Flashcard Set Preview
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| 1 |
EMG
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surface, intramuscular (needle/wire)
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| 2 |
shows the electrical activity associated with muscle contraction
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EMG
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| 3 |
pick up depolarizing wave
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EMG
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| 4 |
get's more positive closer to the electrode and more negative further away from the electrode...
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EMG
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uses a bipolar recording
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EMG
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why does EMG use a bipolar recording
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eliminate electrical noise
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| 7 |
signal processing (3)
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raw, full-wave rectified, smooth
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| 8 |
takes negatives and makes them positive
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full-wave rectified
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| 9 |
not a direct representation of force
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EMG
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| 10 |
____ activated before ____ (electrical event leads mechanical event)
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EMG, force
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| 11 |
will get signlas from adjacent muscles (contamination). Cannot issolate only one muscles...
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crosstalk
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| 12 |
_____ varys from day to day walking
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EMG
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| 13 |
normalizing - divide EMG signals by a 'standard' EMG value obtained during (3)
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submax isometric contraction, max isometric contraction, average peak EMG during walking
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| 14 |
things other than muscle that affect signal size (3)
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size of muscle, skin imedance, subcutaneous fat
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| 15 |
mechanical tasks in stance phase (2)
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prevent collapse, propulsion
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mechnical task in swing phase
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ground clearance
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| 17 |
ex. of sagittal plane stance phase
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weight support
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| 18 |
ex of frontal plane stance phase
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hip drop
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| 19 |
linkage behaviour, move leg forwards, clear the ground
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ground clearance
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| 20 |
hip is ___ in stance phase
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adducted
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| 21 |
hip is _____ in swing phase
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abducted
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| 22 |
helps prevent collapse in the sagittal plane, active in mid stance and heel contact
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glute max
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| 23 |
prevents collapse in the frontal plane, lengthening contraction in stance, shortening contraction...
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glute med
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| 24 |
knee is most flexed in
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early swing
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| 25 |
slow swinging leg at end of swing phase, stabilize knee in early stance
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medial hamstrings
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| 26 |
prevents collapse in stance, peaks shortly after foot contact, not needed in extension of knee...
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vastus lateralis
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| 27 |
co-contraction of ____ and ___ in early stance to stabilize knee
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medial hamstrings and vastus lateralis
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| 28 |
lost of muscles are active around
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heel contact
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| 29 |
for the majority of the stanc ephase the ankle is in
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DF
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| 30 |
lowers foot in early stance, ground clearance in swing
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tib ant
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| 31 |
prevents collapse in early swing, controls forward rotation of body, push-off in late stance...
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soleus
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| 32 |
erector spinae stabilize trunk at each
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heel contact
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| 33 |
muscles active in early stance
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DF, hamstrings, quads, hip extensors
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| 34 |
muscles active in mid stance
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PF, quads
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| 35 |
muscles active in late stance
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PF, hip flexors
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| 36 |
muscles active in early swing
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DF, hip flexors
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| 37 |
muscles active in mid swing
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DF
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| 38 |
muscles active in late swing
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DF, hamstrings, quads
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