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Steady state responses to exercise (neuromuscular and energy)

steady state responses to exercise (lesson 2)

junaid khaliq

on 17 July 2014

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Transcript of Steady state responses to exercise (neuromuscular and energy)

Overview of cardiovascular and respiratory responses
Neuromuscular responses
Inc transmission rate of nerve impulses
Muscle spindles and golgi tendons provide sensory information about intensity of exercise allowing smooth, coordinated movement patterns
Training to enhance ATP transfer capacity requires repetitive, intense, short duration exercise
Golgi tendons located within the tendons and sensitive to stretch
Neuromuscular responses
Energy system responses

Increased pliability of muscles
Muscles spindles located within muscle fibres known as intrafusal fibres
Increased pliability of muscles
When spindle is stretched a message is sent to the CNS via nerve impulses
CNS decides how many motor units need to be contracted to allow smooth movement
More adapted body is to steady state exercise = efficient muscle spindles
Tendons send info to the CNS concerning strength of muscle contraction
Golgi tendon and muscle spindles then facilitate smooth movement patterns
Increased transmission rate of nerve impulses
Energy system responses
ATP production
Aerobic energy system
Krebs cycle
Anaerobic glycolysis
Pyruvate oxidation and krebs cycle occur in mitochondria whereas ETC takes place in the inner membrane
Produces continuous supply of electrons to feed the ETC
Cellular site of aerobic respiration
Each cycle produces 3 NADH, 1 FADH2, 1 ATP, 2 CO2, 1 oxaloacetete
Rotates twice for every glucose molecule used (producing 6 NADH)
Molecules are important... carry electrons into the next stage of glucose respiration
Electric transport chain
Series of biomechanical reactions during which free energy contained within hydrogen (from krebs cycle) is released
This enables ATP synthesis during aerobic respiration
Occurs in mitochondria
Each reaction involves electron molecule which has a particular attraction for hydrogen
Final link is oxygen... which combines the hydrogen and electrons to form water
Activities chosen should engage muscles in movement which the athlete wants to improve anaerobic power
Achieves two goals:
enhances metabolic capacity of engaged muscle tissue/fibre
improves neuromuscular adaptations to sport specific pattern of movement
When ATP splits some energy is lost as heat which is why exercise produces heat
During SS exercise muscles lengthen easier as the spindles become more comfortable
The ability of a solid substance to stretch
Involves the oxygen transportation system and the use of mitochondria in working muscles for oxidation of glycogen and fatty acids
Known as aerobic because of its reliance on oxygen
Involves the breakdown of glycogen in the absence of oxygen - ATP + lactate
Lactate ends this energy system after 40-60 seconds of max effort
Fuel depends on duration and intensity ... fatty acids used for long exercise and glycogen used for high intensity aerobic exercise or anaerobic system
Series of aerobic reactions .. take place in mitochondria
Heat increases speed of transmission involving nerve impulses
Full transcript