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• W4387061799 abstract "The countermovement jump (CMJ) is commonly utilized by sport performance staff and may provide insight into neuromuscular function. However, most CMJ force plate software calculates 70+ metrics from a single CMJ, leading to clinician information overload and confusion. Many of these metrics are mathematical derivatives of each other and likely provide duplicative information. PURPOSE: Use a data-driven approach to determine how many “things” CMJs measure and classify the 70+ metrics by what they measure. METHODS: As standard of practice, the West Virginia University Football Team regularly performs CMJ testing conducted by the Strength & Conditioning Staff. Since 2021, 6,154 CMJs have been performed by 177 athletes using the Hawkin Dynamics force plate system. Hawkin Dynamics calculates 74 metrics for each CMJ. A parallel plot analysis was performed to determine how many components or “things” are being measured across the 74 metrics. Sparse principal component analysis which maximizes near-zero weight for each component, then allowed for each metric to be grouped or classified according to the component upon which they have the greatest weight. RESULTS: The parallel plot analysis indicated that 9 components should be extracted. The grouping of CMJ metrics can be seen in Tables 1 & 2. CONCLUSION: While the number of metrics derived from CMJs seem to expand each year, only 9 “things” are actually being measured. It is suggested that clinicians use the classification groupings from this analysis and select no more than one metric from each group to limit the unnecessary evaluation of duplicative information. Table 1. - Group 1 Group 2 Group 3 Group 4 Jump Height Avg. Braking Force Player Weight L/R Peak Braking Force Avg. Relative Propulsive Force L. Force at Peak Braking Force Jump Momentum L/R Avg. Braking Force Peak Relative Propulsive Force R. Force at Peak Braking Force Propulsive Net Impulse L/R Peak Propulsive Force Flight Time Peak Braking Force Positive Impulse L/R Avg. Propulsive Force Avg. Propulsive Velocity Avg. Propulsive Force Avg. Propulsive Power L/R Avg. Braking Rate of Force Development Takeoff Velocity L. Avg. Braking Force Peak Propulsive Power L/R Braking Impulse Index Peak Velocity R. Avg. Braking Force L. Avg. Propulsive Force L/R Propulsive Impulse Index Avg. Relative Propulsive Power Peak Propulsive Force R. Avg. Propulsive Force L/R Peak Landing Force Peak Relative Propulsive Power Positive Net Impulse Avg. Landing Force L/R Avg. Landing Force mRSI L. Force at Peak Propulsive Force L. Avg. Landing Force Relative Propulsive Net Impulse Force at Minimum Displacement R. Avg. Landing Force R. Force at Peak Propulsive Force Propulsive Impulse Braking Impulse Table 2. - Group 5 Group 6 Group 7 Group 8 Group 9 Stiffness Braking Phase Avg. Relative Braking Force Unweighting Phase Countermovement Depth Propulsive Phase Impulse Ratio Unweighting Phase Percentage Peak Landing Force Braking Phase Percentage Time to Takeoff Avg. Braking Velocity Braking Rate of Force Development Relative Peak Landing Force Propulsive Phase Percentage Braking Net Impulse Avg. Braking Power R. Avg. Braking Rate of Force Development L. Force at Peak Landing Force RSI Relative Braking Impulse Avg. Relative Braking Power L. Avg. Braking Rate of Force Development R. Force at Peak Landing Force Relative Braking Net Impulse Peak Braking Power Peak Relative Braking Force Relative Propulsive Impulse Peak Relative Braking Power" @default.
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• W4387061799 date "2023-09-01" @default.
• W4387061799 modified "2023-09-27" @default.
• W4387061799 title "With So Many Counter-movement Jump Metrics Available, Which Ones To Choose?" @default.
• W4387061799 doi "https://doi.org/10.1249/01.mss.0000985144.15748.f7" @default.
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