1. 12/9/14 Today’s Agenda:
Students will take an Edmodo quiz over stresses of injury to soft tissues.
Student will use an iPad/weebly to create flash cards for:
Mechanisms of soft tissue injuries
12 terms from last class
Mechanisms of skeletal muscle injuries
13 terms this presentation
Bring to Miss Williams for a class assignment grade when finished (easy 100).
Students will have a quiz over mechanisms of skeletal muscles injuries next class. Use your flash cards to study.

2. Mechanisms of Skeletal Muscle (mm) Injuries
1. Contusion
Deeper contusion = more severe
Extra blood forms a membrane encapsulated blood tumor
2. Strain – stretch/tear/rip in mm fascia, or tendon
MOI
Forceful muscle contraction
Nuero-inefficiency of agonist/antagonist contractions
Strength imbalance b/w agonist/antagonist muscles

3. 3. Cramps 4. Spasm 5. Guarding Painful involuntary contraction
Usually due to dehydration and electrolyte loss
4. Spasm
Reflex contraction caused by trauma to upper motor neuron or musculoskeletal system
5. Guarding
Protective mechanism that causes an involuntary contraction following injury

4. 6. Muscle Soreness 7. Muscle Stiffness Acute-onset Delayed-onset
Accompanies fatigue and occurs during and immediately after exercise
Delayed-onset
Onset is 12 hours post-exercise
Most intense hours post-exercise
Relief within 3-4 days
7. Muscle Stiffness
Occurs when a group of muscles have been over-exerted for a prolonged period

5. Mechanisms of Chronic Skeletal mm Injuries
8. Myositis - inflammation of muscle tissue 9. Fasciitis - inflammation of tissue separating mm 10. Tendinitis - inflammation of tendon 11. Tenosynovitis - inflammation of synovial sheath surrounding tendon 12. Atrophy - muscle wasting 13. Contracture - shortened muscle