Yamashita Daichi, Asakura Masaki, Ito Yoshihiko, Yamada Shinzo, Yamada Yosuke
1Department of Sports Science Japan Institute of Sports Sciences, Tokyo, Japan; 2Deers Football Club, Tokyo, Japan; 3Graduate School of Comprehensive Human Sciences, University of Tsukuba, Ibaraki, Japan; 4Japan American Football Association, Tokyo, Japan; and 5Department of Nutritional Science, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo, Japan.
J Strength Cond Res. 2017 Sep;31(9):2455-2461. doi: 10.1519/JSC.0000000000001714.
Yamashita, D, Asakura, M, Ito, Y, Yamada, S, and Yamada, Y. Physical characteristics and performance of Japanese top-level American football players. J Strength Cond Res 31(9): 2455-2461, 2017-This study aimed to compare the physical characteristics and performance between top-level nonprofessional football players in Japan and National Football League (NFL) Combine invited players and between top-level and middle-level players in Japan to determine the factors that enhance performance in international and national competitions. A total of 168 American football players (>20 years) in Japan participated in an anthropometric (height and weight) and physical (vertical jump, long jump, 40-yard dash, pro-agility shuttle, 3-cone drill, and bench press repetition test) measurement program based on the NFL Combine program to compete in the selection of candidates for the Senior World Championship. All players were categorized into 1 of the 3 position groups based on playing position: skill players, big skill players, and linemen. Japanese players were additionally categorized into selected and nonselected players for the second tryout. The NFL Combine candidates had significantly better performance than selected Japanese players on all variables except on performance related to quickness among the 3 position groups. Compared with nonselected players, selected Japanese skill players had better performance in the 40-yard dash and bench press test and big skill players had better performance in the vertical jump, broad jump, and 40-yard dash. Selected and nonselected Japanese linemen were not different in any measurements. These results showed the challenges in American football in Japan, which include not only improving physical performance of top-level players, but also increasing the number of football players with good physical performance.
山下，D、朝仓，M、伊藤，Y、山田，S和山田，Y。日本顶级美式橄榄球运动员的身体特征与表现。《力量与体能研究杂志》31(9): 2455 - 2461，2017年——本研究旨在比较日本顶级非职业橄榄球运动员与美国国家橄榄球联盟（NFL）联合试训受邀球员之间以及日本顶级和中级球员之间的身体特征与表现，以确定在国际和国内比赛中提升表现的因素。日本共有168名年龄超过20岁的美式橄榄球运动员参加了一项基于NFL联合试训项目的人体测量（身高和体重）及体能（垂直纵跳、跳远、40码冲刺、敏捷梯测试、三锥体折返跑和卧推重复测试）测量项目，以竞争世界锦标赛成年组候选资格。所有球员根据场上位置被分为3个位置组中的1组：技巧球员、大型技巧球员和前锋。日本球员还被分为第二次试训的入选和未入选球员。在3个位置组中，除了与速度相关的表现外，NFL联合试训候选球员在所有变量上的表现都明显优于入选的日本球员。与未入选球员相比，入选的日本技巧球员在40码冲刺和卧推测试中表现更好，大型技巧球员在垂直纵跳、立定跳远和40码冲刺中表现更好。入选和未入选的日本前锋在任何测量指标上都没有差异。这些结果显示了日本美式橄榄球面临的挑战，这不仅包括提高顶级球员的身体表现，还包括增加身体表现良好的橄榄球运动员数量。
