CHAPTER 4:
NEUROMUSCULAR

CONCENTRIC
CONTRACTION

CONCENTRIC

MUSCLE SHORTEN

UPWARD PHASE

PULLS THE FOREARM TO
CAUSE THE FLEXION

ECCENTRIC

MUSCLE LENGTHEN

DOWNWARD PHASE

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

SLOW TWITCH (TYPE 1)

SMALLER IN DIAMETER

AEROBIC RESPIRATORY (SUPPLY ATP)

CONTAIN MITOCHONDRIA

FIRE SLOW, TAKE LONG TIME TO FATIGUE

STORE OXYGEN IN MYOGLOBIN

FAST TWITCH

TYPE IIA

LARGE DIAMETER

WHITE IN COLOR

LESS MITOCHONDRIA

USES SUPPLY ATP (ANAEROBIC & AEROBIC)

IIB/X

PHYSICAL SAME LIKE TYPE IIA

USES THE GLYCOLYTIC (ANAEROBIC SYSTEM)