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Master of Science (MS) in Physical Education: Exercise Science
Wellness and Movement Sciences
The javelin throw is a technically-demanding sport and is excellent example of how the kinetic chain works starting with the landing of the drive foot (right foot) causing a chain reaction traveling up the knee to the hip, through the trunk, to the shoulder, the elbow, and then the wrist. The purpose of this study was to investigate the relationships between thrower experience and the timing and degree of hip-shoulder separation in the javelin throw. A six-camera, three-dimensional motion capture system was used to capture a 27 reflective marker model of the movement of the lower body (pelvis, legs, and feet) and upper body (shoulder and elbow) of 8 participants javelin throws from a short approach. There were no significant relationships between years of competitive experience and the timing and degree of hip-shoulder separation of high school and collegiate throwers was found. A high significant correlation was found between PVASIS and PVAC (r = 0.714, p = 0.047) along with age and PVAC (rs = 0.762, p = 0.028). As athletes increase in age, utilization of the right hip increases, generating a greater peak hip velocity. Energy from the drive hip transfers up through the trunk and into the throwing shoulder. Thereby increasing the PVAC (throwing shoulder) will increase release velocity, overall increasing distance of the throw. Future studies should continue to investigate throwing techniques on how they affect hip shoulder separation angle and differences in timing of peak velocity of the hip and shoulder.
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Baker, Samantha, "Hip-shoulder separation in the javelin throw and its relationship with level of experience" (2021). EWU Masters Thesis Collection. 671.