EDKP 395 Lecture Notes - Lecture 11: Muscle Memory, Endurance Training, Intramuscular Fat
17 Dec 2012
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Document Summary
Peripheral feedback from working muscle: group iii & iv nerve fibers. Central command: motor cortex, cerebellum, basal ganglia. Information from working fibers with either have 1 of 2 effects at the level of the spinal cord. Regulated in parallel lines (occur at same time very efficient) During activation of muscle (ex. beginning of contractions) Activation of motor cortex, cerebellum, basal ganglia: motor recruitment increases to match the work rate. Inc. vo2 (i. e. delivery & supply of o2 to muscles) to match the work being done: co-activation of cardiorespiratory control centers. Decreases bf to visercal organs inc. bf to exercising muscles. Biochemical changes in muscle due to endurance training influence the physiological response to exercise. Reduction in feedback from chemoreceptors in trained muscle and a decreased need to recruit motor units to accomplish an exercise tasks results in reduced sns, hr, ventilation responses to submax. Rapid decrease in vo2max: ~8% in 12 days, 20% after 84 days.
