2.4 Neurological Interventions
Key Takeaways
Neuroplasticity—the nervous system's capacity to reorganize—is the basis of all neurological rehabilitation
Task-oriented (task-specific) training is the most evidence-based approach for motor recovery after stroke
PNF techniques for neuro patients include rhythmic initiation, slow reversals, rhythmic stabilization, and hold-relax
The NDT/Bobath approach inhibits abnormal tone and facilitates normal movement through handling and key points of control
Constraint-induced movement therapy restrains the less-affected arm and requires residual hand function (~20 deg wrist and 10 deg finger extension)
Body-weight-supported treadmill training enables repetitive stepping and engages spinal central pattern generators
Balance training progresses static to dynamic, wide to narrow base, stable to unstable surface, and eyes open to closed
External cueing—visual (floor lines, laser) and auditory (metronome)—overcomes freezing of gait in Parkinson disease
Neurological interventions are grounded in neuroplasticity—the nervous system's ability to reorganize and form new connections in response to experience, practice, and injury. The NPTE tests the evidence-based principles and approaches that drive recovery.
Principles of Neuroplasticity
| Principle | Meaning | Application |
|---|---|---|
| Use it or lose it | Unused circuits degrade | Prevent learned non-use of the affected limb |
| Use it and improve it | Training drives specific change | Repetitive, progressive functional practice |
| Specificity | Train the desired outcome directly | Practice the actual task you want to improve |
| Repetition | Adaptation needs volume | Hundreds of reps per session |
| Intensity | Sufficient challenge is required | Push to an appropriate difficulty |
| Salience | Meaning matters | Use patient-centered, real-world goals |
| Time | Plasticity is time-sensitive | Start early; recovery continues for months/years |
| Transference | Skills generalize | Practice across contexts and environments |
These principles explain why massed, meaningful, repetitive task practice outperforms isolated exercise.
Treatment Approaches
Task-Oriented Training (gold standard)
Task-oriented training is the most evidence-based approach for motor recovery after stroke. It practices real-world functional tasks (reaching, grasping, sit-to-stand, walking), broken into parts or trained whole, at high repetition (100-300+ reps/session) with progressively harder environmental demands. Research consistently favors task-specific practice over impairment-based exercise alone.
PNF for Neurological Patients
| Technique | Description | Purpose |
|---|---|---|
| Rhythmic initiation | Passive -> active-assistive -> active through a pattern | Help initiate movement (good for Parkinson) |
| Slow reversals | Alternating isotonic agonist/antagonist contractions | Build active movement and endurance |
| Rhythmic stabilization | Alternating isometric contractions, no motion | Improve stability and co-contraction |
| Hold-relax | Isometric contraction, relax, then stretch | Increase ROM, reduce spasticity |
NDT / Bobath
The Neurodevelopmental Treatment (Bobath) approach inhibits abnormal tone and primitive reflexes while facilitating normal movement through skilled handling at key points of control (pelvis, shoulder girdle, proximal joints), emphasizing postural control as the foundation for movement. Evidence comparing NDT to task-oriented training is mixed.
Constraint-Induced Movement Therapy (CIMT)
CIMT targets upper-extremity recovery after stroke: the less-affected arm is restrained (mitt/sling) for up to ~90% of waking hours while the hemiparetic arm undergoes intensive massed practice (classically 6 hours/day for two weeks; modified protocols use ~3 hours/day). Candidacy requires residual motor function—about 20 degrees of active wrist extension and 10 degrees of finger extension. Evidence is strong for improving function in chronic stroke by reversing learned non-use.
Gait Training and Cueing
Body-Weight-Supported Treadmill Training (BWSTT)
The patient is suspended in a harness over a treadmill with 20-40% body-weight support, allowing repetitive stepping before full weight-bearing is possible. BWSTT engages spinal central pattern generators and improves gait speed and endurance after stroke and incomplete SCI.
Cueing for Parkinson Disease
| Cue | Examples | Purpose |
|---|---|---|
| Visual | Floor lines/tape, laser on a walker, stepping over targets | Break freezing, lengthen stride |
| Auditory | Metronome, rhythmic music, counting | Regulate cadence |
| Tactile | Tap the hip/shoulder | Initiate movement |
| Cognitive | Count steps, focus on heel strike | Bypass the basal ganglia via cortical control |
Balance Training Progression
Balance retraining advances along several dimensions at once, increasing the challenge only as the patient succeeds safely:
- Static -> dynamic (holding a posture, then moving within it)
- Wide base -> narrow base -> tandem -> single-leg stance
- Stable surface -> unstable surface (foam, wobble board)
- Eyes open -> eyes closed (removing visual compensation to load the somatosensory and vestibular systems)
- No dual task -> dual task (adding a cognitive or motor distraction)
- Predictable -> unpredictable perturbations (anticipatory, then reactive control)
Match the progression to the patient's deficit: a patient who fails only with eyes closed has a proprioceptive deficit and benefits from eyes-closed and unstable-surface work, while a patient with reactive-balance loss needs perturbation training.
Motor Learning and Feedback
Neurological interventions also test motor-learning principles, which shape how you structure practice and feedback. Practice schedule matters: blocked practice (repeating one task) speeds early acquisition, but random/variable practice (interleaving tasks) produces better long-term retention and transfer—so progress patients toward variable practice as they stabilize. Whole versus part practice depends on task complexity: highly integrated tasks like gait are often best practiced whole, while complex, separable tasks can be trained in parts then combined.
Feedback should fade as learning consolidates. Early on, more frequent knowledge of performance (about movement quality) and knowledge of results (about the outcome) guide the learner; as skill develops, reducing feedback frequency and using summary or faded schedules forces the patient to self-detect errors, which improves retention. An external focus of attention (on the movement's effect in the environment, such as a target) generally outperforms an internal focus (on body parts) for motor performance.
These principles explain why simply doing many repetitions is not enough—the structure of practice and feedback determines how well a skill is retained and generalized.
A patient is 3 months post-stroke with 20 deg wrist extension and 10 deg finger extension. Which intervention has the STRONGEST evidence for improving UE function?
Passive range of motion only
Constraint-induced movement therapy (CIMT)
Resting the affected arm in a sling
Ultrasound to the forearm
A Parkinson patient freezes when approaching doorways. The MOST effective PT strategy is:
Tell the patient to walk faster
Provide external cues such as floor lines or a metronome
Avoid all doorways permanently
Add ankle weights
Which neuroplasticity principle explains why practicing the actual functional task beats isolated exercise?
Use it or lose it
Specificity
Age
Time
Arrange these balance activities from LEAST to MOST challenging:
Arrange the items in the correct order
Tandem stance on firm floor, eyes open
Narrow-base standing, eyes open
Single-leg stance on foam, eyes closed
Wide-base standing, eyes open
Body-weight-supported treadmill training promotes gait recovery primarily by activating:
The vestibular ocular reflex
Spinal central pattern generators
The Golgi tendon organ reflex
Peripheral nerve regeneration
The minimum motor requirement to be a CIMT candidate is approximately:
No active movement required
About 20 deg wrist extension and 10 deg finger extension
Full hand function
Only intact sensation
The PNF technique of rhythmic stabilization is BEST used to improve:
Movement initiation
Joint stability and co-contraction
Cardiovascular endurance
Passive range of motion
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