Class Notes (835,008)
Canada (508,866)
PEDS207 (22)
Jody Virr (22)
Lecture

Sept 27 - Development and Aging.doc

8 Pages
44 Views
Unlock Document

Department
Physical Education and Sport
Course
PEDS207
Professor
Jody Virr
Semester
Fall

Description
Sept 27 – Development and Aging Adipose Tissue in Older Adult • Both men and women tend to gain fat during adulthood, but this isn’t inevitable • Increases in trunk fat are notable, but subcutaneous fat on limbs tends to decrease Fat can be a constraint when it decreases ROM Excess fat is stored in lipocytes, which expand Endocrine System • Plays role in regulating growth and maturation through chemical substances called hormones • Excess of deficiency can alter growth Major hormones involved in growth include: • Pituitary growth hormone • Thyroid hormones and • 2 gonadal hormones • We will also talk about the role of insulin • These hormones stimulate protein anabolism (tissue builidng) • Endocrine – neurological feedback loops regulate hormone levels • Each hormone may have a critical role in development at specific phases in life span • insulin plays indirect role, is vital for carb metabolism • hypothalamus is the regulating center for hormones and has a neural and blood connection. It can be stimulated by neurons or through blood. • Pituitary gland secretes GH and TSH, which goes to the thyroid glad to tell it to start producing hormones • Thyroid produces epinephrine and androgens • Testes produce testeosterone and estrogen Growth Hormone • Growth hormone is secreted by anterior pituitary • It is necessary for normal growth • Deficiency can result in growth abnormality • Dwarfism is an example of what can happen if we don't produce enough GH • If we produce too much GH, then we can see gigantism Effects of Abnormal Growth Hormone Secretion • Dwarfism – decreased GH secreteion in children • Gigantism – increased GH secretion in children • Acromegaly – increased GH secretion in adults Hormones can only act on a specific tissue Thyroid Hormones • these are secreted by thyroid gland • they influence whole-body growth • one plays a role in skeletal growth • if we don't have TH, the growth hormone cannot act to its full potential (ex. Wont reach our full potential height) • if we have too low levels of thyroid hormone, this is called hypothyroidism. This is associated with weight gain. Too much thyroid hormone is hyperthyroidism. This will cause high protein catabolism • hypothalamus regulates the anterior pituitary. The anterior pituitary regulates the thyroid gland Gonadal Hormones • influence on growth, sexual maturation (sex organs, secondary sex characteristics) Androgens • secreted by testes (boys), adrenal glands (boys, girls) • hasten epiphyseal growth plate closure (skeletal maturation) • promote growth of muscle mass (adolescence) Estrogen • secreted by ovaries (girls), adrenal cortex (girls, boys) • hastens epiphyseal growth plate closure • promotes accumulation of fat • is it also involved in bone growth • both men and women have testosterone but the levels are different • if someone has a high level of androgens, they will look short and larger amount of muscle mass and a lot of stereotypical male characteristics. • Steroid users will encourage epiphyseal plates to close early and they will not reach their full height • If estrogen is too low, we wont develop enough sex characteristics Insulin • Secreted by the pancreas • Insulin helps circulate and metabolize carbs, and stimulate metabolism of amino acids to build proteins • Stimulates transportation of glucose and amino acids • Helps build tissue • Its presence is necessary because it helps GH function optimally • A deficiency in insulin will decrease protein synthesis and this will be detrimental to growth Endocrine System in Older Adults • imbalance may develop between nervous, endocrine, and immune systems • thyroid disorders are more prevalent • Decreasing gonadal hormone levels are associated with loss of bone and muscle tissue • If this system isn’t operating fully, this increases our risk for disease • Thyroid disorders are common for adults 20-30 • Thyr
More Less

Related notes for PEDS207

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit