Purpose To compare anthropometric and physical performance profiles of Japanese 11th and 12th grade American football players within each positional group.Methods Fifty-two 11th and 12th grade American football player...Purpose To compare anthropometric and physical performance profiles of Japanese 11th and 12th grade American football players within each positional group.Methods Fifty-two 11th and 12th grade American football players from two Japanese high schools participated in the study during the summer pre-season period.They performed anthropometric(height and body mass)and physical(vertical jump,broad jump,40-yard dash,pro-agility shuttle 4-kg medicine ball chest throw,front throw,and back throw)testing.Vertical jump momentum and 10-yard sprint momentum were also calculated by multiplying the velocity and body mass.Athletes were divided into two groups by playing positions:skill players and linemen.Results Skill players in the 12th grade were better at medicine ball chest throw(d=0.73,P=0.04)and vertical jump momen-tum(d=0.75,P=0.03)than those in the 11th grade.However,there were no differences in any measurements(P>0.05)between linemen from the two grades.Conclusion The current study suggests that upper and lower body absolute power and momentum production can be improved for skill players even over 17 years old.On the other hand,body size and speed,attributes that did not change between 11th and 12th grades,seem to be essential talent identification criteria in the current environment.Further study is needed to monitor longitudinal performance improvements in implementing talent development programs by focusing on the quality of speed,agility and power development at the youth level.展开更多
The world's greatest professional football players are able to execute effective tactical decisions as well as fulfil various physical demands.However,the degree to which both are associated with greater potential...The world's greatest professional football players are able to execute effective tactical decisions as well as fulfil various physical demands.However,the degree to which both are associated with greater potential in a football academy is unknown.Therefore,the aim of this study was to investigate decision-making skill and physical performance as contributing factors to coach potential rankings in an English football academy.Ninety-eight outfield academy players(Foundation Development Phase[FDP]under-9 to under-11 n=40;Youth Development Phase[YDP]under-12 to under-16 n=58)participated in the study.They engaged in 45 film-based simulations at two occlusion phases(e.g.,the visual display is cut-off at a precise time during an action),firstly"during"and secondly"post"execution,to examine decision-making skill.Participants also completed four fitness tests to examine physical performance.A classification of"higher-potentials"(top third)and"lower-potentials"(bottom third)were applied through coach rankings.Independent t-tests compared the decision-making and physical performance tests.Higher-potentials made significantly more accurate decisions within the"post"phase within the FDP(P<0.05)and the"during"phase within the YDP(P<0.05).Additionally,higher-potentials were significantly faster for the 0-30 m sprint in both the FDP and YDP(P<0.05),with higher-potentials within the YDP also significantly faster in the 0-10 m sprint(P<0.05)and jumped significantly higher in the countermovement jump(P<0.05).These findings indicated that greater football potential may be associated with superior perceptual-cognitive expertise and quicker sprint ability in both academy age phases,with a greater discriminatory function within the older cohort.展开更多
基金funded by JSPS KAKENHI,Grant Number 16K16557 and JSC High Performance Center Total Conditioning Research Project.
文摘Purpose To compare anthropometric and physical performance profiles of Japanese 11th and 12th grade American football players within each positional group.Methods Fifty-two 11th and 12th grade American football players from two Japanese high schools participated in the study during the summer pre-season period.They performed anthropometric(height and body mass)and physical(vertical jump,broad jump,40-yard dash,pro-agility shuttle 4-kg medicine ball chest throw,front throw,and back throw)testing.Vertical jump momentum and 10-yard sprint momentum were also calculated by multiplying the velocity and body mass.Athletes were divided into two groups by playing positions:skill players and linemen.Results Skill players in the 12th grade were better at medicine ball chest throw(d=0.73,P=0.04)and vertical jump momen-tum(d=0.75,P=0.03)than those in the 11th grade.However,there were no differences in any measurements(P>0.05)between linemen from the two grades.Conclusion The current study suggests that upper and lower body absolute power and momentum production can be improved for skill players even over 17 years old.On the other hand,body size and speed,attributes that did not change between 11th and 12th grades,seem to be essential talent identification criteria in the current environment.Further study is needed to monitor longitudinal performance improvements in implementing talent development programs by focusing on the quality of speed,agility and power development at the youth level.
基金funded by the University of Exeter,College of Life&Environmental Sciences,the Open Innovation Platform at the University of Exeter,and Exeter City Football Club Academy.
文摘The world's greatest professional football players are able to execute effective tactical decisions as well as fulfil various physical demands.However,the degree to which both are associated with greater potential in a football academy is unknown.Therefore,the aim of this study was to investigate decision-making skill and physical performance as contributing factors to coach potential rankings in an English football academy.Ninety-eight outfield academy players(Foundation Development Phase[FDP]under-9 to under-11 n=40;Youth Development Phase[YDP]under-12 to under-16 n=58)participated in the study.They engaged in 45 film-based simulations at two occlusion phases(e.g.,the visual display is cut-off at a precise time during an action),firstly"during"and secondly"post"execution,to examine decision-making skill.Participants also completed four fitness tests to examine physical performance.A classification of"higher-potentials"(top third)and"lower-potentials"(bottom third)were applied through coach rankings.Independent t-tests compared the decision-making and physical performance tests.Higher-potentials made significantly more accurate decisions within the"post"phase within the FDP(P<0.05)and the"during"phase within the YDP(P<0.05).Additionally,higher-potentials were significantly faster for the 0-30 m sprint in both the FDP and YDP(P<0.05),with higher-potentials within the YDP also significantly faster in the 0-10 m sprint(P<0.05)and jumped significantly higher in the countermovement jump(P<0.05).These findings indicated that greater football potential may be associated with superior perceptual-cognitive expertise and quicker sprint ability in both academy age phases,with a greater discriminatory function within the older cohort.
