WorksheetsNMES and Muscle Contraction Quiz
Total questions: 12
Worksheet time: 6mins
Which muscle fibers are recruited first during electrically induced muscle contractions (NMES)?
Type I (Slow-twitch)
Type IIa (Fast oxidative)
Type IIx (Fast-twitch)
Both Type I and Type II fibers simultaneously
When using NMES for muscle strengthening, what is the recommended target intensity?
10% of Maximum Voluntary Contraction (MVC)
30% of MVC
50% or higher of MVC
90% of MVC
Which of the following is a key difference between NMES-induced and voluntary muscle contractions?
Voluntary contractions activate fast-twitch fibers first.
NMES-induced contractions have a smooth onset.
NMES activates large fibers with low activation thresholds first.
Voluntary contractions recruit superficial muscle fibers first.
What is the primary purpose of using sensory-level electrical stimulation in edema management?
To induce muscle contraction for muscle pumping
To directly stimulate nerve regeneration
To decrease capillary permeability and fluid leakage
To activate motor units in deep muscles
Which of the following best describes the mechanism of sensory habituation in reducing spasticity?
Fatiguing the spastic muscle by continuous contractions
Reducing the sensitivity of the nervous system to repeated sensory input
Directly stimulating the spastic muscle to inhibit contraction
Strengthening the antagonist muscle to reduce spasticity
When applying NMES for muscle strengthening, which of the following pulse durations is typically used?
10-50 µsec
100-200 µsec
200-400 µsec
500-1000 µsec
For a denervated muscle, which type of current and pulse duration is generally recommended?
Biphasic current with 100 µsec pulse duration
Monophasic current with 1-450 msec pulse duration
Russian current with 50 Hz frequency
High-frequency biphasic current with 20 msec pulse duration
Which mechanism is involved when NMES is used on the antagonist muscle to reduce spasticity in the spastic agonist muscle?
Sensory habituation
Reciprocal inhibition
Direct muscle fatigue
Renshaw cell activation
What is a recommended frequency for muscle strengthening using NMES?
1-10 Hz
20-50 Hz
80-100 Hz
120 Hz
Which of the following is a common precaution when using EMS on denervated muscles?
Using high-frequency currents to ensure deep muscle activation
Avoiding the use of long pulse durations
Monitoring the skin closely to prevent burns due to higher currents
Always starting with the highest amplitude for quicker results
In edema control, which method is most suitable for initiating treatment immediately after injury (within 6 hours)?
Muscle pumping with motor-level stimulation
Sensory-level stimulation with negative electrodes over the injured area
High-intensity NMES to the affected limb
Alternating current for deep muscle contraction
Which parameter is NOT typically adjusted when using NMES for muscle strengthening?
Pulse duration
Frequency
Ramp-up time
Current polarity
