(MVC%)of associated muscles around ankle joint during the process were measured and correlation analysis was conducted.And the effect of wearing PAB on the coronal plane tilt angle of ankle joint and the associated muscles around the ankle joint was analyzed.ResultsDuring the semi-squat landing,the MVC%of the tibialis anterior muscle,lateral gastrocnemius muscle and peroneus longus muscle were positively correlated with the ankle coronal plane tilt angle in paratroopers wearing and without wearing PAB,and the correlations were statistically significant(P<0.05).At the same height,compared with those without PAB,the coronal plane tilt angle of the ankle joint decreased during semi-squat landing in paratroopers PAB,and the differences were statistically significant(P<0.05).At the landing moment of the same height,compared with those without PAB,the MVC%of lateral gastrocnemius muscle decreased and the MVC%of peroneus longus muscle increased in paratroopers wearing PAB,and the differences were statistically significant(P<0.05).After the landing moment until the standing stage(100-200 ms)at 1.5 m height,the MVC%of the tibialis anterior muscle decreased in paratroopers wearing PAB compared with those without PAB,and the differences were statistically significant(P<0.05).In the post-standing stage(200 ms)at 2.0 m height,the MVC%of the tibialis anterior muscle decreased in paratroopers wearing PAB compared with those without PAB,and the difference was statistically significant(P<0.05).ConclusionWearing PAB can reduce the ankle coronal plane tilt angle,improve ankle stability,reduce the muscle load of the lateral gastrocnemius muscle at the moment of landing,and reduce the load of the tibialis anterior muscle after landing,but increase the peroneus longus muscle load at the moment of landing.
作者
王亦君
吴磊
周照博
魏怡
黄新宇
刘涛
Wang Yijun;Wu Lei;Zhou Zhaobo;Wei Yi;Huang Xinyu;Liu Tao(Department of Labor Hygiene and Environmental Hygiene,School of Public Health,School of Medicine,Wuhan University of Science and Technology,Wuhan 430065,China)
出处
《中华劳动卫生职业病杂志》
CAS
CSCD
北大核心
2024年第7期498-503,共6页
Chinese Journal of Industrial Hygiene and Occupational Diseases
基金
国防横向项目(2021H10152)。
关键词
踝关节
跳伞
落地
踝关节内翻
肌肉负荷
相关性
Ankle joint
Parachute jumping
Landing
Ankle inversion
Muscle load
Correlation
