Study Effects Of The Sports Load’s Influence To VFT Task Based On The Method Of NIRS

Objective: using the near infrared spectroscopy objectively to reflect thebrain activation during cognitive activities before and after exercise, from thefoundation to provide support for cognitive nerve, and to make physiologicalexplanation for the change of cognitive ability after movement intervention.Mainly three parts will be discussed as follows: to explore the difference ofthe blood oxygen metabolism of the cerebral cortex during cognitive taskamong healthy college students and during quiet state in order to study thebrain activity characteristics during cognitive tasks. The study also exploresthe possible mechanism of sports intervention on cognitive activities by thechanges of blood oxygen metabolism of the cerebral cortex during cognitivetask of healthy college students before and after exercise.Methods: by using22-channel near infrared spectroscopy （NIRS）, welearn the brain activation of14healthy college students before and afterexercise language with a fluency task （VFT）. Through exercise interventionsand comparing the different brain activation, we understand the influence ofthe movement intervention on the cognitive activities, and to understand theinfluence on cognitive ability.The results: 1. Without movement intervention doing VFT task brain activated channelsare2,3,4,8,12,13,17,（P <0.05）, among them7channel is significantactivation （P <0.01）. There are eight channels being activated. The regionsbeing activated are temporal lobe area and forehead back the lateral area.With contrast to task A, when ding task B changes of each index are:deoxidization hemoglobin concentration （△HHb） reduced, oxygen andhemoglobin concentration （△HbO₂） increased significantly （P <0.05）, andthe total hemoglobin concentration （△tHb） increased significantly （P <0.05）.2. During the process of movement, changes of the pulse every minute: at thefirst three minutes due to small load, pulse change is quite gentle, and then asthe load increases and the movement continues, pulse is rising continuouslyand reach maximum before exhaustion, pulse number, then graduallydecreases. At the end of the movement, pulse is about180per minute, closeto human’s maximum heart rate （220-age）. During increasing load movementprocess, every class load is called RPE value. Before75W, exercise load israther small, so RPE value change is small. With the increase of load, RPEvalue gradually raised and reached the maximum20before exhaustion, in200W or so. Further analysis tells us that the pulse of the changing trend is in linewith value RPE trend t each level.3. After movement intervention and doing VFT tasks brain activate channelsare2,3,4，6,7，8，11,12（P <0.05）. Among them2, channel has significantactivation （P <0.01）. There are eight channels being activated. Brain areas being activated are the regional temporal lobe area and forehead back thelateral area. With contrast to task A, when ding task B changes of each indexare: deoxidization hemoglobin （△HHb） reduced, oxygen and hemoglobin （△HbO₂）increased significantly （P <0.01）, and the total hemoglobin （△tHb）increased significantly （P <0.05）.4. Before motion doing VFT task and after intervention with sports VFT tasks,oxygen hemoglobin concentration changes of （train HbO₂）22channels are allelevated. Sports convalescence after intervention, changes of oxygenhemoglobin concentration （train HbO₂） are slightly greater than that of beforemovement. The number of channel being activated is8, and the regions areforehead back area, and there are no unbiased differences. When doing task Athe average pulse is less than that of doing B tasks, before motion less thansports. When doing VFT task before and after exercise, such hemoglobinconcentration variation （train HHb） change is not big; oxygen andhemoglobin concentration change （train HbO₂） is slightly bigger than beforemovement; total hemoglobin concentration change （train tHb） is also a littlebigger than that after movement.Conclusion:For sports intervention, the task of the cerebral cortex VFT when bloodoxygen metabolism changes and quiet state of the baseline, the brainprefrontal significant activation, and no partial lateral differences, VFT task of oxygen and hemoglobin increase, deoxidization hemoglobin reduce, totalhemoglobin increase.（P <0.05） Activate channels of the correspondingregion to concentrate on the forehead back the outer regions, his forehead is tocontrol the outer regions back the main area of the language function. Wordsfluency task than words repetitive tasks, the brain activated obvious, B tasksHbO₂accidents is far higher than A task HbO₂task accidents, that is the morecomplicated the task to use the more neurons, neurons activities will causeblood oxygen changes, the greater the change of HbO₂accidents.The brain activated the performance for the movement after interventionthan sports with before: after HbO₂> exercise interventions accidents beforeexercise HbO₂accidents, movement after intervention tHb> accidents beforeexercise tHb accidents, sports recovery brains are still higher metabolic state.The pulse of the before and after exercise: after several> exerciseinterventions pulse before motion pulse number. Further to the before andafter exercise blood oxygen change and pulse change carries on thecomparison, the change trend is consistent.