Abstract
In the experiment, the author used wave plus wireless surface electromyography system (SEMs + 3-axis acceleration sensor) made in Italy and wave wireless EMG software system, high-definition high-speed camera and human joint angle measuring instrument. Taking human biceps brachii as an example, the static and dynamic isometric contraction of biceps brachii was completed surface electromyography. In the experiment, the surface electromyography of biceps brachii was measured at 30°, 60°, 90°, 120°, 150°, 180° and the surface electromyography of biceps brachii was measured at the same time when the biceps brachii was not loaded or when the biceps brachii was loaded. Secondly, the surface electromyography of biceps brachii was measured at the same time when the biceps brachii completed the whole process of flexion and extension of the elbow (centripetal and centrifugal). Finally, the paper combined with HD The effect of joint angle on the contraction of biceps brachii muscle was analyzed by camera technique. The results show that the static contraction force of biceps brachii is different when the elbow joint is at different angles; in addition, when the dynamic contraction, the contraction force of biceps brachii is inversely proportional to the angle of elbow joint.
Highlights
Skeletal muscle is composed of muscle abdomen and tendon
"Joint angle effect" refers to that in the process of human joint movement caused by skeletal muscle contraction, because human skeletal muscle is mostly single joint or multi joint muscle, the starting and ending points of skeletal muscle are generally located on different bones [1]
When skeletal muscle contracts and pulls skeletal movement, the bone levers formed by different bones and joints will form a certain angle when the joint is not At the same angle, due to the influence of external resistance and the joint influence of bone lever, the mechanical characteristics and values of active muscle to overcome resistance contraction will change with the change of bone lever angle
Summary
Skeletal muscle is composed of muscle abdomen and tendon. The beginning and end of tendon are connected with bone across joint. "Joint angle effect" refers to that in the process of human joint movement caused by skeletal muscle contraction, because human skeletal muscle is mostly single joint or multi joint muscle, the starting and ending points of skeletal muscle are generally located on different bones [1]. The study of human body movement is inseparable from the evaluation of muscle strength It is of great theoretical and practical significance to study the measurement of joint angle effect and muscle strength. Based on mathematical analysis and experiment, this paper takes the measurement of human joint angle effect and muscle strength as the research object, aiming to provide basis for strength training in sports, mastering and improving sports technology, scientific fitness of mass sports, prevention of sports injury and sports teaching and research [4]
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