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# 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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