HK 368 Lecture 20

VO2 max _____ with aging

decreases

VO2 max in normal active older people decreases ____% every decade

10%

in older male athletes decline ___% per decade

5-6%

Max SV ____ with age

decreases

• less contractility, response to catecholamines

• partial loss of Frank Starling mechanism (less preload)

• arterial stiffening

  • decline in SV max can be combated with excercise

Peripheral blood flow ____ with aging

decreases

• due to increase in vasoconstriction and

  • decrease in vasodilation

Strength and neuromuscular function ____ with age

decrease

Changes in body composition

• bod fat tends to increase

• fat free mass decreases starting around age 40

Size and number of muscle fibers ____ with age

Decreases

• size of both type 1 and 2 decrease

• loss of 10% per decade after age 50