The impact of skill level on the statistical parametric mapping (SPM) of continuous relative phase (CRP) during gymnastic sub-parallel swing
Oral Presentation
Paper ID : 2118-SSRC
Authors
1دانشگاه یزد
2دانشگاه یزد دانشکده روانشناسی و علوم تربیتی بخش تربیت بدنی
Abstract
The existence of coordination in the execution of gymnastic skills is a fundamental principle, and its evaluation can help to assess the skill level of individuals. The aim of this study was to compare the coordination of the shoulder and thigh joints during the forward swing phase of the parallel swing using SPM.
The participants in this study were 24 teenage gymnasts (average age: 10.1 years, height: 140.5 cm, weight: 32.5 kg), who were divided into two groups of 12 amateurs and professionals based on their duration of activity and referees score in gymnastics. The first step involved extracting kinematic data from the joints to calculate CRP. Reflective markers were attached to anatomical landmarks on the gymnasts' bodies, and using a motion analysis system, the sagittal angular displacement of the shoulder and thigh joints was extracted as a percentage of the sub-parallel swing cycle. The next step involved calculating the angular velocity of the joints during the same period by deriving displacement. To calculate the phase angle, displacement and angular velocity were normalized within a range of -1 to +1 to form a state space. The phase angle was then obtained by calculating the slope of the graph. Finally, subtracting the phase angle of the proximal joint from that of the distal joint yielded CRP. To compare individuals based on skill level, SPM and independent t-tests were used.
The results showed a significant difference in coordination between amateur and professional groups in the range of 30 to 50% of the sub-parallel swing cycle (P= 0.001), with no significant difference observed at other percentages.
In summary, these findings suggest that focusing on improving coordination during middle percentages of parallel swing could assist coaches in effectively teaching this fundamental skill to amateur gymnasts.
The participants in this study were 24 teenage gymnasts (average age: 10.1 years, height: 140.5 cm, weight: 32.5 kg), who were divided into two groups of 12 amateurs and professionals based on their duration of activity and referees score in gymnastics. The first step involved extracting kinematic data from the joints to calculate CRP. Reflective markers were attached to anatomical landmarks on the gymnasts' bodies, and using a motion analysis system, the sagittal angular displacement of the shoulder and thigh joints was extracted as a percentage of the sub-parallel swing cycle. The next step involved calculating the angular velocity of the joints during the same period by deriving displacement. To calculate the phase angle, displacement and angular velocity were normalized within a range of -1 to +1 to form a state space. The phase angle was then obtained by calculating the slope of the graph. Finally, subtracting the phase angle of the proximal joint from that of the distal joint yielded CRP. To compare individuals based on skill level, SPM and independent t-tests were used.
The results showed a significant difference in coordination between amateur and professional groups in the range of 30 to 50% of the sub-parallel swing cycle (P= 0.001), with no significant difference observed at other percentages.
In summary, these findings suggest that focusing on improving coordination during middle percentages of parallel swing could assist coaches in effectively teaching this fundamental skill to amateur gymnasts.
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