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Western University
Kinesiology 1080A/B
Matthew Heath

Kin 1080 – Feb. 13, 2013 CDC  Centres for disease control Conussion Research - Research is being done to restrict the venous flow to stop the brain from moving around so much and experience severe forces that will damage the axons  concussion_1.html - Impact Battery Test: it is a neuropsychological test (cognitive motor & sensory ability test - measure of behaviour) to compare the athlete’s performance after a concussion relative to before the concussion to see if the athlete has recovered enough to return to the sport  The neuropsychological profile has to return back to profile before the athlete can resume playing  This is not the most accurate evaluation Motor Unit Types 1) Fast twitch, fatigable (FF) (Fast Motor Unit)  They are characterized by the highest conduction velocity (100m/s)  They have a large fibre diameter  They innervate fast twitch muscle fibres  The reason why these have a high velocity is due to the large diameter of the fibre  This means that the fibre is heavily myelinated and are able to conduct the impulses extremely fast 2) Fast twitch, fatigue resistant (FR)  Characterized by medium conduction velocity (60m/s)  They have a medium fibre diameter and are able to innervate both fast and/or slow twitch muscle fibres 3) Slow twitch, fatigue resistant (SR) (Slow Motor Unit)  Characterized by a slow conduction velocity (40m/s)  The fibre has a small diameter and is only able to innervate slow twitch muscle fibres ERP Measures of Cognitive Processing (Neurophysiological research) 1) Event-related Potentials (ERPs)  They are averaged electrical brain responses to the time-locked stimuli  It is measured through an EEG and it measures the electrical activation of the cortex (neuronal activation)  Generally, an individual is repeatedly exposed to a stimuli and the brain is evaluated how it responds to that stimuli 2) N2pc = ERP  event related to brain potential  It is a component that focuses on visuospatial attention 3) P300  Another component that is a measure of a stimulus classification that processes speed Why does one get a second concussion?  It is mostly likely because the visuospatial processing is affected from the first concussion  That individual would be very poor at classifying different stimuli (Ex. Teammate approaches you but the individual could easily mistake him/her for an opposing player)  The ERP is used to evaluate the consequence that has caused the athletes to nd have a 2 concussion De Beaumont Study There were 3 groups of athletes: Athletes who have not had a concussion, athletes who have had 1 concussion & athletes who’ve had 2 or more concussion. The athletes who have had a concussion were removed from the event that caused the concussion for 9 months.  Impact Battery Tests were given to each athletes and there were around 12 different kinds of tests that included: verbal fluency, psychomotor ability, digit- repeat test, colour trails task (classifying stimuli)  The tests were the same for each athlete and the groups did not differ in their performance on the Impact Battery Test  This shows that all groups have the same neuropsychological profile  This ultimately means that it was safe for the athletes who’ve had a concussion to return to their sport; however, the study about the 3 different gr
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