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October 19, 2015
Vertical Jump GRFs are related to NCAA D1 Men’s Basketball Game Performances
jumpshot
photo: SD Dirk on Flickr

Athleticism is about movement quality; creating a neuromuscular solution to solve a problem in your own unique way. Such an art form cannot be captured by simple correlations of one variable to another—jump higher and you will play better at your sport.   What if we could measure the quality of movement instead of just the outcome?  Even better, what if we started looking at sports metrics (Minutes Played, Rebounds, Strike Percentage) as the ultimate goal, rather than focusing on training outcomes?

cal4Canonical correlation is an analysis used to identify and measure the associations among two sets of variables where are there are multiple inter-correlated outcomes. Specifically at Sparta (and with our partners), it allows the evaluation of the Sparta signature™ SHAPE, not just the quantitative outcome of producing more force and subsequently higher t scores. The goal is movement quality, which is different for everyone based on their sport, position, injury history, etc. Canonical correlation evaluates the shape of the Sparta signature by identifying how multiple t score changes affect the intended outcome on the field or court.

An example of a published abstract on such canonical correlation is below, showing that more minutes played in basketball (a positive outcome) and a higher Sparta signature EXPLODE t score (MVCF,  relative mean vertical concentric force ) and lower LOAD t score (ERVF, eccentric rate of force development). Basically when the shape of the signature changed to resemble more of a “raised middle finger” (figure right), then better basketball players were the result.

VERTICAL JUMP GROUND REACTION FORCES ARE RELATED TO NCAA D1 MEN’S BASKETBALL GAME PERFORMANCES – A PILOT STUDY A.C. Fry, A. Hudy, G. Cain, P. Wagner, K.J. Williams. Research and Coaching Performance Team, University of Kansas; Sparta Sport Performance, Menlo Park, CA; Dept. of Statistics, Brigham Young University.

The development of force plate software for rapidly evaluating vertical jump (VJ) ground reaction forces (GRF) permits easy monitoring of off-court measures of high velocity and power. Whether these measures are related to actual game performances is not known. PURPOSE: The purpose of this project was to determine if kinetic measures from VJ tests are related to actual game performances for a high level men’s college basketball team. METHODS: Players (N=16, BW=95.6±13.7 kg; X±SD) from an NCAA D1 men’s basketball team were monitored during the 2014-15 competition season. Prior to games, players performed a standardized counter-movement VJ test protocol with arm swing while on a 3-D force plate (Kistler Instrumente AG, Switzerland). Resulting GRF data were analyzed using proprietary software (Sparta Sport Performance, Menlo Park, CA). Kinetic variables measured during the VJ included relative mean vertical concentric force (MVCF), eccentric rate of vertical force development (ERVF), relative concentric vertical impulse (CVI), and center of mass VJ height (COM VJ). Game variables included minutes played (MIN), free throws attempted (FTA), offensive rebounds (OFFR), defensive rebounds (DEFR), blocks (BLK), and steals (STL) for each game. A total of 87 tests were performed as players were tested multiple times throughout the season and mean scores for all variables were calculated. RESULTS: The following performances were observed for all test sessions; MVCF = 23.5±2.9 N×kg-1, ERVC = 7456±3487 N×s-1, CVI = 5.83±0.37 [N×s]×kg-1, COM VJ = 0.57±0.07 m, MIN = 17.8±11.3 min, FTA = 2.5±2.8, OFFR = 1.0±1.1, DEFR = 2.1±2.0, BLK = 0.5±0.8, and STL = 0.5±0.6. A canonical correlation was performed to determine relationships between all force plate variables combined and all game variables combined (r=0.634; eigenvalue = 0.4022; p<0.001). Standardized loadings ≥ ±0.3 indicated three force plate variables (AVCF = -1.680, ERVF = 1.061, COM VJ = 0.391), and two game variables (MIN = -1.058, OFFR = 0.725) contributed significantly to the canonical correlation. CONCLUSIONS: Basketball game performance measures are related to combinations of vertical jump kinetics. It may be possible to partially account for game performances using a standardized VJ kinetics test, and to monitor training and game performances across a training year.

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October 19, 2015
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7 thoughts on “Vertical Jump GRFs are related to NCAA D1 Men’s Basketball Game Performances”

  1. Great article, but i only have a question what is your t score?i can understand that is a standardised metric but how you calculate it?

    1. Hi Christos,
      A T-score is similar to a Z-score. Essentially it is a reference of how the current score compares to what we expect for the average of elite and professional athletes. The higher the T-score the better an athlete compares to the population group. We present T-score because in the context of our assessment it is more meaningful, actionable and easier to interpret compared to raw values.

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