Lesson 19: Brain Age Changes and Youth Football

Question 1

How many neurons are added for minute during gestation?

Answer 1

250,000

Question 2

At what age is the brain 95% by size?

Answer 2

age 6

Question 3

At what age range is the brain 100% by size?

Answer 3

10-20

Question 4

At what age range is the brain at peak power?

Answer 4

22-27

Question 5

What happens to grey matter during adolescence?

Answer 5

pruning, 10 percent reduction of grey matter over teen years

Question 6

When does myelination start?

Answer 6

at borth

Question 7

When does myelination start?

Answer 7

at birth

Question 8

When is myelination complete?

Answer 8

18-22

Question 9

What do unmyleinated fibers do?

Answer 9

cause more injuries that recover slower

Question 10

What does the paper on first exposure to American football and longterm outcomes show?

Answer 10

that the earlier that kids were exposed to football, the more they were likely to have impairments

Question 11

What ages is the peak maturation time of gray and white matter?

Answer 11

9-12

Question 12

What did a study find about cumulative head impacts?

Answer 12

adding all of the head impacts together is a good indicator of later apathy and executive function

Question 13

How many head impacts did Pop Warner’s team have after implementing rule changes compared to others that did not?

Answer 13

158, while others had 300

Question 14

What was the finding about concussion weight tolerance for kids v. adults?

Answer 14

kids have a way lower concussion weight tolerance v. adults

Question 15

How much does the 5 star helmet reduce head acceleration compared to the 3 star?

Answer 15

1/2