Effects of Unilateral Hand Contraction on The Persistence of Hemispheric Asymmetry of Cortical Activity
Effects of Unilateral Hand Contraction on The Persistence of Hemispheric Asymmetry of Cortical Activity
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DOI：
10.1027/0269-8803/a000215
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发表时间：
2019-04-01
影响因子：
1.3
通讯作者：
Masaki, Hiroaki
中科院分区：
文献类型：
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作者：
Hirao, Takahiro;Masaki, Hiroaki
运动员在进行体育活动之前立即用左手挤压球，并没有在严重压力下表现出性能下降（Beckmann，Gropel，& Ehrlenspiel，2013）。这个结果不能用右半球的启动来解释。然而，目前还不清楚哪些变量对不对称的大脑活动影响最大（例如，挤压球的持续时间和强度）。我们假设，长时间用力挤压球可能会导致更强的不对称活动，因为运动相关区域会因更有力的运动而增加激活。我们用脑电图（EEG）来研究用单侧手挤压球所产生的大脑活动的半球不对称性。在基线期间以及在八个实验条件下，其中挤压球的强度和持续时间进行了评估EEG。我们的研究结果表明，右半球。当参与者用他们的左手挤压一个内部压力为100 hPa的球90秒或20 hPa的球30秒时，优势脑激活最大化。而且。用100 hPa的内压挤压球90 s产生了显著的半球间皮层活动不对称性。我们猜想，长时间用力挤压一个球可能有助于处理压力下的“窒息”，因为它会产生更大的右半球激活。这一结果可能有助于改善竞技运动员的简单方法，以减少表现出窒息行为的可能性，即使在比赛期间的短暂休息期间，也可以用最小的努力来练习。
Athletes who squeezed a ball with their left hand immediately prior to execution of sports activities did not show performance deterioration under severe pressure (Beckmann, Gropel, & Ehrlenspiel, 2013). This result has beer explained by priming of the dominant right hemisphere. However, it remains unclear what variables have the greatest effect on asymmetrical brain activity (e.g., duration and strength of ball squeezing). We hypothesized that squeezing a ball harder for a longer period might lead to stronger asymmetrical activity because motor-related areas would have increased activation due to the more forceful movement. We used electroencephalograms (EEGs) to investigate the hemispheric asymmetry of brain activity produced by squeezing a ball with a unilateral hand. EEGs were assessed during a baseline period as well as in eight experimental conditions wherein the strength and duration of the ball squeeze were manipulated. Our results showed that right-hemispheric. dominant brain activation was maximized when participants squeezed with their left hand a ball that had an internal pressure of 100 hPa for 90 s or 20 hPa for 30 s. Moreover. squeezing the ball with 100 hPa internal pressure for 90 s created a prominent interhemispheric asymmetry of cortical activity. We suspect that squeezing a ball strongly for a long period might be helpful in dealing with "choking" under pressure by producing greater right-hemispheric activation. This result could help improve simple methods for competitive athletes to reduce the likelihood of exhibiting choking behavior that could be practiced with minimal effort, even during short breaks during a game.