CHANGES IN BIOMECHANICAL PROPERTIES DURING DROP JUMPS OF INCREMENTAL HEIGHT
CHANGES IN BIOMECHANICAL PROPERTIES DURING DROP JUMPS OF INCREMENTAL HEIGHT
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DOI：
10.1519/jsc.0b013e318201bcb3
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发表时间：
2011-09-01
影响因子：
3.2
通讯作者：
Peng, Hsien-Te
中科院分区：
文献类型：
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作者：
Peng, Hsien-Te
彭，H-T。渐增高度跳时生物力学特性之变化。J Strength Cond Res 25（9）：2510-2518，2011-本研究的目的是研究生物力学特性随跳高高度增加而变化。16名身体活跃的大学生参加了这项研究，并从20，30，40，50和60厘米（DJ 20-DJ 60）的高度进行跳伞。运动学和动力学数据收集使用11鹰相机和2力平台。记录并分析了3次试验中每种跌落高度的优势腿数据。对不同跳高下的垂直地面反力（vGRF）、冲量、力矩、功率、功和刚度进行了统计比较。DJ 50和DJ 60期间，优势腿的峰值vGRF超过体重的3倍;这些值显着大于DJ 20、DJ 30和DJ 40的值（均p < 0.004）。DJ 60期间的跳跃高度显著小于DJ 20和DJ 30期间的跳跃高度（均p = 0.010）。在接触阶段期间，着陆冲量和总冲量在每个跌落高度之间都有显著差异（所有p < 0.036），并且随着跌落高度显著增加。在起飞冲量上没有显著差异。在DJ 40、DJ 50和DJ 60期间，膝关节和踝关节的峰值和平均功率吸收以及负功显著大于DJ 20和DJ 30期间的峰值和平均功率吸收以及负功（所有p < 0.049）。DJ 60期间的腿部、膝关节和踝关节僵硬度显著低于DJ 20、DJ 30和DJ 40期间（所有p < 0.037）。结果表明，从> 40 cm的高度跳落在机械效率（SSC功率输出）和刚度方面没有优势。不建议从超过60厘米的高度进行跌落跳跃，因为缺乏生物力学效率，而且可能增加受伤的风险。
Peng, H-T. Changes in biomechanical properties during drop jumps of incremental height. J Strength Cond Res 25(9): 2510-2518, 2011-The purpose of this study was to investigate changing biomechanical properties with increasing drop jump height. Sixteen physically active college students participated in this study and performed drop jumps from heights of 20, 30, 40, 50, and 60 cm (DJ20-DJ60). Kinematic and kinetic data were collected using 11 Eagle cameras and 2 force platforms. Data pertaining to the dominant leg for each of 3 trials for each drop height were recorded and analyzed. Statistical comparisons of vertical ground reaction force (vGRF), impulse, moment, power, work, and stiffness were made between different drop jump heights. The peak vGRF of the dominant leg exceeded 3 times the body weight during DJ50 and DJ60; these values were significantly greater than those for DJ20, DJ30, and DJ40 (all p < 0.004). The height jumped during DJ60 was significantly less than that during DJ20 and DJ30 (both p = 0.010). Both the landing impulse and total impulse during the contact phase were significantly different between each drop height (all p < 0.036) and significantly increased with drop height. There were no significant differences in the takeoff impulse. Peak and mean power absorption and negative work at the knee and ankle joints during DJ40, DJ50, and DJ60 were significantly greater than those during DJ20 and DJ30 (all p < 0.049). Leg, knee, and ankle stiffness during DJ60 were significantly less than during DJ20, DJ30, and DJ40 (all p < 0.037). The results demonstrated that drop jumps from heights > 40 cm offered no advantages in terms of mechanical efficiency (SSC power output) and stiffness. Drop jumps from heights in excess of 60 cm are not recommended because of the lack of biomechanical efficiency and the potentially increased risk of injury.