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)

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