10.2 Multiple Sclerosis and Demyelinating Disorders

Quick Answer: In MS, dose exercise around fatigue and heat, escalate new lasting neurological change as possible relapse, and build participation with pacing and equipment. Temporary heat-related worsening is not automatically permanent progression—but true new deficits need timely medical review, not “push harder.”

Multiple sclerosis (MS) is a chronic immune-mediated disease of the central nervous system causing demyelination and axonal injury. Presentations are heterogeneous: one person may have mild sensory symptoms and full community mobility; another may have marked spastic paraparesis, ataxia, visual impairment, and profound fatigue. APC Written items test whether you can reason from the presentation in front of you, manage fatigue and heat, recognise relapse-like change, and prescribe exercise and balance work without unsafe extremes.

Phenotypes: Useful Map, Not a Rigid Script

Know the classic phenotype language so stems make sense:

Critical exam rule: phenotype does not dictate a single exercise protocol. Two people with “RRMS” can need completely different plans. Use phenotype mainly to interpret time course language in the stem (sudden new deficit vs gradual change vs long-standing residual).

Related demyelinating contexts (e.g., neuromyelitis optica spectrum disorder mentioned in a stem) still push you toward impairment-based physiotherapy plus urgent medical pathways for acute neurological change—do not invent disease-specific drug regimens.

Core Impairment Clusters You Will See

MS can affect nearly any CNS pathway. Common physiotherapy-relevant clusters:

• Motor weakness and reduced endurance
• Spasticity (velocity-dependent increase in tone) with spasms, clonus, pain, hygiene challenges
• Sensory loss and neuropathic pain
• Cerebellar and sensory ataxia with dysmetria and balance loss
• Visual impairment (optic neuritis history, diplopia) affecting gait safety
• Bladder/bowel dysfunction affecting participation and falls risk when rushing
• Cognitive-fatigue interaction (slowed processing, attention limits)
• Depression and mood influencing activity
• Fatigue as a dominant activity limiter even when formal strength looks “okay”

Always screen falls history, home setup, work/study demands, heat triggers, and what a “good day vs bad day” looks like.

Fatigue Management: Not Optional Soft Skill

MS fatigue is often disproportionate to the activity performed. It may be primary (disease-related) and/or secondary (sleep, deconditioning, mood, infection, medication, heat).

Practical fatigue strategy toolkit

1. Activity diary light-touch: identify peaks, troughs, and high-value tasks.
2. Energy conservation: plan, prioritise, pace; sit for tasks when appropriate; break heavy days.
3. Work–rest cycling within sessions and days; avoid all-or-nothing boom-bust.
4. Sleep and routine advice at education level; escalate medical/sleep issues when severe.
5. Exercise dosing that improves capacity without multi-day payback crashes.
6. Cooling strategies if heat worsens fatigue (see below).
7. Interdisciplinary links (OT for pacing at work, psychology for mood, medical review for anaemia/thyroid/infection mimics when red flags appear).

Trap: telling every fatigued person to “just push harder for neuroplasticity.” Progressive activity is good; boom-bust overload that floors function for days is not a win.

Heat Sensitivity

Many people with MS experience temporary worsening of neurological symptoms with raised body temperature (exercise, hot weather, fever, hot showers)—often discussed in Uhthoff-type terms. Features may include increased weakness, blurred vision, sensory change, or cognitive fog that improves as cooling occurs.

Session and home adaptations

• Prefer cooler rooms, fans, breathable clothing, pre-cooling drinks as appropriate.
• Schedule outdoor mobility in cooler parts of the day in Australian summer contexts.
• Reduce intensity or duration when heat-related deterioration appears; do not interpret every temporary heat-related change as a new permanent lesion without context—but fever and true new lasting deficits still need medical thinking.
• Hydration and rest breaks are part of the prescription, not “soft extras.”
• Pool therapy may help some people (buoyancy + cooler water) if accessible and medically suitable; always consider transfer and fatigue after sessions.

Relapse vs Residual Deficit Reasoning

This distinction is high-yield for APC safety items.

Residual deficit

• Longstanding weakness, sensory loss, or ataxia after prior attacks
• Stable baseline known to the person/carers
• Therapy focuses on optimisation: strength, balance, aids, fitness, spasticity management within plan, participation

Possible relapse / acute inflammatory activity (reason to escalate)

• New neurological signs or clear worsening beyond usual day-to-day fluctuation
• Symptoms typically persist more than 24 hours (often days) in clinical definitions used in practice discussions
• Not explained only by heat, heavy exertion recovery, or known infection—though infection can also destabilise function and needs medical care
• Examples: new unilateral vision loss, new marked leg weakness, new bladder retention pattern, new dense sensory level symptoms, sudden major balance collapse atypical for the person

Physiotherapy action when relapse is suspected:

1. Stop aggressive new loading that could mask assessment or exhaust the person.
2. Keep the person safe (falls, skin, DVT risk if mobility plummets).
3. Urgent medical/neurology or GP pathway as appropriate to setting—do not wait weeks “to see if exercise fixes it.”
4. After medical management and stabilisation, resume rehab with reset baselines.

Pseudo-relapse / pseudoexacerbation awareness: infection, heat, and severe fatigue can temporarily worsen symptoms. Still treat medical causes; do not dismiss all worsening as “just heat” without assessment.

Balance, Spasticity, and Exercise Dosing

Balance

Ataxia, sensory loss, vestibular pathway involvement, weakness, and vision problems all degrade balance. Train:

• Static and dynamic balance with appropriate guarding
• Functional tasks (turns, dual surface, dual-task later)
• Gaze and sensory weighting strategies when relevant
• Assistive devices when falls risk outweighs unaided practice
• Home hazard reduction

Progress challenge only if quality and safety hold. Vestibular-style exercises may help selected people; they are not universal MS protocol.

Spasticity

Spasticity can assist standing in some cases and severely limit function/pain in others. Physiotherapy roles:

• Task practice and positioning
• Stretching and standing programs as tolerated (evidence and individual response vary—avoid painful aggressive forcing)
• Strengthening antagonists and functional patterns
• Advice on triggers (infection, pain, constipation, full bladder, poorly fitted equipment)
• Liaison for medical spasticity management (oral agents, botulinum toxin, ITB in specialist pathways)—do not start/stop these medications yourself

Exercise dosing principles

Exercise is generally recommended for people with MS when individualised:

Use RPE, talk test, symptom monitoring, and 24–48 hour payback as guides. If a session causes multi-day collapse, dose was too high—even if the person “completed” it.

FITT thinking for APC: Frequency and Time often need splitting into shorter bouts; Intensity should respect heat and fatigue; Type should match goals (gait efficiency vs upper-limb function vs community fitness).

Equipment and Participation

Aids (AFOs, walking poles, rollators, wheelchairs/scooters for distance) can increase participation rather than signal failure. Reason about:

• Energy cost of walking long distances
• Fall risk vs independence trade-offs
• Workplace and transport access
• Pressure care if seating increases
• Carer training for safe assistance

Goals should include participation (work, parenting, sport, community) using the ICF mindset, not only 10-metre walk speed.

Australian Context and Settings

Cases may place you in:

• Acute hospital after a relapse admission
• Outpatient neuro rehab
• Community / NDIS-related functional goals (without needing NDIS law detail)
• Rural/remote with limited specialist access—know when telehealth check-ins and clear escalation scripts matter
• Private practice mixed MSK+neuro presentation (fatigue + “bad back” secondary to gait change)

Hot Australian climates make heat planning especially relevant in outdoor mobility goals.

Red Flags and Medical Liaison (Beyond Classic Relapse)

Escalate for:

• Sudden severe neurological change
• Suspected infection with systemic features
• Respiratory compromise (less classic than ALS but possible with severe disability)
• Autonomic crisis features, severe pain crises, suicidal ideation (appropriate pathways)
• Pressure injuries, DVT signs after mobility loss
• New seizure-like events if described

Common APC Traps

Integration with Thresholds Competencies

• Shared decision-making around fatigue trade-offs and valued activities
• Evidence-informed exercise with safety monitoring
• Risk management for falls and heat
• Collaborative practice with neurology, GP, OT, speech pathology, continence services

APC Case Pattern: Choosing the Best MS Option

When four options look plausible, prefer the answer that:

1. Separates heat/fatigue fluctuation from true new lasting deficit
2. Uses pacing + cooling + individualised exercise rather than boom-bust or total rest forever
3. Introduces aids/equipment when they protect participation and safety
4. Escalates suspected relapse promptly while keeping the person safe
5. Addresses spasticity, bladder urgency, vision, and cognition when they explain the mobility problem

Australian heat waves, outdoor sports culture, and mixed private/public pathways mean heat planning and clear medical escalation scripts are not optional footnotes—they are core to competent entry-level practice.

Closing Exam Anchor

If you remember only one sentence from this section: in MS, dose exercise and balance work around fatigue and heat, escalate true new lasting neurological change, and build participation with pacing and equipment—not boom-bust heroics.