Ch. 5, E-Stim, Pt.2

What does this figure represent?

Answer explanation

These are visual examples of various waveforms/currents.

What parameter values control the type of muscle contraction?

• pulse duration

• frequency

• intensity

• on/off time

Answer explanation

Higher F should produce an increase in muscle tension due to the summative effects, while lower F is more often used for muscle pumping & edema reduction.

What would happen if the electrode pads were spread apart farther?

• Current density will increase into deeper tissues

• Current density will increase into superficial tissues

• Current density will lessen overall

• Current density will spread past the electrodes

Answer explanation

If the electrodes are spaced farther apart, the current density will be higher in the deeper tissues, including nerve and muscle.

Is the normal polarity running along the outside of the nerve fiber (+)?

Answer explanation

To cause the nerve to depolarize the polarity needs to be reversed.

What does figure illustrate?

• Needed intensity / frequency values to solicit nerve fibers

• Values necessary to cause a nerve fiber to depolarize

• Parameter values to decrease swelling

• Necessary stimuli to overcome the 1st to 2nd neurons

Answer explanation

Chronaxie needs to be met using the strength-duration curve.