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
