Analysis of upper limb activities

Question 1

movements involved in the upward motion of a press up

Answer 1

elbow extension
shoulder flexion
shoulder girdle protraction

Question 2

muscles involved in the upward motion of a press up

Answer 2

elbow extension - triceps, anconeus
shoulder flexion - pec major, anterior deltoid, assisted: coracobrachialis, long head biceps
protraction - serratus anterior, pec minor concentric

Question 3

movements involved in the downward motion of press up

Answer 3

elbow flexion
shoulder extension
shoulder girdle retraction

Question 4

the type of muscle contraction downward

Answer 4

eccentric activity

Question 5

abduction initiated by

Answer 5

concentric activity of supraspinatus 10-15

deltoid takes over afterwards

Question 6

what stabilises the abduction

Answer 6

rotator cuff muscles - isometrically

Question 7

when does rotation of scapula occur during abduction

Answer 7

30 degrees abduction

by upper and lower half trapezius and lower half of serratus anterior

Question 8

when does lateral rotation of humerus occur during abduction and why

Answer 8

90 degrees abduction

to prevent it coming in contact w/ coracoacromial arch

Question 9

muscles involved in lateral rotation of humerus during abduction

Answer 9

teres minor and infraspinatus - concentrically

Question 10

starting position of using a screwdriver

Answer 10

shoulder girdle - protracted, joint flexed
elbow - flexed
metacarpals, proximal phalanges, distal phalanges - flexed
thumb - adducted and flexed

Question 11

muscles involved in screwdriver motion on right hand dominant movements

Answer 11

biceps brachii, supinator and brachioradialis concentrically

Question 12

muscles involved in screwdriver motion on left hand dominant movements

Answer 12

Pronator teres and quadratus and brachioradialis concentrically

Question 13

common muscles in screwdriver motion

Answer 13

Fingers flexed by FDS, FDP & lumbricals
Thumb flex / add – FPL, thenar muscles, Add poll
Wrist synergistic action of ECRL, ECRB, ECU

Question 14

importance of wrist and hand function in screwdriver motion

Answer 14

provide stable base of hand

wrist extensor making a fist

Question 15

name wrist extensors

Answer 15

extensor carpi radialis brevis (ECRB)
Extensor carpi radialis longus (ECRL)
Extensor carpi ulnaris (ECU)

Question 16

Importance of the activation of wrist extensors for the screwdriver motion

Answer 16

block wrist flexion tendency caused by activating finger flexors
maintain optimal length of finger flexors