Abstract：
:The purpose of this study was to investigate the effect of knee extension/flexion and fatigue on muscle co-activation of the Rectus Femoris (RF) and Biceps Femoris (BF) during the eggbeater kick. Ten national level male water polo players executed eggbeater kicks at maximum effort for the duration of the test. The eggbeater kick cycle was divided into four phases (FLX1, FLX2, EXT1, EXT2). Surface electromyographs were recorded from RF and BF. EMG activity normalized to the maximum voluntary isometric contraction, muscle co-activation (CCI) and angular velocity (AV) of the right and left knee were calculated. Highest levels of RCCI and LCCI were observed during final phase of flexion (FLX2) and initial phase of extension (EXT1) (p<0.05). FLX2 and final phase of extension (EXT2) revealed the highest AV during the cycle. A decrease in CCI was observed with fatigue for FLX2 while AV was reduced for all phases. During the cycle RF and BF act as agonist/antagonist to accelerate and decelerate knee flexion/extension. The high AV and low CCI levels observed for EXT2 might increase joint instability and consequent risk of injury. This knowledge provides a better understanding of the mechanisms involved in stabilizing and controlling the knee during underwater movement.
journal_name
Hum Mov Scijournal_title
Human movement scienceauthors
Oliveira N,Sanders RHdoi
10.1016/j.humov.2016.11.006subject
Has Abstractpub_date
2017-01-01 00:00:00pages
82-90eissn
0167-9457issn
1872-7646pii
S0167-9457(16)30236-6journal_volume
51pub_type
杂志文章abstract：:Recent data support the idea that movements play a crucial role in letter representation and suggest that handwriting knowledge contributes to visual recognition of letters. If so, using different motor activities while subjects are learning to write should affect their subsequent recognition performances. In order to...
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
doi：10.1016/j.humov.2018.12.005
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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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pub_type： 杂志文章
doi：10.1016/j.humov.2016.12.004
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2008.01.001
更新日期：2008-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.01.002
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2013.10.007
更新日期：2014-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2019.06.009
更新日期：2019-06-28 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2005.12.005
更新日期：2006-06-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.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.2014.10.001
更新日期：2014-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.10.012
更新日期：2018-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2019.06.003
更新日期：2019-06-27 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2007.04.002
更新日期：2007-08-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/s0167-9457(02)00169-0
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.08.009
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2008.09.001
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.03.001
更新日期：2011-12-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102748
更新日期：2021-02-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102592
更新日期：2020-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2015.03.005
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
doi：10.1016/j.humov.2019.02.009
更新日期：2019-04-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2010.05.005
更新日期：2011-08-01 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：2020-08-01 00:00:00
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journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.07.005
更新日期：2012-06-01 00:00:00
