Evaluation of stretch-shortening cycle movement by the multistep drop jump test using different drop heights

• Yoshida Takuya

  Faculty of Health and Sport Sciences, University of Tsukuba

• Matsushima Kazushi

  Ashikaga city office

• Hayashi Ryohei

  Faculty of Education, Gifu University

• Zushi Amane

  Graduate School of Comprehensive Human Sciences, University of Tsukuba

• Kariyama Yasushi

  Faculty of Sport Science, Yamanashi Gakuin University

Bibliographic Information

Other Title

• 数種類の台高を用いた多段階式ドロップジャンプテストによる伸張-短縮サイクル運動の遂行能力の評価
• スウシュルイ ノ ダイ ダカ オ モチイタ タダンカイシキ ドロップジャンプテスト ニ ヨル シンチョウ-タンシュク サイクル ウンドウ ノ スイコウ ノウリョク ノ ヒョウカ

Abstract

The purpose of this study was to evaluate the multistep drop jump (DJ) test in elite jumpers according to changes in test performance, ground reaction force, and lower limb joint kinetics with changes in drop height. Male jumpers (n=10) performed a DJ from 4 drop heights (0.3, 0.6, 0.9, and 1.2 m). The DJ-index was calculated by dividing the jump height by the contact time. The rate of change of the DJ-index (a/b) was the slope/intercept of the regression line (Y = aX+ b) derived from 4 values of the DJ-index for each subject. Jump motions in the sagittal plane and ground reaction force data were recorded using a high-speed camera and force platform, respectively. The DJ-index was lower at 1.2 m than at other drop heights. The contact time increased along with the drop height. There was no significant difference in jump height between the drop heights. The amount of negative work by 3 lower extremity joints increased with increasing drop height. The jump events performance (IAAF Score) and DJ-index at each drop height only showed a significant correlation at 1.2 m. The correlation between IAAF score and a/b was significant between these variables. According to individual characteristics, increased drop heights were associated with different patterns of change in the DJ index. Therefore, subjects were grouped according to characteristics using a/b as an index. Sub.A, who had the highest jump-event performance in the study, had participated in international meetings, and had won a medal at the World Junior Championships. The DJ-index for this subject at 0.3 m was close to the mean value, but at 1.2 m was highest among all the subjects. In contrast, the DJ-index for Sub.C at 0.3 m was highest among the subjects. However, the DJ-index decreased greatly with an increase from 0.3 m to 1.2 m. Therefore, to evaluate the performance of jumpers, it is important to use a varied range of heights, including a higher drop height (approximately 1.2 m), focusing on the rate of change with increasing drop height.

Journal

• Taiikugaku kenkyu (Japan Journal of Physical Education, Health and Sport Sciences)

  Taiikugaku kenkyu (Japan Journal of Physical Education, Health and Sport Sciences) 63 (2), 673-684, 2018-12-10

  Japan Society of Physical Education, Health and Sport Sciences

Keywords

• plyometrics
• DJ-index
• jumper

Details

• CRID: 1390282763079803904
• NII Article ID: 130007535630
• NII Book ID: AN00409623
• DOI: 10.5432/jjpehss.17129
• ISSN: 18817718
• ISSN: 04846710
• NDL BIB ID: 029410939
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I029410939
• Web Site: https://www.jstage.jst.go.jp/article/jjpehss/63/2/63_17129/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed