Lecture 17: Adolescent Nutrition Flashcards
What are the adolescent years?
Between 11 and 19 years
Energy and nutrient needs to support physical growth during adolescence are second only to…
Those during infancy
How does increased independence affect healthy during adolescence?
- They are not fed, they eat
- Choose to go out, not sent out to play
What social pressures come into play during adolescence?
- Body image
- Alcohol
- Drug use
What forms of increased interest in nutrition are prevalent during adolescence?
Both valid and misinformation:
- Fad dieting
- Disordered eating patterns
What are the main concerns about growth and development during adolescence?
- Over-nutrition
- Under-nutrition
- Micronutrient deficiencies
What does the pace of growth look like during adolescence?
Speeds up abruptly and dramatically, significantly increasing energy, protein and micronutrient needs
Sequence of changes is relatively predictable but…
Timing is highly variable:
- That is down to genetics, hormones, diet or other aspects
- Variability is part of normal human diversity
What is biological age?
your physiological age (cells, growth spurts)
What is chronological age?
age from birth
What drives sexual maturation?
Hormones
How much of adult body weight is gained during adolescence?
As much as 50%
What are the distinct differences between genders?
- Skeletal system
- Lean body mass
- Fat stores
Body fat: Boys vs. Girls
Females gain larger % of body fat
Lean body mass: Boys vs. Girls
Males gain more lean body mass than females
How much body fat is needed for menarche?
17%
How much body fat is needed to maintain normal menstruation?
25%
When does body fat peak in females?
Between 15-16 years
How much weight to boys gain on average per year during peak weight gain?
9kg per year
What percent body fat do males have by the end of puberty?
12%
How long does the adolescent growth spurt last?
About 2-3 years
What does females growth velocity look like?
Begins at = 9.5-14.5 years
Ends at = 16 years
Average gain = 25cm
What does males growth velocity look like?
Begins at = 11.5-16 years
Ends at = 17.5 years
Average gain = 28cm
What is Low Energy Availability (LEA)?
Mismatch between a persons energy intake and the energy expended in exercise, leaving inadequate energy to support the functions required by the body to maintain optimal health and performance
What is adequate energy availability?
Continually adapting energy intake to match training load
What is intentional LEA?
Restricting energy intake in the hope that becoming leaner might improve performance
What in unintentional LEA?
Failing to increase energy intake to match a higher training load
Who is most at risk of LEA?
- Sports with emphasis on leanness and physique
- Endurance sports
- Personality traits (perfectionism)
- Social pressure
Who has a higher prevalence of LEA: Elite or recreational athletes?
Recreational
How do we ensure adequate energy intake in relation to exercise needs?
- Regular meals, snacks and recovery options
- Intake modified to reflect variations in training
- Avoid prolonged periods without eating
- Intake meets demands of the sport
What does treatment of LEA require?
Multidisciplinary approach
Girls typically mature ?? years earlier than boys
2.5 years
What is puberty?
A transitional period where reproductive system maturation occurs
When is girls approx. onset of puberty?
9 years
When is boys approx. onset of puberty?
11 years