Ch. 15 Biofeedback

Question 1

____ is the time from a command to stop a muscle contraction to the point when the myoelectrical activity returns to resting or baseline levels.

A. Peak amplitude
B. Contraction latency
C. Return latency
D. Hold capacity

Answer 1

C. Return latency

Question 2

All of the following statements about bio feedback are true EXCEPT:

A. It’s benefits are based on the patient learning to change their physiological processes using clinical output data
B. More than one session is often required
C. It is not recommended that adjunctive techniques be used concurrently
D. It’s use is growing as it becomes more widely excepted and affordable

Answer 2

C. It is not recommended that adjunctive techniques be used concurrently

Question 3

EMG biofeedback works to treat headaches and ease tension migraines by decreasing muscle tension in which muscle(s)?

A. Pericranial 
B. Frontalis 
C. Upper trapezius
D. Both A and C
E. All of the above

Answer 3

E. All of the above

Question 4

EMG biofeedback to facilitate muscle contractions is generally contraindicated within the first __ weeks following surgery.

A. 2
B. 4
C. 6
D. 8

Answer 4

C. 6

Question 5

In the 2014 clinical practice guidelines, the American College of physicians recommended EMG as a first line intervention for the management of:

A. Fractured wrist
B. Stress urinary incontinence
C. Stroke
D. Pressure ulcer

Answer 5

B. Stress urinary incontinence

Question 6

How does biofeedback differ from other physical modalities?

A. It does not rely on an exchange of energy to produce a physiological effect
B. It does not cost as much
C. It can be applied without a physician present
D. It may require several treatments before results are documented

Answer 6

A. It is not rely on an exchange of energy to produce a physiological effect

Question 7

When used to encourage a muscle contraction, the EMG signal threshold should be set :

Answer 7

At or above the predetermined maximum volitional EMG amplitude

Question 8

Potential adverse effects of EMG biofeedback to facilitate muscle contractions include which of the following:
A. Dyspnea 
B. Fatigue
C. DOMS
D. All of the above

Answer 8

D. All of the above

Question 9

Surface EMG electrodes generally consist of:
A. 2 chloride electrodes
B. 2 silver electrodes
C. 3 silver-silver chloride electrodes
D. None

Answer 9

C. 3 silver-silver chloride electrodes

Ag-AgCl

Question 10

Which of the following can be used to provide direct biofeedback?

A. HR monitor
B. BP pressure reader
C. Superficial EMG
D. A & B

Answer 10

D. A & B

Question 11

How long should you wait following an injury before beginning EMG biofeedback to facilitate muscle contraction?

A.24 hrs
B.48 hrs
C.72 hrs
D. 3 weeks

Answer 11

C. 72 hrs

After 72 as long as inflammation is controlled

Question 12

EMG biofeedback has been clinically proven to be an effective intervention for addressing impairments in patients with:

A. Hemiplegia
B. Depression
C. Arthritis
D. Headache
E. A & D

Answer 12

E. A & D

Question 13

What is the general guideline of amplitude for EMG, muscle at rest vs. healthy muscle contractions?

Answer 13

Amplitude ~ 2 microvolts for muscle at rest

Healthy muscle contractions ~25 microvolts
20-30

Question 14

Settings on an EMG biofeedback device typically range from _-___ microvolts

Answer 14

1-2000

Question 15

Gain setting determines device’s _____ or ability to reflect ionic activity.

Higher gain setting= small changes in electrical activity produce EMG signal

Answer 15

Sensitivity

Question 16

Def. - Highest EMG activity during muscle contraction

Answer 16

Peak amplitude

Question 17

Def.- Time it takes to reach peak amplitude

Answer 17

Contraction latency

Question 18

Def. - From peak amplitude to resting or baseline level

Answer 18

Return latency

Question 19

Def.- Time during consistent EMG amplitude

Answer 19

Hold capacity

Question 20

Def. - Goal level of activity set by clinician

Answer 20

Threshold