Type-specific step characteristics of baseball players during 30-m sprint
Taiikugaku kenkyu (Japan Journal of Physical Education Health and Sport Sciences)
野球選手におけるステップタイプに応じた 30m 走中の疾走動態の検討 1) 国立スポーツ科学センタースポーツ科学部 〒 115-0056 東京都北区西が丘 3-15-1 2) 関西大学先端科学技術推進機構 〒 564-8680 大阪府吹田市山手町 3 丁目 3 番 35 号 3) 奈良佐保短期大学 地域こども学科 〒 630-8566 奈良県奈良市鹿野園町 806 番地 4) 鹿屋体育大学硬式野球部 〒 891-2393 鹿児島県鹿屋市白水町 1 番地 5) 大島商船高等専門学校一般科目 〒 742-2193 山口県大島郡周防大島町大字小松 1091 番地 1 6) 鹿屋体育大学スポーツパフォーマンス研究センター 〒 891-2393 鹿児島県鹿屋市白水町 1 番地 連絡先 蔭山雅洋 1. Abstract: The purpose of this study of baseball players was to clarify: 1) step characteristics during the 30-m sprint with reference to step type,
... d 2) the characteristics of individuals with faster 30-m sprint times for each step type. The subjects were 62 male university baseball players (age 20.3 ± 1.0 years, body height 1.73 ± 0.05 m, body weight 69.6 ± 6.7 kg). All the subjects ran a 30-m sprint dash, and their time was measured every 10 m and 30 m. Running speed, step frequency (SF), and step length (SL) were calculated every 10 m and 30 m. Cluster analysis was used to classify the subjects according to step type, according to the ratio of SF to SL. In addition, each step type group was divided into 2 sub-groups (good and poor players) according to the mean 30-m time. The main results were as follows: 1) the baseball players were classified into 3 step type groups: SL-type (n = 20), SF-type (n = 8), and Mid-type (n = 34). There was a difference in the step characteristics between the 3 step types during the 30-m sprint. 2) In SL-and Mid-types, the SF, SL, and SL index were higher in good players than in poor players. In SL-type, the SF index was higher in good players than in poor players. These results indicate that: 1) there were differences in step characteristics among step types, and 2) among baseball players with faster 30-m sprint times, higher SL and SF were associated with the SL-and Mid-types. The characteristics were influenced by functional factors of the lower limbs, and not by morphological factors. These findings could be useful for devising training methods that would improve the sprint performance of baseball players according to their step type. Akira 6 : Type-specific step characteristics of baseball players during 30-m sprint. Japan J. Phys. Educ. Hlth. Sport Sci.