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--- sift:tutorials:openbiomechanics_project:analysis_of_shoulder_angular_velocity_baseball_pitching [2024/10/23 17:41] – [Analysis of Shoulder Angular Velocity between Elite Level and Average Collegiate Pitchers] wikisysop
+++ sift:tutorials:openbiomechanics_project:analysis_of_shoulder_angular_velocity_baseball_pitching [2024/10/23 17:58] (current) – Removed commentary interpreting the shape of non-significant SPM result. wikisysop
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 Shoulder angular velocity is a key metric in evaluating the effectiveness of a baseball pitch. While pitch performance is often linked to shoulder angular velocity, the complex nature of shoulder biomechanics presents challenges in standard analysis. In this study, we focus on the Z-axis (internal-external rotation) of shoulder angular velocity using a Y-X-Z Cardan sequence, particularly analyzing elite-level college pitchers and average collegiate pitchers.
-We compare the top 10 pitchers, defined by their pitch speed, to the general college pitcher population. Contrary to our initial expectations, the findings reveal that there are no significant differences between the Elite Level Pitchers and the average collegiate pitching population in terms of shoulder angular velocity. This study provides insights into the complexity of shoulder motion in elite pitchers, highlighting that factors beyond shoulder angular velocity may contribute to superior pitch performance.
+We compare the top 10 pitchers, defined by their pitch speed, to the general college pitcher population. Contrary to our initial expectations, the findings reveal that there are no significant differences between the Elite Level Pitchers and the average collegiate pitching population in terms of shoulder angular velocity as found through an SPM analysis. This study provides insights into the complexity of shoulder motion in elite pitchers, highlighting that factors beyond shoulder angular velocity may contribute to superior pitch performance.
 This investigation shows the utilization of Sift as a powerful tool that allows for efficient data processing and comparison to analyze motion capture data while evaluating the following research question:
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 ====Comparing Elite Players to Normal Database====
-With a **new blank workspace** in Sift, we are able to start the process of comparing the shoulder angular velocities of the 'Elite' group versus the average population which is saved in the normal database.
+With a **new blank workspace** in Sift, we are able to start the process of comparing the shoulder angular velocities of the 'Elite' group versus the average college pitcher population which is saved in the normal database.
 __**Load 'Elite' Players**__
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 Next, we can begin to construct our normal database queries to retrieve the queries for both the library and workspace summaries for the Z-direction. These are useful when creating the plots and deeper into the analysis when performing SPM.
-When you query the **library summary**, you’re retrieving aggregate data which represents what the “average” collegiate pitcher looks like in terms of shoulder angular velocity in the Z-direction. This data is used to compare the elite pitchers’ SAV to the baseline averages, giving insight into how the elite athletes differ from the norm.
+When you query the **library summary**, you’re retrieving aggregate data which represents what the “average” college pitcher looks like in terms of shoulder angular velocity in the Z-direction. This data is used to compare the elite pitchers’ SAV to the baseline averages, giving insight into how the elite athletes differ from the norm.
-Workspace summary queries allow you to make more granular comparisons. Instead of looking at overall population means, you can compare individual trials for average collegiate pitchers to those of elite pitchers. This can help in assessing consistency in performance and how much variation exists between trials for elite pitchers versus the average population.
+Workspace summary queries allow you to make more granular comparisons. Instead of looking at overall population means, you can compare individual trials for average collegiate pitchers to those of elite pitchers. This can help in assessing consistency in performance and how much variation exists between trials for elite pitchers versus the average college pitcher population.
 Select the **ND Query Builder** button in the explore page to open the dialog box.
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 __**Library Summary Comparisons**__
-The library summary represents a mean signal derived from a large number of individuals, providing a baseline of what is considered a typical movement for the general college pitcher population. By using this as a reference, you can see how the elite pitchers deviate from or align with the general college pitcher population. By using this as a reference, you can see how the elite pitchers deviate or align with the general population.
+The library summary represents a mean signal derived from a large number of individuals, providing a baseline of what is considered a typical movement for the general college pitcher population. By using this as a reference, you can see how the elite pitchers deviate from or align with the general college pitcher population.
 On the explore page, **Hold Down CTRL** and **Left-Click** both the **Elite_ShoulderAngularVelocity_Z** query as well as the **R_SAV_Z_Lib**. Make sure __Select All Workspaces__ is checked off.
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 {{:sift:tutorials:openbiomechanics_project:spm_graph_editedalpha.jpg?800|}}
 The SPM plot analysis, using an alpha level of 0.05, reveals a critical t-statistic threshold of 2.73, indicated by the dashed red line at the top of the graph. This threshold represents the point beyond which differences in shoulder angular velocity (SAV-Z) between elite pitchers and the general collegiate population would be considered statistically significant. However, throughout the entire range of normalized motion, the observed t-statistic consistently remains below this threshold, suggesting that there are no statistically significant differences in SAV-Z between the two groups.
-Despite this, the curve's jagged shape indicates greater variability in elite pitchers' SAV-Z, especially in the early phase of motion, highlighting the complexity of elite pitching mechanics.
 ====Conclusion====