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93 lines
3.1 KiB
93 lines
3.1 KiB
# Muscle Fatigue
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"decrease of a muscle's ability to maintain tension/power over time"
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no oxygen -> that makes lactic acid
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lactic acid is short term
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fatigue - can no longer preform level of activity
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often oxygen debt
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recover period, failure / rest
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preform glycolysis, liver breaks down lactic acid into glucose USING ATP
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(only works in rest period)
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cori cycle
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muscles have different fiber types - therefore has different fatigue
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* type I - slow oxidative
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* type IIa - fast oxidative
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* type IIx - fast glycotic
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all muscles have all fivers, density is the key differentiators
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## Slow oxidative Muscle Fibers (Type I)
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* "slow twitch"
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* works in oxygen, and moves slowly
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* structural characteristics
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* small muscle diameter
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* more vascularity/high capillary density + high mitochondria density -> aerobic!
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* Metabolic characteristics!
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* take three times longer to contract ( slowest of all fibers) -> sustained movement (fatigue resistant)
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* impulse to move is 3 times slower than others
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* contains myoglobin -> stores oxygen (short term)
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* function
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* first muscle fibers to be recruited (low power)
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* run marathons (can be used for hour+)
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* anti-gravity + posture muscles
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* basically hard to wear out. the marathon muscle
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## fast oxidative fibers (type IIa)
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* structural characteristics
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* humans largest diameter muscle fiber
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* highly vascularizaion + high density density of mitochondria -> aerobic!
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* high density of muscle glycogen / some myoglobin
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* Metabolic characteristics
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* **can** utilize **anaerobic respiration**
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* glycolysis
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* creatine phosphate to ADP = some ATP
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* can add some extra fatigue resistance to the muscle
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* fast contractility -> moderate fatigue resistance
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* function
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* 2nd recruitment order -> moderate power
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* walking/sprinting (longer than one minute, shorter than 30 minutes)
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## Fast Glycolytic (Type IIx)
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* Structural Characteristics
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* intermediate diameter (humans)
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* "white fibers" -> paleish pink
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* very little vascularity , mitochondria -> almost no aerobic respiration
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* high muscle glycogen / little to no myoglobin
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* use as much energy as fast as possible
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* metabolic characteristics
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* primary anaerobic
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* Glycolysis
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* Creatine phosphate + ADP = some ATP
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* Fastest Contractily -> Lowest fatigue resistance
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* makes some ATP quickly -> uses it much faster
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* function
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* 3rd recruitment order -> highest power
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* heavy weight training / burst power (less than 60 sec)
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## Changes in density
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* genetics + enviornmental stress
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* hypertrophy vs atrophy
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* changes density of muscles
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* endurance exercise (trend to type Ia)
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* angiogenesis (increase amount of blood vessles to the muscles)
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* increase myoglobin + mitochondria
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* resistance exercise (trend to type II's)
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* damage leads to increase in mass
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* literally split muscle fibers -> repaired bigger
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* increase in myofibrils )size and number)
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* increase in glysosomes (store glycogen))
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* strengthens Connective Tissue, tendons, and bones
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basically as you train, the muscles work on making it easier by handling those
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muscle memory: going back to state of athletic state, enviornmental stress
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