Parkinson's disease is a chronic, progressive neurodegenerative disease. It cannot be cured, but its symptoms can be managed. To understand the disease, the signs first need to be divided into two groups: the motor symptoms, which are easy to see on the surface, and the non-motor symptoms, which are often overlooked but have far-reaching effects. This article goes through the four motor symptoms one by one and matches each directly with physiotherapy strategies that have evidence behind them. It then uses the Hoehn & Yahr stages to explain the focus at different stages, and ends with a short introduction to non-motor symptoms and the "on-off" phenomenon.
One point should be made clear first: physiotherapy has evidence of improving gait, balance and functional mobility, but the improvements are mostly small to moderate and concentrated in the short term, so the results must be built up by continuing and regular practice. It is not a miracle cure that reverses the disease. It is a long-term way to maintain physical function, delay disability and reduce the risk of falls.
Symptoms of Parkinson's disease: starting with the four motor symptoms
In clinical diagnosis, the core motor signs of Parkinson's disease are four, known together by the acronym "TRAP": resting tremor (Tremor), muscle rigidity (Rigidity), slowness of movement (Akinesia / Bradykinesia) and postural instability (Postural instability). These four are the core signs recognised in medicine (Jankovic 2008). The disease mostly starts on one side and then slowly spreads to the other side, and the combination and severity of symptoms differ from patient to patient.
The most direct way to see what physiotherapy does is to set the symptoms side by side and look at their clinical presentation, their effect on daily life and the matching direction of treatment:
| Resting tremor (Tremor) | The patient trembles while at rest, but the tremor eases during movement. Medical textbooks generally give the frequency of this tremor as about 4–6 Hz, and the thumb and index finger look as if they are "rolling a pill". The main goal of physiotherapy is not to remove the tremor, but to reduce its effect on daily movements through functional tasks, relaxation techniques and ways of shifting attention. |
| Muscle rigidity (Rigidity) | The patient's muscle tone stays raised. When the therapist moves the limb, there is an even resistance (lead-pipe) or a jerky resistance (cogwheel). It is common in the neck, trunk and limbs, causes pain and makes the body lean forward. Physiotherapy improves mobility and eases discomfort through stretching, joint range of motion training, trunk rotation and posture training. |
| Slowness of movement (Bradykinesia) | The patient has difficulty starting and generating force, and the size of movements shrinks. Handwriting gets smaller, steps get shorter, the face becomes stiff like a mask, and blinking is reduced. This is the core symptom that makes patients feel least able to cope. Physiotherapy uses large-amplitude movement training (LSVT BIG) to help the patient rebuild the size of movement, which directly addresses this symptom. |
| Postural instability (Postural instability) | The patient's balance reflexes weaken, and together with a forward-leaning posture and a hurried or freezing gait, the risk of falls rises sharply. This is mostly seen in the middle and later stages of the disease. Physiotherapy combines balance training, gait strategies, rhythmic auditory cueing and a home environment assessment to reduce the chance of falls from several directions. |
The principle of physiotherapy is to match the method to each symptom, and not to give everyone the same exercise prescription.Even among people with the same Parkinson's disease, the rehabilitation focus is very different for a patient whose main problem is tremor and for a patient troubled by slowness of movement or balance problems. A personalised assessment and a training prescription designed for the patient are therefore important.
Resting tremor (Tremor)
Tremor is the best-known sign of Parkinson's disease. Typically it is obvious at rest and eases or disappears with deliberate movement. Standard neurology textbooks give the tremor frequency as about 4–6 Hz, and the thumb and index finger often make a rubbing movement commonly called "pill-rolling". These are common descriptions in medical textbooks. It should be made clear that physiotherapy does not take "removing the tremor" as its main goal (because the response of tremor to medicine and other treatments is quite complex). The focus is instead on helping the patient complete everyday movements such as holding a cup of water or fastening buttons while the tremor is present, and using relaxation and attention techniques to reduce the interference caused by the tremor.
Muscle rigidity (Rigidity)
Muscle rigidity means that muscle tone is persistently raised. When the therapist moves the patient's arms or legs passively, resistance is felt. If the resistance is even and consistent it is called "lead-pipe", and if there are jerky catches of resistance together with tremor, it is called "cogwheel". This stiffness can affect the neck, trunk and limbs, and over time causes pain in the shoulders, neck, waist and back and makes the body lean forward. To deal with stiffness, physiotherapy mainly uses stretching, joint range of motion training, trunk rotation and posture correction, to keep the joints flexible, ease pain and prevent the posture from becoming fixed and worse in the long term.
Slowness of movement (Bradykinesia)
Slowness of movement is the core sign of Parkinson's disease and the one that makes patients feel the loss of mobility most: difficulty starting, smaller movements and a slower rhythm. Clinically, handwriting gets smaller and smaller (micrographia), steps get shorter, the face lacks expression (mask face) and blinking is less frequent. The physiotherapy programme that fits this problem best is large-amplitude movement training (LSVT BIG). The Berlin LSVT BIG randomised controlled study (Ebersbach 2010) found that after 16 sessions of training, the UPDRS motor score in the LSVT BIG group improved by an average of 5.05 points, while the control group, who did Nordic walking and home exercise, got slightly worse. The LSVT BIG group also did better on the Timed Up and Go (TUG) and the 10-metre walk time.
How should the figure of "5.05 points" be understood? This is the relative gap between the LSVT BIG group and the control group (whose scores got worse rather than better), and it cannot be read simply as the disease having been "reversed by 5 points". The real message of this data is that high-intensity training aimed at the size of movement has a clear direction and is better than ordinary exercise, but practice still has to continue after the course is finished to consolidate the effect.
Postural instability and risk of falls (Postural Instability)
Postural instability mostly appears in the middle and later stages of the disease. Of the four symptoms, it responds least well to medicine and is the most dangerous. Because the patient's balance reflexes are impaired, and together with slowness of movement, a forward-leaning body and freezing of gait, a fall happens easily at the slightest slip. How serious is the threat from falls? A meta-analysis of prospective studies found that about 46% of patients fell at least once within just 3 months (Pickering 2007). This explains why balance training and fall prevention are core work in physiotherapy.
Which symptoms physiotherapy can improve, and the related clinical research
"What can physiotherapy actually improve?" needs an objective answer. The most representative evidence is currently a Cochrane systematic review (Tomlinson 2013), which pooled 39 randomised controlled trials with 1,827 participants and compared physiotherapy with no intervention. The results show that physiotherapy helps to improve walking speed, walking distance, freezing of gait, balance and clinical disability scores. However, the review authors also state clearly that most of these differences are small in size and mainly short term (less than 3 months), and that there was no statistically significant difference in reducing the number of falls or in raising patients' self-rated quality of life.
Other training approaches are also supported by clinical evidence, but results should be viewed realistically. Treadmill training helps to improve motor function and functional mobility (Boccali 2025: UPDRS-III about −1.36 and TUG about −1.75 seconds, but the 6-minute walk distance did not reach statistically significant difference). Rhythmic auditory cueing (RAS / cueing) has an overall positive effect on raising walking speed and stride length (Ghai 2018, 50 studies, 1,892 participants). A large pooled analysis covering 12 types of approach, 191 RCTs and 7,998 participants(Radder 2020), also confirms that physiotherapy approaches such as resistance training, treadmill training and dance benefit motor symptoms, gait, balance or quality of life. On international clinical guidelines, the NICE guideline (NG71) also recommends specialist physiotherapy with clinical experience in Parkinson's disease for patients with balance or motor function impairment.
What should be expected of physiotherapy? Clinical research shows that physiotherapy can improve gait, balance and daily mobility, but the improvements are mostly small to moderate and need long-term commitment. It cannot reverse the disease to any large degree, but with persistence it can maintain physical function, slow deterioration and reduce the risk of falls, which remains very important for keeping up quality of daily life.
Hoehn & Yahr stages and the treatment focus at each stage
The Hoehn & Yahr scale (1967) is the indicator most used in medicine to assess the progress of Parkinson's disease, and divides the disease from mild to severe into stages 1 to 5. For patients' families, the most practical use of this scale is to answer "what physiotherapy should focus on at this stage". The table below sets out the signs of the five stages next to the matching focus of physiotherapy treatment for reference (the speed of progression differs from person to person, and the stages are for reference only):
- Stage 1, one side affected: Symptoms appear on one side of the body only, and daily life is basically unaffected.
- Stage 2, both sides affected: Symptoms spread to both sides and posture begins to be affected, but there is no balance impairment.
- Physiotherapy focus: Build an exercise habit, maintain activity level and flexibility, large-amplitude movement training and posture correction, laying a foundation while the base is still good.
- Stage 3, mild to moderate: Balance impairment appears and the pull test is positive, but the patient can still live independently.
- Stage 4, severe disability: The patient needs help but can still stand or walk short distances.
- Stage 5, fully dependent: The patient needs a wheelchair or is bedridden and needs round-the-clock care.
- Physiotherapy focus: From stage 3, balance training and fall prevention are the core. In the later stages, the focus turns to transfer training, maintaining joint range of motion, preventing complications and guiding carers.
The key turning point of the disease is between stage 2 and stage 3. When the patient enters stage 3 and balance problems begin to appear, the focus of physiotherapy should turn to preventing falls. Starting training early at this stage is usually more effective than a remedy after a fall and injury.
Commonly used assessment tools: MDS-UPDRS, TUG and the Berg Balance Scale
To follow changes in the disease and progress in rehabilitation objectively, the therapists who provide home physiotherapyuse standardised assessment tools. Knowing these scales helps families to understand the therapist's assessment criteria:
Common non-motor symptoms
In discussing Parkinson's disease, paying attention only to hand tremor and slow movement overlooks the other side of the disease. The multicentre PRIAMO study (Barone 2009) followed 1,072 patients and found that as many as 98.6% had at least one non-motor symptom, and on average about 7.8 each. These symptoms, which involve the autonomic, sleep, neuropsychiatric and sensory systems, are not only very common, but some also appear years before the motor symptoms(Chaudhuri 2006), and their impact on quality of life can even exceed that of motor impairment. One study indicates that the main factors affecting patients' quality of life are in fact non-motor problems, with depression the most important of them (Schrag 2000).
Autonomic and sensory problems
- Orthostatic hypotension, meaning dizziness and blurred vision on standing up
- Constipation, which may already be present years before the motor symptoms
- Urinary frequency, urgency, night-time urination, and drooling (sialorrhoea)
- Reduced sense of smell, one of the common early symptoms
- Musculoskeletal pain, mostly related to muscle rigidity
Sleep and neuropsychiatric problems
- REM sleep behaviour disorder, in which the patient makes large movements or talks in their sleep
- Insomnia, daytime sleepiness and restless legs
- Fatigue, affecting about 58% of patients (PRIAMO)
- Anxiety, about 56% (PRIAMO), often linked to the "off" period
- Depression, pooled prevalence about 38% (Cong 2022); apathy and cognitive impairment are also common
Non-motor symptoms are not the main area of physiotherapy, but they still need attention. Reduced sense of smell, constipation and REM sleep behaviour disorder can all occur years before the motor symptoms (the prodromal phase). Most non-motor symptoms need follow-up by a multidisciplinary medical team, including neurology, occupational therapy, speech therapy and psychologists. Identifying them early and referring the patient to the right professional helps to improve overall quality of life.
The "on-off" phenomenon and scheduling training
After taking levodopa for a long time, many patients experience fluctuations in the effect of the medicine, and the body state moves back and forth between the "on" period (the medicine is working and movement is freer, although dyskinesia sometimes appears) and the "off" period (the medicine wears off and stiffness and slowness get worse, sometimes with anxiety and pain). This phenomenon directly affects how rehabilitation training is arranged: the ideal time for training is usually in the "on" period, generally about 1 hour after taking the medicine, because the patient is better able to cope with higher-intensity training movements at this time.
The first step in making a personalised training plan is to record the ups and downs of the body state each day.Patients and families can use a simple diary to note the times of the "on" and "off" periods each day and how the body feels. The therapist can then schedule training for the times when the patient is at their best, and adjust the amount of exercise as needed. This avoids the patient being frustrated by forcing training in the "off" period, or even raising the risk of falls.