Amyotrophic Lateral Sclerosis (ALS) is a progressive neurological condition that affects the motor neurons, the specialised nerve cells that control voluntary muscle movement. Motor neurons transmit signals from the brain and spinal cord to muscles, allowing everyday actions such as walking, lifting objects, speaking, swallowing and breathing. In ALS, these neurons gradually degenerate and die, meaning muscles no longer receive the signals they need to function.
ALS is the most common form of motor neurone disease (MND) and involves damage to both upper motor neurons (which originate in the brain) and lower motor neurons (which connect the spinal cord to muscles). As a result, people with ALS experience increasing muscle weakness, stiffness and wasting, eventually leading to paralysis. Importantly, ALS does not usually affect sensation, bladder or bowel function, or intellectual ability.
In Australia, ALS is considered a rare condition. Men are slightly more likely to develop ALS than women. While there is currently no cure, early diagnosis and access to multidisciplinary care, including physiotherapy for ALS, can significantly improve comfort, independence and quality of life. Physiotherapists play a central role in ALS management by supporting mobility, respiratory function, posture and participation in daily activities throughout all stages of the condition.
Key Facts
Risk Factors
- Increasing age, particularly over 50 years
- Male sex, especially in earlier decades of life
- Family history of ALS or known genetic mutations
- Possible environmental or occupational toxin exposure
Symptoms
- Progressive muscle weakness in the arms or legs, often starting on one side of the body
- Muscle twitching (fasciculations) and cramping
- Muscle wasting (atrophy), particularly in the hands, shoulders and thighs
- Slurred or nasal speech and difficulty projecting the voice
- Difficulty swallowing (dysphagia), coughing or choking on food and fluids
- Changes in walking pattern, frequent tripping or reduced balance
- Emotional lability, such as involuntary laughing or crying
- Shortness of breath due to weakening of the respiratory muscles in later stages
Aggravating Factors
- Physical fatigue, particularly with repetitive or sustained muscle use
- Prolonged walking, standing or stair climbing as leg weakness progresses
- Speaking for long periods, which may worsen speech fatigue in bulbar-onset ALS
- Poor seating or unsupported posture, increasing strain on weakened trunk muscles
Causes
The exact cause of ALS is unknown in most cases. Approximately 90 percent of people are diagnosed with sporadic ALS, meaning there is no clear family history. The remaining cases are classified as familial ALS, where inherited genetic mutations increase the risk of developing the condition.
Several biological mechanisms are thought to contribute to motor neuron degeneration. These include genetic mutations affecting nerve cell function, excess levels of the neurotransmitter glutamate leading to nerve cell toxicity, oxidative stress causing cellular damage, and abnormal inflammatory responses within the nervous system. Environmental factors such as exposure to pesticides, heavy metals or other toxins have also been investigated, although evidence remains inconclusive.
It is important to note that ALS is not contagious and is not caused by physical activity, diet or lifestyle choices. Regardless of cause, physiotherapy focuses on managing the functional consequences of motor neuron loss, helping people adapt safely as strength and mobility change over time.
How Is It Diagnosed?
ALS is diagnosed based on a combination of clinical assessment, neurological examination and exclusion of other conditions. There is no single test that confirms ALS. Neurologists assess patterns of muscle weakness, reflex changes and signs of both upper and lower motor neuron involvement.
Diagnosis can be challenging in the early stages, as symptoms often develop gradually and may mimic other neurological or musculoskeletal conditions. Early referral is important, as timely diagnosis allows earlier access to multidisciplinary management, including physiotherapy, respiratory support and assistive equipment.
Investigations & Imaging
- Electromyography (EMG)
- Assesses electrical activity of muscles and helps identify lower motor neuron degeneration.
- Nerve conduction studies
- Evaluate nerve function and help rule out peripheral neuropathies.
- Magnetic resonance imaging (MRI)
- Used to exclude other causes of symptoms such as spinal cord compression or brain pathology.
- Blood and genetic tests
- May help exclude other conditions or identify familial ALS mutations.
Grading / Classification
- ALS Functional Rating Scale – Revised (ALSFRS-R)
- A 48-point scale assessing function across speech, swallowing, mobility and breathing, commonly used to monitor disease progression.
- Early Stage ALS
- Mild muscle weakness or stiffness with minimal impact on daily activities.
- Middle Stage ALS
- Increasing weakness, fatigue and mobility limitations, often requiring assistive devices.
- Late Stage ALS
- Severe muscle weakness, respiratory compromise and high dependence on carers.
Physiotherapy Management
Physiotherapy for ALS is an essential component of care from diagnosis through to advanced stages. The focus of ALS physiotherapy is not to reverse the disease, but to optimise movement, reduce secondary complications and support independence for as long as possible. Physiotherapists work closely with neurologists and other allied health professionals to adjust management as the condition progresses.
Exercise
ALS physiotherapy exercises are carefully prescribed based on disease stage, strength levels and fatigue.
- Gentle range-of-motion exercises help maintain joint mobility and reduce stiffness, particularly in the shoulders, hips and ankles where immobility can lead to contractures.
- Low-intensity strengthening may be appropriate for unaffected or mildly affected muscles, with close monitoring to avoid overwork weakness.
- Stretching programs are often prioritised as ALS progresses to manage spasticity and maintain comfort.
Activity Modification
Activity modification is a key part of ALS rehab. Physiotherapists help individuals adapt daily tasks to conserve energy, reduce falls risk and maintain participation. This may include breaking activities into shorter tasks, using seated strategies for personal care, or modifying walking distances. As mobility changes, physiotherapists guide safe transitions to mobility aids such as walking frames or wheelchairs.
Manual Therapy
Manual therapy is used conservatively in ALS physiotherapy to manage secondary musculoskeletal issues rather than the neurological disease itself. Gentle joint mobilisation and soft tissue techniques may help relieve stiffness, reduce discomfort and improve comfort during movement or positioning, particularly when muscle weakness alters normal biomechanics.
Bracing & Taping
Bracing and taping can support weakened muscles and joints in ALS. Ankle-foot orthoses may be prescribed to manage foot drop and improve walking safety, while hand splints can support function and prevent contractures. Physiotherapists assess timing carefully to ensure supports enhance independence rather than restrict movement.
Heat & Ice
Heat and ice may be used in ALS physiotherapy to manage secondary pain related to muscle stiffness or joint immobility. Heat can assist muscle relaxation before stretching, while ice may help settle localised discomfort following activity. These strategies are adjuncts and are always individualised.
Tens
TENS may be used selectively to assist with pain management related to secondary musculoskeletal issues in ALS, rather than nerve degeneration itself. Physiotherapists assess suitability and provide guidance on safe use.
Education
Physiotherapists provide guidance on pacing, fatigue management, safe transfers, respiratory awareness and when to seek review. Education empowers people with ALS and their carers to adapt confidently as physical abilities change.
Other
Other physiotherapy interventions include respiratory physiotherapy, such as breathing exercises, chest mobility work and supported cough techniques. As respiratory muscles weaken, physiotherapists collaborate with respiratory teams to optimise ventilation support and secretion management.
Other Treatments
Other treatments for ALS include medications such as riluzole, which may modestly slow disease progression, and edaravone in selected cases. Non-invasive ventilation, cough assist devices and nutritional support are commonly used. Other allied health practitioners also play a role:
- Occupational therapists support daily living through home modifications, energy conservation techniques, and adaptive equipment.
- Speech pathologists assist with communication strategies, swallowing assessment, and augmentative communication devices if speech is lost.
- Psychologists provide mental health support to patients and families coping with the emotional impact of the condition.
- Dietitians can offer nutritional support and recommend a high-energy diet if required.
Surgery
Surgery is not a treatment for ALS itself. Surgical procedures may be considered for supportive reasons, such as insertion of a feeding tube (PEG) to maintain nutrition when swallowing becomes unsafe. Physiotherapists are involved in pre- and post-procedure mobility and respiratory care.
Prognosis & Return to Activity
ALS is a progressive condition with variable rates of decline. Most people live between two and five years after diagnosis, although some live significantly longer with comprehensive care. Prognosis is influenced by age at onset, site of onset and access to multidisciplinary services, including regular physiotherapy and respiratory management.
Complications
- Progressive loss of mobility and independence
- Respiratory failure due to diaphragm and chest muscle weakness
- Malnutrition and dehydration from swallowing difficulties
- Secondary joint contractures and pressure injuries
Preventing Recurrence
- Regular physiotherapy-led stretching to reduce joint stiffness and contracture risk
- Early prescription of mobility and seating equipment to reduce falls and pressure injuries
- Ongoing review of posture and positioning as muscle weakness progresses
When to See a Physio
- At the time of diagnosis to establish a baseline and begin ALS physiotherapy management
- If walking becomes unsafe or falls occur
- When stiffness, pain or fatigue begin to limit daily activities
- If breathing feels more difficult or coughing becomes weak