Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump
Drop jump (DJ) is often used as a plyometric exercise to improve jumping performance. Training from improper drop heights and for improper durations lead to unfavorable biomechanical changes in the lower extremities when landing, which result in reduced training effects and even lower extremity inju...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Applied Bionics and Biomechanics |
| Online Access: | http://dx.doi.org/10.1155/2021/5551199 |
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| author | I-Lin Wang Yi-Ming Chen Ke-Ke Zhang Yu-Ge Li Yu Su Chou Wu Chun-Sheng Ho |
| author_facet | I-Lin Wang Yi-Ming Chen Ke-Ke Zhang Yu-Ge Li Yu Su Chou Wu Chun-Sheng Ho |
| author_sort | I-Lin Wang |
| collection | DOAJ |
| description | Drop jump (DJ) is often used as a plyometric exercise to improve jumping performance. Training from improper drop heights and for improper durations lead to unfavorable biomechanical changes in the lower extremities when landing, which result in reduced training effects and even lower extremity injuries. Purpose. To study the effects of repeated DJ training at drop heights of 30 cm, 40 cm, and 50 cm (drop jump height (DJH) 30, DJH40, and DJH50) on lower extremity kinematics and kinetics. The 1st, 50th, 100th, 150th, and 200th DJs (DJ1, DJs50, DJs100, DJs150, and DJs200) were recorded by using a BTS motion capture system and force platform. The MATLAB software was used to compare the kinematic and stiffness data of DJ1, DJs50, DJs100, DJs150, and DJs200 with one-way ANOVA repeated measure. If there were significant differences, the LSD method was used for post hoc comparisons. Methods. Twenty healthy male Division III athlete volunteers were selected as subjects, and 200 drop jumps (DJs200) were performed from DJH30, DJH40, and DJH50. Results. The jumping height (JH), contact time (CT), and GRF increased with drop height, and the stiffness of the legs and ankle at DJH30 was higher than that at DJH40 and DJH50 (p<0.05). Conclusion. Within DJs200, training at DJH50 yield the high impact easily leads to lower extremity injury; training at DJH30 can increase the stiffnesses of the legs and ankle joints, thus effectively utilizing the SSC benefits to store and release elastic energy, reducing the risk of lower extremity musculoskeletal injury. Therefore, coaches can choose different drop heights and training quantities for each person to better prevent lower extremity injury. |
| format | Article |
| id | doaj-art-33d5f6f45d9b4dfcbb9ee865f14ef816 |
| institution | Kabale University |
| issn | 1176-2322 1754-2103 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Applied Bionics and Biomechanics |
| spelling | doaj-art-33d5f6f45d9b4dfcbb9ee865f14ef8162025-02-03T05:51:12ZengWileyApplied Bionics and Biomechanics1176-23221754-21032021-01-01202110.1155/2021/55511995551199Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop JumpI-Lin Wang0Yi-Ming Chen1Ke-Ke Zhang2Yu-Ge Li3Yu Su4Chou Wu5Chun-Sheng Ho6College of Physical Education, Hubei Normal University, Huangshi 435002, ChinaCollege of Physical Education, Hubei Normal University, Huangshi 435002, ChinaGraduate Institute, Jilin Sport University, Changchun, 130022 Jilin, ChinaGraduate Institute, Jilin Sport University, Changchun, 130022 Jilin, ChinaGraduate Institute, Jilin Sport University, Changchun, 130022 Jilin, ChinaGraduate Institute, Jilin Sport University, Changchun, 130022 Jilin, ChinaDivision of Physical Medicine and Rehabilitation, Lo-Hsu Medical Foundation, Inc., Lotung Poh-Ai Hospital, Yilan 26546, TaiwanDrop jump (DJ) is often used as a plyometric exercise to improve jumping performance. Training from improper drop heights and for improper durations lead to unfavorable biomechanical changes in the lower extremities when landing, which result in reduced training effects and even lower extremity injuries. Purpose. To study the effects of repeated DJ training at drop heights of 30 cm, 40 cm, and 50 cm (drop jump height (DJH) 30, DJH40, and DJH50) on lower extremity kinematics and kinetics. The 1st, 50th, 100th, 150th, and 200th DJs (DJ1, DJs50, DJs100, DJs150, and DJs200) were recorded by using a BTS motion capture system and force platform. The MATLAB software was used to compare the kinematic and stiffness data of DJ1, DJs50, DJs100, DJs150, and DJs200 with one-way ANOVA repeated measure. If there were significant differences, the LSD method was used for post hoc comparisons. Methods. Twenty healthy male Division III athlete volunteers were selected as subjects, and 200 drop jumps (DJs200) were performed from DJH30, DJH40, and DJH50. Results. The jumping height (JH), contact time (CT), and GRF increased with drop height, and the stiffness of the legs and ankle at DJH30 was higher than that at DJH40 and DJH50 (p<0.05). Conclusion. Within DJs200, training at DJH50 yield the high impact easily leads to lower extremity injury; training at DJH30 can increase the stiffnesses of the legs and ankle joints, thus effectively utilizing the SSC benefits to store and release elastic energy, reducing the risk of lower extremity musculoskeletal injury. Therefore, coaches can choose different drop heights and training quantities for each person to better prevent lower extremity injury.http://dx.doi.org/10.1155/2021/5551199 |
| spellingShingle | I-Lin Wang Yi-Ming Chen Ke-Ke Zhang Yu-Ge Li Yu Su Chou Wu Chun-Sheng Ho Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump Applied Bionics and Biomechanics |
| title | Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump |
| title_full | Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump |
| title_fullStr | Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump |
| title_full_unstemmed | Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump |
| title_short | Influences of Different Drop Height Training on Lower Extremity Kinematics and Stiffness during Repetitive Drop Jump |
| title_sort | influences of different drop height training on lower extremity kinematics and stiffness during repetitive drop jump |
| url | http://dx.doi.org/10.1155/2021/5551199 |
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