Lesson
Muscles - continued
Skeletal Muscle Action (contd.)
Neuromuscular activation causes 2 basic muscle-actions:
Isometric or Isotonic
– Isometric = static (foce generated, no joint movement, no change in muscle length)
– Isotonic = there is dynamic action, muscle length changes,
movement occurs
Isotonic can be Concentric or Eccentric
- Concentric (muscle force > resistance, muscle fibers shorten, movement occurs)
- Eccentric (muscle force < resistance, muscle fibers lengthen, typically takes place to slow
down body parts or oppose external resistance)