Assessment of Sprint and Change-of-Direction Performance in College Football Players

2013 ◽  
Vol 8 (2) ◽  
pp. 211-212 ◽  
Author(s):  
Giancarlo Condello ◽  
Kevin Schultz ◽  
Antonio Tessitore
Keyword(s):  
College Football ◽  
Football Players ◽  
Change Of Direction ◽  
Football Game ◽  
The Relationship ◽  
Split Time

The aim of the current study was to investigate the relationship between straight-sprint and change-of-direction performance. Total sprinting time and split time at 5 m were collected from 44 college football players during a 15-m straight sprint (SS15m) and a 15-m zigzag sprint with two 60° changes of direction (COD15m). Differences in sprinting time between COD15m and SS15m and between COD5m and SS5m were expressed as percentage of decrement at 5 m and 15 m (Δ%5m and Δ%15m). Significant and high correlations emerged between SS15m and COD15m (r = .86, P < .0001), SS5m and SS15m (r = .92, P < .0001), SS5m and COD5m (r = .92, P < .0001), and COD5m and COD15m (r = .71, P < .0001). Δ%5m and Δ%15m showed a range of 1.2–30.0% and 34.9–59.4%, respectively. These results suggested how straight-sprint and change-of-direction performance are similar abilities in college football players, in particular when a smaller angle of the change of direction is considered. Moreover, it seems necessary to have athletes undergo tests that mimic the demands of football game, which is characterized by sprint on short distances and with changes of direction.

Relationship Between Pretraining Subjective Wellness Measures, Player Load, and Rating-of-Perceived-Exertion Training Load in American College Football

2018 ◽  
Vol 13 (1) ◽  
pp. 95-101 ◽  
Author(s):  
Andrew D. Govus ◽  
Aaron Coutts ◽  
Rob Duffield ◽  
Andrew Murray ◽  
Hugh Fullagar
Keyword(s):  
Muscle Soreness ◽  
Perceived Exertion ◽  
Training Session ◽  
College Football ◽  
Training Load ◽  
Rating Of Perceived Exertion ◽  
Football Players ◽  
Unit Increase ◽  
Relationship Of ◽  
The Relationship

Context:The relationship between pretraining subjective wellness and external and internal training load in American college football is unclear.Purpose:To examine the relationship of pretraining subjective wellness (sleep quality, muscle soreness, energy, wellness Z score) with player load and session rating of perceived exertion (s-RPE-TL) in American college football players.Methods:Subjective wellness (measured using 5-point, Likert-scale questionnaires), external load (derived from GPS and accelerometry), and s-RPE-TL were collected during 3 typical training sessions per week for the second half of an American college football season (8 wk). The relationship of pretraining subjective wellness with player load and s-RPE training load was analyzed using linear mixed models with a random intercept for athlete and a random slope for training session. Standardized mean differences (SMDs) denote the effect magnitude.Results:A 1-unit increase in wellnessZscore and energy was associated with trivial 2.3% (90% confidence interval [CI] 0.5, 4.2; SMD 0.12) and 2.6% (90% CI 0.1, 5.2; SMD 0.13) increases in player load, respectively. A 1-unit increase in muscle soreness (players felt less sore) corresponded to a trivial 4.4% (90% CI −8.4, −0.3; SMD −0.05) decrease in s-RPE training load.Conclusion:Measuring pretraining subjective wellness may provide information about players’ capacity to perform in a training session and could be a key determinant of their response to the imposed training demands American college football. Hence, monitoring subjective wellness may aid in the individualization of training prescription in American college football players.

scholarly journals The Relationship Between Isometric and Dynamic Strength in College Football Players

2008 ◽  
Vol 40 (Supplement) ◽  
pp. S390 ◽  
Author(s):  
Arnold G. Nelson ◽  
Michael R. McGuigan ◽  
Jason B. Winchester
Keyword(s):  
Dynamic Strength ◽  
College Football ◽  
Football Players ◽  
The Relationship

Revenue per Quality of College Football Recruit

2020 ◽  
Vol 21 (6) ◽  
pp. 571-592 ◽  
Author(s):  
Stephen A. Bergman ◽  
Trevon D. Logan
Keyword(s):  
Team Performance ◽  
College Football ◽  
Football Players ◽  
Compensation Scheme ◽  
Football Bowl Subdivision ◽  
Data Set ◽  
Unique Data ◽  
Ex Ante ◽  
The Relationship

There is significant debate about compensation of college athletes in revenue generating sports. In college football, the potential heterogeneity in player value has received little attention in the discussion. The relationship between player quality, team performance, and sport-specific revenue should inform any compensation scheme for college football players. In this article, we provide estimates of player monetary value in college football. This is the first study to exploit player-specific ex ante recruit ratings, team performance, and football-specific revenue and profit (revenue net of expenditures) to infer player valuations. This allows us to estimate value for players whose performance can be difficult to measure given traditional sport metrics. We use a unique data set which records individual recruits by ex ante star rating annually for every Football Bowl Subdivision (FBS) school and combine that data with data on team performance, bowl appearances by type, and football-specific revenue. Using a valuation approach which links player-specific quality to team performance and subsequently to revenue, we infer the value of recruits by their ex ante recruit rating. We estimate that five-star recruits increase annual revenue by US$650,000, four-star recruits increase revenue by roughly US$350,000, and three-star recruits increase revenue by US$150,000. Two-star recruits, however, are negatively related to revenue and profit, with two-star athletes reducing annual revenue by US$13,000. Overall, our results imply that player valuations are heterogeneous and that ex ante ratings of player quality are strongly related to school-specific football revenue and profit and may be predictive measures in a compensation scheme.

scholarly journals Relationship Between Toe Muscular Strength and the Ability to Change Direction in Athletes

2018 ◽  
Vol 64 (1) ◽  
pp. 47-55 ◽  
Author(s):  
Yasuhiro Yuasa ◽  
Toshiyuki Kurihara ◽  
Tadao Isaka
Keyword(s):  
Muscular Strength ◽  
Metatarsophalangeal Joint ◽  
American Football ◽  
Football Players ◽  
Test Results ◽  
Change Of Direction ◽  
Change Direction ◽  
Toe Flexor Strength ◽  
The Relationship ◽  
Flexor Strength

Abstract This study aimed to investigate the relationship between toe muscular strength and the ability to change direction in athletes. Seventeen collegiate American-football players participated in the study (age 19.9 ± 0.9 years, competition experience 7.3 ± 1.7 years). Two types of measurements were performed to evaluate toe muscular strength: toe flexor strength with the metatarsophalangeal joint in the planter flexed position and toe-pushing force with the metatarsophalangeal joint in the dorsiflexed position. The ability to change direction was evaluated using the pro-agility and 3-cone tests and change of direction deficits, calculated by subtracting the sprint times from the pro-agility and 3-cone times. There were significant correlations between toe-pushing force and the results of the pro-agility and 3-cone tests, but no significant correlations between toe flexor strength and the pro-agility and 3-cone tests. Neither toe-pushing force nor toe flexor strength was significantly correlated with the sprint test results. Furthermore, toe-pushing force was significantly correlated with the 3-cone test deficit, but toe flexor strength was not. The ability to change direction is more strongly affected by toe muscular strength (measured as toe-pushing force) with the metatarsophalangeal joint in the dorsiflexed angle than by toe muscular strength (measured as toe flexor strength) with the metatarsophalangeal joint in the plantar flexed angle. Our results suggest that athletes can improve their ability to change direction with toe muscular strength training with the metatarsophalangeal joint in the dorsiflexed position.

scholarly journals The relationship among repeated sprint and change of direction abilities in football players with cerebral palsy

Kinesiology ◽  
2020 ◽  
Vol 52 (2) ◽  
pp. 208-216
Author(s):  
Matías Javier Henríquez ◽  
Marco Kokaly ◽  
Felipe Herrera ◽  
Raul Reina
Keyword(s):  
Cerebral Palsy ◽  
Lactate Concentration ◽  
Football Players ◽  
Sprint Time ◽  
Change Of Direction ◽  
Repeated Sprint Ability ◽  
Repeated Sprint ◽  
Before And After ◽  
The Difference ◽  
The Relationship

This study aimed to describe and determine relationships between repeated sprint and change of direction (COD) abilities in football players with cerebral palsy according to four sport classes (FT5 to FT8). Seventeen male football players with cerebral palsy took part in this study (23.0±4.7 years, 65.9±9.5 kg, 168.8±5.9 cm). The repeated sprint ability (6×40-m sprints with a 20-second recovery) was evaluated to determine the best sprint time, mean sprint time, and percentage of sprint decrement. The difference in lactate concentration was determined using blood samples taken three minutes before and after testing. The Illinois Agility Test (IAT) was also used to assess players’ change of direction ability. The FT8 players had better performance (p&lt;.01) in the best sprint time, mean sprint time and in the IAT scores compared to the players of the sport classes FT5/6. Players of the sport class FT7 also reached higher performance in the IAT compared to the players of the sport classes FT5/6 (p&lt;.05). A significant correlation was found between the best sprint time and mean sprint time (r=.94, p&lt;.01), the best sprint time and the IAT (r=.62, p&lt;.01), and between the best sprint time and the difference in lactate concentration (r=-.51, p&lt;.05). The relationships between repeated sprint and change of direction abilities demonstrate the performance profile of para-footballers with cerebral palsy in those variables according to their sport classes, exhibiting lower performance than the values reported for regular football players.

scholarly journals The relationship between cam morphology and hip and groin symptoms and signs in young male football players

2020 ◽  
Vol 30 (7) ◽  
pp. 1221-1231 ◽  
Author(s):  
Pim Klij ◽  
Abida Z. Ginai ◽  
Marinus P. Heijboer ◽  
Jan A. N. Verhaar ◽  
Jan H. Waarsing ◽  
...  
Keyword(s):  
Young Male ◽  
Football Players ◽  
The Relationship ◽  
Cam Morphology ◽  
Symptoms And Signs

Effect of Turf Toe on Foot Contact Pressures in Professional American Football Players

2009 ◽  
Vol 30 (5) ◽  
pp. 405-409 ◽  
Author(s):  
Robert H. Brophy ◽  
Seth C. Gamradt ◽  
Scott J. Ellis ◽  
Ronnie P. Barnes ◽  
Scott A. Rodeo ◽  
...  
Keyword(s):  
Body Mass Index ◽  
National Football League ◽  
Peak Pressure ◽  
American Football ◽  
Football Players ◽  
Plantar Pressures ◽  
History Of ◽  
Turf Toe ◽  
The Relationship ◽  
Contact Pressures

Background: The relationship between turf toe and plantar foot pressures has not been extensively studied. Two hypotheses were tested in a cohort of professional American football players: first, that a history of turf toe is associated with increased peak hallucal and first metatarsophalangeal (MTP) plantar pressures; second, that decreased range of motion (ROM) of the first MTP correlates with increased peak hallucal and first MTP plantar pressures. Materials and Methods: Forty-four athletes from one National Football League (NFL) team were screened for a history of turf toe during preseason training. Dorsal passive MTP ROM and dynamic plantar pressures were measured in both feet of each player. Anatomical masking was used to assess peak pressure at the first MTP and hallux. Results: First MTP dorsiflexion was significantly lower in halluces with a history of turf toe (40.6 ± 15.1 degrees versus 48.4 ± 12.8 degrees, p = 0.04). Peak hallucal pressures were higher in athletes with turf toe (535 ± 288 kPa versus 414 ± 202 kPa, p = 0.05) even after normalizing for athlete body mass index ( p = 0.0003). Peak MTP pressure was not significantly different between the two groups tested. First MTP dorsiflexion did not correlate with peak hallucal or first MTP pressures. Conclusion: This study showed that turf toe is associated with decreased MTP motion. In addition, increased peak hallucal pressures were found. Further study is warranted to determine whether these pressures correlate with the severity of symptoms or progression of turf toe to first MTP arthritis.

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