Abstract
Shoulder joint dysfunction is the leading cause of decreased athletic ability in athletes. Shoulder joint sports injuries affect the athletic performance of athletes. Improvements in the muscle endurance of the shoulder joint can reduce the incidence of shoulder joint dysfunction. Acupuncture has been an important part of Asian culture for a long time. In acupuncture, nerves are stimulated, inducing postactivation potentiation (PAP) in the body's motor units and enhancing muscle strength. In this research, 20 female participants with full flexion/extension and adduction/abduction ranges of motion in the shoulder joint during isokinetic exercises underwent stimulation of the following acupuncture points in the shoulder joint: Binao (LI14), Jianyu (LI15), Jianliao (SJ14), Naohui (SJ13), Yuzhong (KI26), Zhongfu (LU1), Yunmen (LU2), Xiabai (LU4), Chize (LU5), Tianfu (LU3), and Xiaoluo (SJ12). In the study, there were significant increases after acupuncture in the average maximum torque in flexion, extension, and adduction; the average work in flexion/extension and adduction/abduction; the average power in flexion/extension and adduction/abduction; the total work in flexion/extension and adduction/abduction; the total net sagittal-plane work (flexion + extension); and the total net frontal-plane work (adduction + abduction) (P < 0.05). The average maximum abduction torque did not increase significantly, potentially due to antagonistic forces of muscles. Therefore, acupuncture at acupoints around the shoulder joint can increase muscle excitability, thereby delaying muscle fatigue and increasing muscle endurance.
Highlights
Shoulder osteoarthritis may be caused by shoulder muscle fatigue and frequent upper limb movements
An isokinetic instrument was used to analyze the changes in parameters during flexion and extension of the shoulder joint
The average maximum flexion torque normalized to body weight and the average maximum extension torque normalized to body weight significantly increased following acupuncture (+Δ56% and +Δ75%, P < 0.001). e average normalized work in flexion and the average normalized work in extension significantly increased following acupuncture (+Δ69% and +Δ38%, P < 0.001). e average power in flexion and the average power in extension significantly increased following acupuncture (+Δ70% and +Δ39%, P < 0.001). e total work in flexion and the total work in extension significantly increased following acupuncture (+Δ70% and +Δ39%, P < 0.001). e total work increased following acupuncture (+Δ56%, P < 0.001)
Summary
Shoulder osteoarthritis may be caused by shoulder muscle fatigue and frequent upper limb movements. Shoulder pain can be caused by prolonged exercise and flexibility or muscle imbalances between internal and external rotators during upper limb movements [2]. Frequent upper limb movements lead to functional impairment of the shoulder in athletes with glenohumeral joint laxity, biceps tendinitis, or rotator cuff injury and can lead to shoulder joint impingement syndrome [8]. Previous studies have shown that people who participate in endurance training have a high level of muscle fatigue resistance [9]. Endurance training can lead human skeletal muscles to adapt to sports activities performed repeatedly over long periods of time and improve the exercise capacity of relevant limbs [10]. Erefore, frequent upper limb movements may cause muscle fatigue around the shoulder joint, improve the muscle endurance of the shoulder joint, reduce shoulder Endurance training can lead human skeletal muscles to adapt to sports activities performed repeatedly over long periods of time and improve the exercise capacity of relevant limbs [10]. erefore, frequent upper limb movements may cause muscle fatigue around the shoulder joint, improve the muscle endurance of the shoulder joint, reduce shoulder
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