L5.3.3.5: Effect of Exercise on Muscles

• EFFECT OF EXERCISE ON MUSCLES

  ● Exercise increases muscle size, strength, and endurance

  ○ Aerobic (endurance) exercise (biking, jogging) results in stronger, more flexible muscles with greater resistance to fatigue

  ■ Makes body metabolism more efficient

  ■ Improves digestion, coordination

  ○ Resistance (isometric) exercise (weight lifting) increases muscle size and strength
• THE 5 GOLDEN RULES OF SKELETAL MUSCLE ACTIVITY

  1. With a few exceptions, all skeletal muscles cross at least one joint
  2. Typically, the bulk of a skeletal muscle lies proximal to the joint crossed
  3. All skeletal muscles have at least 2 attachments: the origin and the insertion
  4. Skeletal muscles can only pull; they never push
  5. During contraction, a skeletal muscle insertion moves toward

  the origin