Health Sciences 4074A/B Lecture 3: Musculoskeletal Changes with Age
2 Feb 2019
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Document Summary
Learning objectives: describe the impact of physical activity on functional declines in older adults. Slower nerve conduction speed: motor neuron loss, muscles of older adults are less fatiguable then younger adults during slow contractions. Inflammation of the joints: 100 different types, can affect one or multiple joints. Unable to walk so now in wheelchair: once you cross this threshold the mortality rate is thin. If you cannot recover within five years you are dying: what might contribute to the difference between the blue and orange lines, physical activity/exercise major component to reducing the steep of decline, nutrition, environment, genetics, drinking/drugs, ses. Factors that change with age and affect physical activity/function: muscle size, strength, power, speed of movement, nerve conduction speed, bone density, these factors are infleucned by other factors and influence other factors. Muscle contraction: motor unit, single motor neuron and all the muscle fibres it innervates, motor neuron connects with many muscle fibers.
