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https://irlib.pccu.edu.tw/handle/987654321/23960
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| 題名: | Quadricep and hamstring activation during drop jumps with changes in drop height |
| 作者: | Peng, HT (Peng, Hsien-Te)3;Kernozek, TW (Kernozek, Thomas W.)4;Song, CY (Song, Chen-Yi)1,2 |
| 貢獻者: | Dept Phys Educ |
| 日期: | 2011-08 |
| 上傳時間: | 2012-12-13 10:14:26 (UTC+8) |
| 摘要: | Objective: Compare the muscle activation patterns of the quadricep-hamstring during drop jumps with increasing demands of drop heights.
Design: Observational.
Setting: University biomechanics laboratory.
Participants: Fifteen male and eight female college physical education students.
Main outcome measures: Electromyographic activity of the rectus femoris (RF) and biceps lemons (BF) during the landing and takeoff phase of drop jumps from 20 to 60-cm heights. The ground contact time, vertical ground reaction force (vGRF), knee flexion angle during ground contact, and jump height after takeoff were also analyzed.
Results: The activation of RF was higher in the drop jump from 60-cm than that from 20- and 30-cm (comparing 107.0 +/- 45.9 to 82.3 +/- 30.8 and 88.9 +/- 38.9 %MVIC, P <.05) during the landing phase. Activation of BF remained similar across all drop heights. Drop jump from 60-cm resulted in greater contact time during takeoff phase and peak vGRF, and resulted in greater maximum knee flexion but straighter knee at ground contact than from lower drop heights.
Conclusion: At drop height of 60-cm, the altered knee muscular activation and movement patterns may diminish the effectiveness of plyometric training and increase the potential injury risk of knee. (C) 2010 Elsevier Ltd. All rights reserved. |
| 關聯: | PHYSICAL THERAPY IN SPORT Volume: 12 Issue: 3 Pages: 127-132 |
| 顯示於類別: | [體育學系] 期刊論文
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