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Strength-Duration Curves in Physiotherapy

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Strength-Duration Curves in Physiotherapy

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Questions and Answers

In the strength-duration (S-D) curves, what happens to the external electrical stimulus as the pulse duration decreases?

The external electrical stimulus needs less intensity to produce the same stimulus

The external electrical stimulus needs more intensity to produce the same stimulus (correct)

The external electrical stimulus becomes ineffective

The external electrical stimulus is not affected by the pulse duration

What is the main aim of using the strength-duration (S-D) curves?

Strengthen the sensory nerves

Induce pain sensation in nerves

Reduce muscle contraction

Maintain the functional state of the neuromuscular system (correct)

In electrode placement for monopolar stimulation, where should the cathode be placed?

Distal

Over muscle motor point or nerve motor point (correct)

Proximal

Neutral, over the plexus

Which type of S-D curve shape requires more intensity with short pulse duration?

<p>Rectangular shape</p> Signup and view all the answers

What happens to the external electrical stimulus in muscles without nerve injury as the pulse duration increases?

<p>Less intensity needed</p> Signup and view all the answers

Study Notes

Strength-Duration (S-D) Curves

As the pulse duration decreases, the external electrical stimulus increases in intensity.
The main aim of using the strength-duration (S-D) curves is to determine the minimum amount of current required to stimulate a muscle at different pulse durations.

Electrode Placement for Monopolar Stimulation

The cathode should be placed close to the motor point of the muscle for monopolar stimulation.

S-D Curve Shapes

The sigmoidal S-D curve shape requires more intensity with short pulse duration.

Muscles without Nerve Injury

As the pulse duration increases in muscles without nerve injury, the external electrical stimulus decreases in intensity.

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Description

Learn about strength-duration (S-D) curves and their application in physiotherapy. This quiz covers electrode placement, parameters, and examples related to S-D curves, illustrating the relationship between current amplitude and pulse duration to produce a threshold stimulus.