NPTE-PT Neuromuscular System Interventions 5 — Questions and Answers
Question 1: When applying the PNF technique of approximation at the shoulder, what is the PRIMARY physiological mechanism?
- Golgi tendon organ inhibition to allow greater ROM
- Joint compression stimulating mechanoreceptors to facilitate co-contraction and postural stability (Correct answer)
- Muscle spindle stretch reflex activation through quick lengthening
- Joint distraction to reduce pain and allow relaxation
Correct answer: Joint compression stimulating mechanoreceptors to facilitate co-contraction and postural stability
Approximation compresses joint surfaces, stimulating articular mechanoreceptors and muscle spindles, which reflexively facilitates simultaneous contraction of muscles surrounding the joint for stability.
Question 2: A patient recovering from Guillain-Barré syndrome (GBS) is in the recovery phase. Which exercise parameter is MOST critical to monitor?
- Heart rate variability during aerobic exercise
- Signs of overwork weakness including increased fatigue and declining function (Correct answer)
- Blood pressure response to positional changes
- Passive muscle flexibility and neural tension
Correct answer: Signs of overwork weakness including increased fatigue and declining function
Overwork weakness in GBS occurs when denervated or partially reinnervated muscles are exercised beyond their capacity, causing a lasting decline in strength that may not fully recover.
Question 3: Task-oriented gait training for stroke survivors should PRIMARILY emphasize which characteristic to maximize neuroplastic benefit?
- High repetitions of the complete walking task practiced in variable real-world contexts (Correct answer)
- Isolated strengthening of individual lower extremity muscle groups before walking
- Passive ambulation with maximal body weight support throughout recovery
- Stretching spastic muscles for 30 minutes before each gait session
Correct answer: High repetitions of the complete walking task practiced in variable real-world contexts
Neuroplasticity is driven by high-dose, task-specific, variable practice of the actual walking task; specificity of training and volume of practice are the primary drivers of cortical reorganization.
Question 4: Which intervention is CONTRAINDICATED for a patient in the acute inflammatory phase of polymyositis?
- Gentle passive and active-assistive range of motion
- High-intensity progressive resistive exercise (Correct answer)
- Aquatic therapy at thermoneutral water temperature
- Diaphragmatic breathing and trunk mobility exercises
Correct answer: High-intensity progressive resistive exercise
High-intensity exercise during active myositis inflammation can increase muscle enzyme levels, worsen inflammation, and cause further muscle damage; only gentle ROM is appropriate in the acute phase.
Question 5: When using aquatic therapy for neuromuscular re-education, which property of water is MOST therapeutically beneficial for enabling movement practice that is not possible on land?
- Hydrostatic pressure reducing peripheral edema
- Turbulence providing variable proprioceptive challenges to balance
- Buoyancy reducing effective body weight to allow movement with weak muscles (Correct answer)
- Water viscosity providing resistance to strengthen muscles
Correct answer: Buoyancy reducing effective body weight to allow movement with weak muscles
Buoyancy reduces the load of gravity on the body, allowing patients with significant neuromuscular weakness to practice active movement and gait patterns that they cannot yet perform on land.
Question 6: Functional electrical stimulation (FES) for foot drop post-stroke should be timed to deliver stimulation during which phase of the gait cycle?
- Midstance, to stabilize the ankle during weight-bearing
- Swing phase, to facilitate ankle dorsiflexion and toe clearance (Correct answer)
- Terminal stance, to assist with push-off force generation
- Continuously throughout the entire gait cycle for maximum effect
Correct answer: Swing phase, to facilitate ankle dorsiflexion and toe clearance
FES for foot drop is triggered at initial swing and delivered throughout the swing phase to produce dorsiflexion and eversion, clearing the foot from the ground during ambulation.
Question 7: Which principle of neuroplasticity MOST directly supports the use of high-repetition, task-specific training in neurorehabilitation?
- Synaptic pruning eliminates underused circuits and requires passive stimulation to counteract
- Use-dependent plasticity — repeated activation of neural circuits strengthens synaptic connections through LTP (Correct answer)
- Neuroplasticity is limited to the first 6 months post-injury and cannot be driven later
- Compensatory strategies using the intact hemisphere prevent ipsilateral plasticity
Correct answer: Use-dependent plasticity — repeated activation of neural circuits strengthens synaptic connections through LTP
Use-dependent plasticity (driven by long-term potentiation) shows that repeated co-activation of neural pathways strengthens synaptic efficacy — the neuroscientific basis for repetitive task practice.
NPTE-PT Neuromuscular System Interventions 5
When applying the PNF technique of approximation at the shoulder, what is the PRIMARY physiological mechanism?