BIOS1168 Tutorial Notes PDF

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ELBOW MUSCLE RECRUITMENT PATTERNS Objective 15.12 1. List the muscle which move the elbow & radioulnar joints i.e. elbow flexors & extensors, forearm pronators & supinators 2. List those muscles in Q1 which also act on the GHJ and state their actions on shoulder joint Elbow Flexors BB – flexion of GHJ BR B PT CFO – medial epicondyle & radius Bold = at two joints

Elbow Extensors A T – extension of GHJ S CEO – lateral epicondyle & posterior wrist bones

Forearm pronators PT PQ BR – inserts at distal RUJ

Forearm supinators S BB BR

Objective 16.3 3. List those muscles in Q1 which dynamically stabilise the elbow against centripetal force when you do rapid alternating movements 4. State the recruitment of elbow flexors when you flex the arm from 0o to 90o flexion against little resistance with the shoulder at 0o & the forearm in neutral pronation & supination Note: neutral = midway between full pronation & full supination Biceps eccentrically/triceps concentrically Biceps concentrically/triceps eccentrically 5. State the recruitment of elbow flexors when you flex the arm from 0o to 90o flexion against large resistance with the shoulder at 0o & the forearm in neutral pronation & supination Brachialis, brachioradialis, biceps, (PT, CFO if very weak) Fights supinators and extensors to keep the hand neutral 6. Explain any likely change in recruitment of elbow flexors in Q4 & Q5 if you flex the elbow with the forearm in (i) Full pronation Does not recruit supinators (ii) Full supination Does not recruit pronators 7. Explain the reason brachioradialis is considered to be the preferred dynamic stabiliser of the elbow during a rapid elbow flexion and extension e.g. when hammering nail into wall The brachioradialis is a very strong shunt muscle Objective 16.4 8. Analyse the muscle recruitment pattern during full elbow flexion at 90o of shoulder abduction i.e. during a biceps curl when shoulder is also laterally rotated Does not recruit biceps if only elbow flexion 9. Analyse the muscle recruitment pattern during a triceps extension exercise (with the shoulder extended 45o and medially rotated)...