KINE 1020 Lecture Notes - Lecture 30: Sarcopenia, Osteoporosis, Body Composition

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 1020
• Professor: Heather Edgell

Document Summary

As we age, msk + cv health and fitness tend to decrease, with the. Extent of the decrease being dependent on the level of pa and. Sarcopenia is the term used to describe the loss of muscle mass associated with aging. Osteopenia similarly describes the loss of bone mass with aging, as seen in osteoporosis. Sarcopenia impacts 10-25% of adults < 70 yrs and ~40% of adults >80 yrs. Approximately 1-2% of muscle is lost per yr after 50 yrs. Factors contributing to loss of muscle mass and strength: decrease in whole muscle size; Whole muscle size peaks around 24 yrs and is well maintained up to. Between 50-80 yrs there is an additional 30% reduction in muscle size (total = 40%) The decrease in muscle size is mirrored by a loss of fibre # Atrophy at the fibre level (~ 25% reduction to the size of type ii fibres, compared to no change in type i: fibre type composition;