Annual Changes in the Physical Characteristics of Japanese Division I Collegiate American Football Players
Annual Changes in the Physical Characteristics of Japanese Division I Collegiate American Football Players
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DOI：
10.47206/ijsc.v3i1.131
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发表时间：
2023-01
影响因子：
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通讯作者：
Daichi Yamashita;Shinto Kinoshita;Takeshi Sakaguchi
中科院分区：
文献类型：
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作者：
Daichi Yamashita;Shinto Kinoshita;Takeshi Sakaguchi
我们的目的是研究每年的变化，在各种身体特征的日本一级（D1）美国大学生足球运动员根据他们的位置组。我们在2014年至2016年的每个季前赛中测量了来自日本D1大学的运动员的体重，并评估了三项健身房测试（卧推，后蹲和力量清洁）和三项场地测试（40码短跑，敏捷穿梭和跳远）的表现。本分析使用了连续几年完成≥ 50%（六分之三）性能测量的55名球员的数据。使用成对t检验分析两个位置组（技术球员和巡边员）的性能数据，以确定年度变化。技术运动员的身体质量从大一到大二增加（p0.8），但从大二到大三或大三到大四没有增加。技能型运动员40码冲刺时间在所有年度比较中均较短（p0.8）。巡边员的体重从大一到大二增加，从大二到大三和大三到大四保持不变。在每个位置组的大多数年度级别比较中，力量和力量输出有显着改善，但在敏捷跑和跳远方面的改善有限。这些结果表明，年度改善的身体特征发生非线性的日本D1足球运动员。他们将受益于有针对性的力量和调节计划。然而，跳跃和敏捷性能的改善可能是有限的。
We aimed to examine the annual changes in various physical characteristics of Japanese Division I (D1) Collegiate American footballers according to their positional groups. We measured body mass, and assessed performance in three gym tests (bench press, back squat, and power clean) and three field tests (40-yard dash, pro-agility shuttle, and broad jump) at each pre-season from 2014 to 2016 for players from a Japanese D1 university. Data from 55 players who completed ≥ 50% (three out of six) of the performance measurements in consecutive years were used in this analysis. Performance data across the two positional groups (skill players and linemen) were analyzed using pairwise t-tests to determine annual changes. The skill players’ body mass increased from their freshman to sophomore years (p 0.8), but not from their sophomore to junior or junior to senior years. The skill players’ 40-yard sprint time was shorter between all the annual comparisons (p 0.8). The linemen’s body mass increased from their freshman to sophomore years, and maintained from their sophomore to junior years and junior to senior years. There were significant improvements in strength and power outputs, but limited improvements in the pro-agility run and broad jump among most of the annual class comparisons for each positional group. These results indicate that annual improvements in the physical characteristics occur nonlinearly for Japanese D1 footballers. They will benefit from targeted strength and conditioning programs. However, the improvements of jumping and agility performances may be limited.