CHAPTER 4: NEUROMUSCULAR

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CHAPTER 4: NEUROMUSCULAR

SLOW AND FAST TWITCH MUSCLE FIBER

FAST TWITCH

IIB/X

USES THE GLYCOLYTIC (ANAEROBIC SYSTEM)

PHYSICAL SAME LIKE TYPE IIA

TYPE IIA

USES SUPPLY ATP (ANAEROBIC & AEROBIC)

LESS MITOCHONDRIA

WHITE IN COLOR

LARGE DIAMETER

SLOW TWITCH (TYPE 1)

STORE OXYGEN IN MYOGLOBIN

FIRE SLOW, TAKE LONG TIME TO FATIGUE

CONTAIN MITOCHONDRIA

AEROBIC RESPIRATORY (SUPPLY ATP)

SMALLER IN DIAMETER

TYPES MUSCLE CONTRACTION

CONCENTRIC CONTRACTION

ECCENTRIC

SLOWS THE LOWERING OF FOREARM AND CONTROL THE EXTENSION OF THE ELBOW

DOWNWARD PHASE

MUSCLE LENGTHEN

CONCENTRIC

PULLS THE FOREARM TO CAUSE THE FLEXION

UPWARD PHASE

MUSCLE SHORTEN