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type IIX IIA

• been considered reservoir fibers that transform into a more oxidative form upon training to a IIAX toIIA
• although they are strongertheir fatigability renders them less useful when performing many strength power task
• the intensity of the exercise has to be high to activate this fiber
• once activatied consititly to training the transition to type IIAx abd IIa
• detraining results in an increase of IIX

• slow twitch
• higest rating in endurance
• last in force rating

• second highest in endurance
• and 5th in force

• 3rd in endurance
• 4 in force

• 4 endurance
• 3 in force
• oxidative

• 5 in endurance
• 2 in force
• intermediate

• 6 in endurance
• 1 in force
• reservior fiber

•  maximal production when summation is peaked
• plateau

contraction of muscle in response to a stimulus

process of muscle fiber formation

stimulators of myogenesis increase muscle growth

limit muscle growth

a barrier protein complex that inhibits muscle contraction

mechanism wher electrical discharge at the muscle level leads to chemical events stimulation muscle contration

• periosteum
• tendon
• epimysuim
• belly
• perimysium
• facicle
• endomysium
• muscle fiber
• sacromere
• zline
• myosin
• myofibril
• zline actin