Comparisons of Countermovement Jump Force-Time Characteristics Among National Collegiate Athletic Association Division I American Football Athletes

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Justin J. Merrigan ◽  
Lauren E. Rentz ◽  
William Guy Hornsby ◽  
John P. Wagle ◽  
Jason D. Stone ◽  
...  
Keyword(s):  
National Collegiate Athletic Association ◽  
American Football ◽  
Division I ◽  
Countermovement Jump ◽  
Force Time

scholarly journals Force-Time Waveform Shape Reveals Countermovement Jump Strategies of Collegiate Athletes

Sports ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 159
Author(s):  
Trent M. Guess ◽  
Aaron D. Gray ◽  
Brad W. Willis ◽  
Matthew M. Guess ◽  
Seth L. Sherman ◽  
...  
Keyword(s):  
Ground Reaction Force ◽  
National Collegiate Athletic Association ◽  
Reaction Force ◽  
Collegiate Athletes ◽  
Principal Component ◽  
Countermovement Jump ◽  
Vertical Ground Reaction Force ◽  
Vertical Ground ◽  
Force Time ◽  
Time Waveform

The purpose of this study was to relate the shape of countermovement jump (CMJ) vertical ground reaction force waveforms to discrete parameters and determine if waveform shape could enhance CMJ analysis. Vertical ground reaction forces during CMJs were collected for 394 male and female collegiate athletes competing at the National Collegiate Athletic Association (NCAA) Division 1 and National Association of Intercollegiate Athletics (NAIA) levels. Jump parameters were calculated for each athlete and principal component analysis (PCA) was performed on normalized force-time waveforms consisting of the eccentric braking and concentric phases. A K-means clustering of PCA scores placed athletes into three groups based on their waveform shape. The overall average waveforms of all athletes in each cluster produced three distinct vertical ground reaction force waveform patterns. There were significant differences across clusters for all calculated jump parameters. Athletes with a rounded single hump shape jumped highest and quickest. Athletes with a plateau at the transition between the eccentric braking and concentric phase (amortization) followed by a peak in force near the end of the concentric phase had the lowest jump height and slowest jump time. Analysis of force-time waveform shape can identify differences in CMJ strategies in collegiate athletes.

scholarly journals Identifying Reliable and Relatable Force–Time Metrics in Athletes—Considerations for the Isometric Mid-Thigh Pull and Countermovement Jump

Sports ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 4
Author(s):  
Justin J. Merrigan ◽  
Jason D. Stone ◽  
W. Guy Hornsby ◽  
Joshua A. Hagen
Keyword(s):  
Intraclass Correlation ◽  
Correlation Coefficients ◽  
Division I ◽  
Countermovement Jump ◽  
Mean Power ◽  
Time To Peak ◽  
Intraclass Correlation Coefficients ◽  
Limb Stiffness ◽  
Coefficients Of Variation ◽  
Force Time

The purpose of this study was to evaluate intrasession reliability of countermovement jump (CMJ) and isometric mid-thigh pull (IMTP) force–time characteristics, as well as relationships between CMJ and IMTP metrics. Division I sport and club athletes (n = 112) completed two maximal effort CMJ and IMTP trials, in that order, on force plates. Relative and absolute reliability were assessed using intraclass correlation coefficients (ICCs) > 0.80 and coefficients of variation (CVs) < 10%. Intrasession reliability was acceptable for the majority of the CMJ force–time metrics except for concentric rate of force development (RFD), eccentric impulse and RFD, and lower limb stiffness. The IMTP’s time to peak force, instantaneous force at 150 ms, instantaneous net force, and RFD measures were not reliable. Statistically significant weak to moderate relationships (r = 0.20–0.46) existed between allometrically scaled CMJ and IMTP metrics, with the exception of CMJ eccentric mean power not being related with IMTP performances. A majority of CMJ and IMTP metrics met acceptable reliability standards, except RFD measures which should be used with caution. Provided CMJs and IMTPs are indicative of distinct physical fitness capabilities, it is suggested to monitor athlete performance in both tests via changes in those variables that demonstrate the greatest degree of reliability.

scholarly journals Video Analysis of Concussion Exposures in a National Collegiate Athletic Association Division I Football Team

2020 ◽  
Vol 8 (2) ◽  
pp. 232596712090329
Author(s):  
Ashley V. Austin ◽  
Phillip Sasser ◽  
Kawai Tanabe ◽  
John M. MacKnight ◽  
Jeremy B. Kent
Keyword(s):  
Video Analysis ◽  
National Collegiate Athletic Association ◽  
Probability Model ◽  
American Football ◽  
Division I ◽  
Football Team ◽  
Collision Partner ◽  
Division I Football ◽  
Game Position ◽  
Field Location

Background: Research into improving player safety of sport-related concussion (SRC) in American football has been an ongoing endeavor. In an attempt to better understand the incidence of SRCs in American football, research has focused on the characteristics of SRC during gameplay. Determining SRC specifics and assessing them quantitatively can help identify high-risk scenarios and predict exposure risk. Purpose: To identify and assess the incidence of SRCs in a National Collegiate Athletic Association football team by comparing field location, player positions, collision partners, and player cues. Study Design: Descriptive epidemiology study. Methods: We used physician sideline reports of diagnosed concussions from a Division I football team from September 2010 to December 2018. Game videos were analyzed to identify the field location where the SRC occurred, collision partner, and player behavior postconcussion. The incidence of in-game SRCs by position was also assessed. We used the “words of estimative probability” model to categorize each concussion as certain, almost certain, probable, or even on the basis of our confidence in identifying them using game film. Results: This study examined 44 SRCs that occurred over 9 seasons. The SRC incidence was significantly higher in the middle defense (5-20 yards from the line of scrimmage) compared with all other field locations (relative risk, 2.46; 95% CI, 1.14-5.29; P < .05). In-game collision partners were most commonly defensive backs. The most common player cue was a hand to helmet/face mask. The positions with the highest SRC incidence by athlete-exposure, game position, and position play belonged to the defensive backs, wide receivers, and running backs. Conclusion: The middle defense had a significantly higher incidence of SRCs than all other field locations. We pose a new method to categorize concussions during video analysis by using words of estimative probability. Knowledge of SRC gameplay characteristics can potentially guide the medical staff and medical observer to better identify them.

Changes in Creatine Kinase and Cortisol in National Collegiate Athletic Association Division I American Football Players During a Season

2013 ◽  
Vol 27 (2) ◽  
pp. 434-441 ◽  
Author(s):  
William J. Kraemer ◽  
David P. Looney ◽  
Gerard J. Martin ◽  
Nicholas A. Ratamess ◽  
Jakob L. Vingren ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
National Collegiate Athletic Association ◽  
American Football ◽  
Division I ◽  
Football Players

scholarly journals Changes in Maximal Strength and Home Run Performance in NCAA Division I Baseball Players Across 3 Competitive Seasons: A Descriptive Study

2021 ◽  
Vol 6 (1) ◽  
pp. 4
Author(s):  
W. Guy Hornsby ◽  
Abigail L. Tice ◽  
Jason D. Stone ◽  
Justin J. Merrigan ◽  
Joshua Hagen ◽  
...  
Keyword(s):  
Ncaa Division I ◽  
Repeated Measures ◽  
National Collegiate Athletic Association ◽  
Descriptive Study ◽  
Peak Force ◽  
Division I ◽  
Maximal Strength ◽  
Baseball Players ◽  
Repeated Measures Analysis ◽  
Division 1

The purpose of this longitudinal, descriptive study was to observe changes in maximal strength measured via isometric clean grip mid-thigh pull and home runs (total and home runs per game) across three years of training and three competitive seasons for four National Collegiate Athletic Association (NCAA) Division 1 baseball players. A one-way repeated measures analysis of variance (ANOVA) was performed, revealing significant univariate effects of time for peak force (PF) (p = 0.003) and peak force allometrically scaled (PFa) (p = 0.002). Increases in PF were noted from season 1 to season 2 (p = 0.031) and season 3 (p = 0.004), but season 2 was not significantly different than season 3 (p = 0.232). Additionally, increases in PFa were noted from season 1 to season 2 (p = 0.010) and season 3 (p < 0.001), but season 2 was not significantly different than season 3 (p = 0.052). Home runs per game rose from the 2009 (0.32) to 2010 season (1.35) and dropped during the 2011 season (1.07). A unique aspect of the study involves 2010 being the season in which ball-bat coefficient of restitution (BBCOR) bats were introduced to the NCAA competition.

A new approach to bracket prediction in the NCAA Men’s Basketball Tournament based on a dual-proportion likelihood

2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Ajay Andrew Gupta
Keyword(s):  
National Collegiate Athletic Association ◽  
Expert Knowledge ◽  
Probability Model ◽  
Expected Value ◽  
Division I ◽  
Prediction System ◽  
New Approach ◽  
Men's Basketball ◽  
Popular Interest ◽  
The One

AbstractThe widespread proliferation of and interest in bracket pools that accompany the National Collegiate Athletic Association Division I Men’s Basketball Tournament have created a need to produce a set of predicted winners for each tournament game by people without expert knowledge of college basketball. Previous research has addressed bracket prediction to some degree, but not nearly on the level of the popular interest in the topic. This paper reviews relevant previous research, and then introduces a rating system for teams using game data from that season prior to the tournament. The ratings from this system are used within a novel, four-predictor probability model to produce sets of bracket predictions for each tournament from 2009 to 2014. This dual-proportion probability model is built around the constraint of two teams with a combined 100% probability of winning a given game. This paper also performs Monte Carlo simulation to investigate whether modifications are necessary from an expected value-based prediction system such as the one introduced in the paper, in order to have the maximum bracket score within a defined group. The findings are that selecting one high-probability “upset” team for one to three late rounds games is likely to outperform other strategies, including one with no modifications to the expected value, as long as the upset choice overlaps a large minority of competing brackets while leaving the bracket some distinguishing characteristics in late rounds.

scholarly journals Effect of Achilles Tendon Repair on Performance Outcomes After Return to Play in National Collegiate Athletic Association Division I Basketball Athletes

2021 ◽  
Vol 9 (6) ◽  
pp. 232596712110152
Author(s):  
Rafael Sanchez ◽  
Blake H. Hodgens ◽  
Joseph S. Geller ◽  
Samuel Huntley ◽  
Jonathan Kaplan ◽  
...  
Keyword(s):  
Ncaa Division I ◽  
National Collegiate Athletic Association ◽  
Performance Metrics ◽  
Female Athletes ◽  
Surgical Repair ◽  
National Basketball Association ◽  
Division I ◽  
Return To Play ◽  
Basketball Players ◽  
Significant Drop

Background: Achilles tendon (AT) ruptures are devastating injuries that are highly prevalent among athletes. Despite our understanding of the effect of AT rupture and in particular its relationship to basketball, no study has examined the effects of AT rupture and repair on performance metrics in collegiate basketball players. Purpose: To evaluate the effect of AT rupture and subsequent surgical repair on performance metrics in National Collegiate Athletic Association (NCAA) Division I basketball players who return to play after injury. Study Design: Descriptive epidemiology study. Methods: NCAA Division I basketball players who sustained an AT rupture and underwent subsequent surgical repair between 2000 and 2019 were identified by systematically evaluating individual injury reports from databases comprising NCAA career statistics and individual school statistics; 65 male and 41 female players were identified. Athletes were included if they participated in at least one-half of the games of 1 collegiate season before tearing the AT and at least 1 season after operative repair. A total of 50 male and 30 female athletes were included. Each injured athlete was matched to a healthy control by conference, position, starter status at time of injury, class year, and number of games played. Matched controls were healthy players and experienced no significant injuries during their NCAA careers. Results: After AT repair, male athletes had significantly more minutes per game, points per game, and compared with before injury. Total blocks significantly decreased after injury. Female athletes scored significantly more points per game but demonstrated a significantly lower 3-point shooting percentage after return to play. Despite undergoing AT rupture and repair, 14% of male players played in the National Basketball Association, and 20% of injured female athletes played in the Women’s National Basketball Association. Conclusion: After returning to play, men demonstrated a significant drop-off in performance only in regard to total blocks. Female athletes after AT repair demonstrated a significant improvement in points per game but had a significant drop-off in 3-point shooting percentage.

scholarly journals Gaining Access to Providing Medical Care to Male Sport Teams: The Female Athletic Trainer Perspective

2017 ◽  
Vol 52 (10) ◽  
pp. 946-954
Author(s):  
Alicia Pike ◽  
Stephanie M. Mazerolle ◽  
Jessica L. Barrett
Keyword(s):  
Medical Care ◽  
Athletic Training ◽  
Ncaa Division I ◽  
National Collegiate Athletic Association ◽  
Division I ◽  
Professional Relationships ◽  
Sport Team ◽  
Sport Teams ◽  
Job Access ◽  
The University

Context:  Female athletic trainers (ATs) can face barriers to employment within the profession. Although there is evidence for an increasing percentage of women in athletic training, the portion providing medical care to male sport teams within the professional sport and collegiate settings continues to be small. Objective:  To investigate the experiences of female ATs when seeking employment with male sport teams within the Division I setting. Design:  Qualitative study. Setting:  National Collegiate Athletic Association (NCAA) Division I. Patients or Other Participants:  A total of 15 NCAA Division I female ATs providing medical care to a male sport team participated in our study. Their mean age was 33 ± 9 years, and they had a mean of 11 ± 9 years of overall clinical experience. Data Collection and Analysis:  All participants completed one-on-one phone interviews, which were recorded and transcribed. Analysis of the data followed thematic analysis using a phenomenologic approach. Credibility was established through credibility checks, peer review, and researcher triangulation. Results:  Factors that played a role in women gaining employment with male sport teams were (1) preexisting professional relationships, (2) prior experience with a male sport, and (3) perseverance. Participants in our study were most attracted to their current positions because of (1) the environment of the collegiate setting and (2) the location of the university. Conclusions:  Job access for female ATs in this study was not viewed as a challenge. Familiarity through previous connections with the university and staff and commitment to career goals helped these women obtain the positions they held. The desire to work in male sports was not a primary contributing factor to the decision-making process. Progress continues for women in athletic training, as evidenced by the reported ease of job access with male sport teams.

Pathos and Orchestration in Elite Sport: The Experiences of NCAA DI Student-Athletes

2017 ◽  
Vol 31 (4) ◽  
pp. 344-355 ◽  
Author(s):  
Johannes Raabe ◽  
Tucker Readdy ◽  
Rebecca A. Zakrajsek
Keyword(s):  
Student Athletes ◽  
Qualitative Data ◽  
National Collegiate Athletic Association ◽  
Elite Athletes ◽  
Division I ◽  
Elite Sport ◽  
Optimal Outcomes ◽  
Semistructured Interviews

Coaching is characterized by an inherent pathos between the goals coaches hope to accomplish and those that are realized (Jones & Wallace, 2005). Coaches can actively enhance the likelihood of optimal outcomes through orchestration, a process of incremental coping intended to create improvement in performance (Jones & Wallace, 2005). The current study explored to what extent pathos also manifests in the lives of elite athletes and whether they engage in processes consistent with orchestration. Semistructured interviews were conducted with 12 National Collegiate Athletic Association Division I student-athletes. Primarily deductive analysis of the qualitative data provided confirmation for four domains: (a) sources of ambiguity created by coaches, (b) other sources of ambiguity within student-athletes’ experiences, (c) attempted strategies for orchestrating the pathos, and (d) relationships are crucial for navigating the pathos. The findings potentially offer an approach to understanding the challenges athletes face, which allows coaches to more accurately provide assistance.

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