The percentage of the semitendinosus muscle's contribution according to the electrical activity index (EMG) in achieving the 100-meter freestyle race for young people

Abstract

Reaching the highest levels is an important matter that requires knowledge of the activities that contribute to mastering the technical performance of the 100-meter freestyle event, and knowing the precise details of it and its causes will contribute greatly to the skits and significantly to the performance with economy and a better distinct indicator. Among these elements is the diversity of music activity for the practicing muscles. , As the aim of the study was to reveal the percentage of contribution of the semitendinosus muscle according to the electrical activity index of achievement in the 100-meter freestyle event for youth, the researchers used the descriptive approach to suit the nature of the research and its problem, and the research sample consisted of Maysan Governorate youth athletes in track and field events, especially in the 100-meter sprint race. meters to represent 100% of the research population, which consisted of eight runners. The researcher used two variables of the electrical activity of the semitendinosus muscle of the right and left leg during performance using a Bluetooth electrical activity measurement system (EMG). Two points were identified on which the electrodes were fixed, and the maximum electrical activity of the two muscles was studied, and the researcher reached conclusions. next :

• There is a significant correlation between the variables, in addition to the presence of a difference in the contribution rates of the electrical activity of the right leg to that of the left leg of runners during performance.
• The semitendinosus muscle's primary role was to stabilize the knee joint during performance.

• The semitendinosus muscle of the right leg (back) contributes more during the sprint than the semitendinosus muscle of the left leg (front), and it also plays a decisive role in reaching the correct position during the start from the starting cube.