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CALU - Kinesiology > Gait Quiz > Flashcards

Gait Quiz Flashcards

1
Q

What is gait?

A

Manner of walking

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2
Q

What is the gait cycle?

A

Cyclic pattern of engagement of muscles and joints when walking

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3
Q

When does a mature gait pattern appear?

A

Age 7

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4
Q

When does gait cycle start and end?

A

Start: one heel strikes the ground
Ends: same heel strikes ground

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5
Q

What is stride?

A

one cycle of the gait cycle (a left step and a right step)

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6
Q

When does step begin and end?

A

Begin: When heel of other foot strikes ground
Ends: When its own heel strikes the ground

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7
Q

When does stance phase begin and end?

A

Begin: at heel-strike
Ends: at toe-off

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8
Q

When does swing phase begin and end?

A

Begin: at toe-off
Ends: at heel-strike

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9
Q

What is step length?

A

Length between 2 consecutive heel strikes (length of a step)

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10
Q

Average step length of an adult?

A

28 inches (72 cm)

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11
Q

What is step width?

A

Width between the centers of 2 consecutive heel strikes

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12
Q

Average step width of an adult?

A

3 inches (7-9 cm)

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13
Q

What is step angulation?

A

Angle created between the direction in which one is moving and the long axis of the foot

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14
Q

What is a normal step angulation?

A

~7-10 deg

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15
Q

What is the normal pace of walking?

A

~100 steps/min (2.5 mph [4 kph])

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16
Q

Each foot strikes the ground how many times per day?

A

2000-10,000

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17
Q

Each foot strikes the ground how many times per day?

A

2000-10,000

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18
Q

Stance phase (5)

A
  1. Heel-strike
  2. Foot-flat
  3. Midstance
  4. Heel-off
  5. Toe-off
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19
Q

Why do you want the foot to be open-packed (pronation/eversion) in the early stages of stance?

A

So it can adapt to the uneven surface of the ground; pronation allows arches to collapse

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20
Q

Why do you want the foot to be close-packed (supination/inversion) in the late stages of stance?

A

Foot must be stiff and stable to propel the body forward; supination holds the arches high and creates a more rigid foot

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21
Q

What gives the foot the ability to change from being supple (pronate) to rigid (supination)

A

Laxity/tautness of plantar fascia (windlass mechanism)

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22
Q

What is the windlass mechanism?

A

Creates the ability of plantar fascia to become lax or taut; when extension occurs at MTP joints, fascia is pulled taut around these joints and tension is transferred to the arches, causing them to rise

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23
Q

What is the windlass mechanism?

A

Creates the ability of plantar fascia to become lax or taut; when extension occurs at MTP joints, fascia is pulled taut around these joints and tension is transferred to the arches, causing them to rise

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24
Q

Heel-strike is the landmark that begins _____ and ends ____

A

begins stance phase

ends swing phase

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25
What is foot-flat?
When entire plantar surface is in contact with ground
26
What is midstance?
When weight of body is directly over lower extremity (greater trochanter above middle of foot)
27
What is midstance?
When weight of body is directly over lower extremity (greater trochanter above middle of foot)
28
Toe-off is the landmark that ends _____ and begins _____
ends stance phase | begins swing phase
29
Swing phase begins with ____ and ends with ____
begins with toe-off | ends with heel-strike
30
Swing phase (3)
1. Early swing 2. Mid-swing 3. Late swing
31
Stance phase and swing phase make up how much of the gait cycle (%)
Stance: 60% Swing: 40%
32
What is double-limb support?
When both feet are in contact with the ground
33
What is double-limb support?
When both feet are in contact with the ground
34
What distinguishes walking from running?
The presence of double-limb support
35
Lower extremity contractions during gait cycle (3)
1. Concentric contraction to create motion 2. Eccentric contraction to decelerate momentum 3. Isometric contraction to stabilize & prevent motion
36
During the early to middle stages of the stance phase, muscles are primarily ____ contracting
eccentrically
37
During the middle to late stages of the stance phase, muscles are primarily ____ contracting
concentrically
38
During the middle to late stages of the stance phase, muscles are primarily ____ contracting
concentrically
39
How does electromyography determine when a muscle is contracting?
Depolarization of the muscle's membrane (contraction) generates electricity
40
What are the 2 roles of the hip flexors?
1. Contract concentrically to create forward swing | 2. Contract eccentrically to decelerate hip extension before toe-off
41
Why does the hip flexor only need to concentrically contract during 1st half of swing phase?
2nd half is completed by momentum (ballistic motion)
42
What are major hip joint flexors?
Iliopsoas, sartorius, rectus femoris
43
What are major hip joint flexors?
Iliopsoas, sartorius, rectus femoris
44
What are the 2 roles of the hip extensors?
1. Contract eccentrically to decelerate forward-swinging limb in late swing 2. Contract isometrically with force on heel-strike to stabilize pelvis from anterior tilt
45
What are major hip extensors?
hamstrings, glute max
46
What are major hip extensors?
hamstrings, glute max
47
Are hip joint abductors more important with regard to action on the pelvis or the thigh?
Pelvis
48
Major function of hip abductors?
Create force of depression on same-side pelvis during stance phase, especially heel-strike to midstance
49
Why is it important for the abductors to place a depression force on the pelvis during stance?
So the swing side doesn't depress and fall toward the
50
Why is it important for the abductors to place a depression force on the pelvis during stance?
Stop pelvis from depressing to the swing-limb side
51
Major hip abductors?
Glute medius, minimus Also TFL, sartorius, and upper glutes
52
Depression of the pelvis at the hip joint is the reverse of
abduction of thigh at the hip joint
53
What kind of contraction are the abductors performing
Slightly eccentric
54
What kind of contraction are the abductors performing
Slightly eccentric because pelvis is permitted to drop slightly toward the swing side
55
What kind of contraction are the abductors performing
Slightly eccentric because pelvis is permitted to drop slightly toward the swing side
56
2 roles of hip adductors?
1. Contract at heel-strike - aids extensors' stabilization of hip as foot hits the ground 2. Contract just after toe-off - aids flexion of thigh
57
Adductors can ____ the thigh when it is _____ and vice versa
Extend the thigh when it is flexed
58
Major adductors
adductor longus, brevis, and magnus; pectineus; gracilis
59
Major adductors
adductor longus, brevis, and magnus; pectineus; gracilis
60
When are lateral rotators primarily active?
During stance phase - control the medial rotators' action on the pelvis (controls ipsilateral rotation of the pelvis of the medial rotator muscles) Prevent excessive medial rotation of the thigh at the hip
61
When are lateral rotators primarily active?
During stance phase - control the medial rotators' action on the pelvis (controls ipsilateral rotation of the pelvis of the medial rotator muscles) Prevent excessive medial rotation of the thigh at the hip
62
What can cause excessive medial rotation of the thigh during stance?
Excessive pronation at the subtalar joint (calcaneus fixed and talus medially rotates and carries leg/thigh with it)
63
What can cause excessive medial rotation of the thigh during stance?
Excessive pronation at the subtalar joint (calcaneus fixed and talus medially rotates and carries leg/thigh with it)
64
What reverse action is important during planting and cutting in sports?
Contralateral rotation of the pelvis at the hip joint by the lateral rotators.
65
Lateral rotation of the thigh at the hip joint is the reverse action of
contralateral rotation of the pelvis at the hip joint
66
Major hip joint lateral rotators
Glute max, posterior med/min, deep lateral rotators of thigh (piriformis, gemelli, obturator internus, externus, quadratus femoris)
67
Major hip joint lateral rotators
Glute max, posterior med/min, deep lateral rotators of thigh (piriformis, gemelli, obturator internus, externus, quadratus femoris)
68
2 roles of knee extensors?
1. Contract concentrically at end of swing to extend at knee and reach out with leg in prep for heel strike 2. Eccentrically contract and decelerate knee flexion early stance and then concentric to create extension near midstance
69
Major knee extensors
Quad femoris
70
Major knee extensors
Quad femoris
71
3 roles of knee flexors
1. Contract eccentrically to declerate extension just before heel-strike 2. Contract just after heel-strike to stabilize knee in early stance 3. Contract during swing to keep foot from dragging on the ground
72
Major knee flexors?
hamstrings, gastroc
73
Major knee flexors?
hamstrings, gastroc
74
2 roles of ankle dorsiflexors?
1. Eccentric to decelerate plantarflexion during early stance - allows foot to be lowered to ground in controlled manner
75
2 roles of ankle dorsiflexors?
1. Eccentric to decelerate plantarflexion during early stance - allows foot to be lowered to ground in controlled manner 2. Concentric during swing phase to keep toes off the ground
76
Foot slap
When foot not brought to the ground in a controlled and graceful manner.
77
Foot slap
When foot not brought to the ground in a controlled and graceful manner. Caused by nerve compression of deep fibular nerve that innervates anterior leg
78
Major ankle dorsiflexors
Tibialis anterior, EDL, EHL, fib tertius
79
Major ankle dorsiflexors
Tibialis anterior, EDL, EHL, fib tertius
80
2 roles of ankle plantarflexors
1. Eccentric in stance to decelerate dorsiflexion | 2. Concentric at toe-off
81
What would happen without plantarflexion force as leg moves anteriorly toward foot?
Leg would collapse at ankle
82
Major ankle plantarflexors
Gastrocnemius, soleus
83
2 roles of subtalar supinators
1. Eccentric from heel-strike to foot flat to decelerate pronation 2. Concentric from foot-flat to toe-off
84
Pronation from heel-strike to foot flat is a passive/active process
Passive - caused by body weight moving over teh arch of the foot
85
Major subtalar supinators
tibialis posterior, tibialis anterior, FDL, FHL, intrinsics
86
Major subtalar supinators
tibialis posterior, tibialis anterior, FDL, FHL, intrinsics
87
Person with excessively pronated foot will often overwork the___
foot supinators - trying to countery tendency to overly pronate when weight bearing
88
Result of excessive pronation?
pain in supinator muscles, especially TP and TA (shin splints)
89
Excessive pronation is a collapse of which arch?
medial longitudinal
90
Intrinsic foot muscles support the arches and also
supinators to prevent excessive pronation
91
Why do the intrinsic muscles of the foot weaken with shoes?
Need to contract and supinate to prevent pronation is lost; can exacerbate excessive pronation
92
When are subtalar pronators active?
Later stance phase from foot flat to toe off; co-contract with supinators to help stabilize the foot and make it more rigid
93
Major subtalar pronators?
Fib longus and brevis

CALU - Kinesiology (8 decks)

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