Abstract：
:The aim of the study was to determine the effects of variations in eccentric loading and knee joint range of motion on performance enhancement associated with the stretch-shortening cycle in vertical jumping. Seventeen male elite volleyball players performed three variations of the vertical jump which served as the research model: the squat jump (SJ), countermovement jump (CMJ) and drop jump from a height of 30 cm (DJ30). Knee joint angle (70 degrees and 90 degrees of flexion) at the commencement of the propulsive phase for each jump type was experimentally controlled, with the trunk kept as erect as possible. Force and motion data were recorded for each performance and used to compute a range of kinematic and kinetic variables, including hip, knee and ankle angles, angular velocities, work done, net joint moments and a number of temporal variables. The average of 12 trials for each participant was used in a series of repeated measures ANOVA's (jump xk nee, alpha=.05). From both knee joint angles, an increase in eccentric loading resulted in a significant increase in jump height (DJ30>CMJ>SJ; p<.05). These enhancements were significantly greater (p<.05) for 70 degrees in comparison to 90 degrees of knee flexion. From 70 degrees of knee flexion, these enhancements were due to significant increases in work done at all three joints; while from 90 degrees of knee flexion, only the hip and ankle joints appeared to contribute (p<.05). The amount of enhancement associated with employing the SSC in jumping is dependent upon the interaction of the magnitude of eccentric loading and the range of motion used.
journal_name
Hum Mov Scijournal_title
Human movement scienceauthors
Moran KA,Wallace ESdoi
10.1016/j.humov.2007.05.001subject
Has Abstractpub_date
2007-12-01 00:00:00pages
824-40issue
6eissn
0167-9457issn
1872-7646pii
S0167-9457(07)00033-4journal_volume
26pub_type
杂志文章abstract：:Prior research has found that the level of regularity in the output of numerous physiological systems is lowest in healthy young adults and higher in groups such as the elderly and those with various diseases. Vascular restriction has been found to stimulate exercise induced responses, including greater muscle activat...
journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2013-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2001-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章,评审
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/s0167-9457(02)00160-4
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journal_title：Human movement science
pub_type： 杂志文章
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2015-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.01.008
更新日期：2017-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2007.03.003
更新日期：2007-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2007.08.001
更新日期：2008-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2014.09.006
更新日期：2015-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2016.01.004
更新日期：2016-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2014.11.014
更新日期：2015-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章,随机对照试验
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更新日期：2019-08-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2015.12.004
更新日期：2016-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2003.11.001
更新日期：2004-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2005.10.003
更新日期：2005-10-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.05.001
更新日期：2012-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2016.05.001
更新日期：2016-08-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2020-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2020-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2009.12.004
更新日期：2010-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2013-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2014-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2015-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2018-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
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更新日期：2002-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2014.10.006
更新日期：2015-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2019.02.009
更新日期：2019-04-01 00:00:00
