SSEH3345 Lecture Notes - Lecture 11: Bone Density, Motor Unit, Sarcopenia
16 Jun 2019
School
Department
Course
Professor
Document Summary
The effect of system change on movement: postural control during standing and walking, falls in older adults (intrinsic and extrinsic fac) Given the changes taking place as we age, how would you choose to move through an open environment. Shortening of stature (disc compression, spinal misalignment, weakening of postural muscles) Osteoporosis (reduction of bone mineral density, inc. vulnerability to fractures, slow healing) Resistance training (speci c bones need to be loaded) Strongly associated with decreased force production (mvc) Motor units - motor neurons and muscle bres. Motor units represent the functional unit of the motor system. Link between the nervous system and muscle. Age-related changes in motor unit properties result in a marked decline in most aspects of movement. Motor neurons die (denervation) > progressive atrophy and disintegration of the denervated muscle bres. Surviving motor neurons innervate additional muscle bres (reinnervation via collateral tonal sprouts by the surviving motor units)
