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Abstract Details

Abstract Title

Changes of the Brain Function and the Competitive Structure Characteristics of α Frequency Brand in Gymnasts in Different Training States

Abstract Theme

Neuroscience and sport

Type Presentation

Poster

Abstract Authors

Presenter LIZHI - Guangdong Provincial Institute of Sports Science (Exercise testing center) - CN
LI Jie - Sports Bureau of Guangdong Province (.Scientific Research and Education Department) - CN
Hong Ping - China Institute of Sport Science (Reseatch Department) - CN
WU Ying - Shanghai University of Sport (School of Physical Education and Training) - CN

Presentation Details

Poster Exhibition Site (Local): Orange - 5        Date: 2 September        Time: 8am to 7pm        Presenter: li zhi

Abstract Resume

Background:To investigate the levels of central function and training states of China's national women's gymnastics athletes who preparing for London Olympic Games in different
training periods. At the same time to explore changes of brain function and competitive structure characteristics of EEG α frequency brand in different training states, which is of value for gymnasts
training monitoring and selection.Methods:Fourteen national female gymnasts were to be monitored during the preparation for two games, national championship and Olympic Trials, May,
2012, and London Olympics, July, 2012. The athletes’ states were divided into initial state, high volume state, high intensity state, or pre-competition state. In each state, EEG was measured, and we
made a comparative study of central fatigue index, excitement-inhibition index, brain function index, competitive structure of α frequency Brand and EEG entropy changes. Results: (1)
In the same state, there were no significant differences between Olympic athletes and non-Olympic athletes for central fatigue index, excitement-inhibition index, and brain function index. Compared
with initial state, central fatigue index, excitement-inhibition index, and brain function index increased significantly in high volume state; central fatigue index and excitement-inhibition index
increased significantly in high intensity state;  excitement-inhibition index increased significantly in pre-competition state. (2) The results showed that EEG of Olympic athletes was more stable with
obvious dominant frequency advantage and insusceptible to other frequencies. Compared with initial state, percentage of dominant frequency decreased significantly in high volume state, and increased
significantly in high intensity state and pre-competition state. These had been linked to more training methods and new exercises in high volume state, while less training methods and new exercises in
high intensity state and pre-competition state. (3) In the same state, entropy values of Olympic athletes was lower than that of non-Olympic athletes. It suggested that EEG of Olympic athletes has
characteristic of low competitive frequency-fluctuating uncertainty and high order. Compared with initial state, entropy values tended to be higher in high volume state, and lower in high intensity
state and pre-competition state. It might be related to more training methods, more complicated exercises and less combinations in high volume state, while less training methods, less complicated
exercises and more combinations in high intensity sate and pre-competition state.Conclusions: (1) central fatigue index, excitement-inhibition index, brain function index, percentage
of dominant frequency or entropy vary in different states, which can be used for training monitoring. (2) The  EEG of Olympic athletes has characteristic of obvious dominant frequency advantage, high
stability, strong cooperativity , and high order, which can be used for selection.
Key words: brain function; competitive frequency-fluctuating structure; entropy; gymnastics; training monitoring

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