Many families become very anxious when they hear which stage of Parkinson's disease the patient has reached. In fact the question closest to home is not how much time is left, but what the physiotherapy should focus on at this stage. As the disease moves from the early stage to the late stage, the goals of physiotherapy go through a fundamental change. In the early stage the aim is to build a high-intensity exercise habit while function is still good. In the middle stage it turns to gait cueing and fall-prevention training. In the late stage it focuses on maintaining joint range of motion, safe transfers and preventing complications. This page goes through the five Hoehn & Yahr stages most used in clinical practice one by one, compares the physical condition and the core physiotherapy goals at each stage, and clarifies which approaches have research evidence, which remain medical hypotheses, and which kinds of training do not work in patients with severe disease.
To first get a full picture of the four motor symptoms and the non-motor symptoms of Parkinson's disease, it is advisable to read the page on Parkinson's disease symptoms and physiotherapyone level up. This page concentrates on setting the stages of the disease against the physiotherapy prescription, which goes a step further than the general call that people with Parkinson's disease should exercise more.
Principle of division of professional roles: a physiotherapist does not and should not decide the patient's stage.Hoehn & Yahr staging is a medical diagnosis, generally made by a neurologist using clinical scales such as the MDS-UPDRS. The physiotherapist assesses the patient's daily functional ability and designs the training plan to fit the stage diagnosed by the doctor. This page describes the rehabilitation focus at different stages so that patients and families understand the direction of rehabilitation, and it is not meant for people to work out their own stage.
The five Hoehn & Yahr stages of Parkinson's disease
The Hoehn & Yahr scale was created by Hoehn and Yahr in 1967 (Hoehn & Yahr 1967) and is still the indicator most widely used in medicine to describe the progress of Parkinson's disease. This classification follows a very clear line in describing how the disease develops: from one side affected, to both sides, then impaired balance, and finally whether daily life needs help from others.
| Stage 1 (H&Y 1) | Symptoms appear on one side of the body only (unilateral), and daily life is basically not affected. |
| Stage 2 (H&Y 2) | Symptoms are on both sides, but balance is not impaired. |
| Stage 3 (H&Y 3) | Balance begins to get worse (the pull test is positive), but the patient can still look after themselves and live independently. |
| Stage 4 (H&Y 4) | Mobility is severely affected and the patient needs help with daily life, but can still stand or walk short distances alone. |
| Stage 5 (H&Y 5) | The patient needs a wheelchair to go out or is bedridden long term, and needs round-the-clock care for daily living. |
Disease stage and an individualised rehabilitation prescription
Before going through the rehabilitation programme stage by stage, a common myth needs to be dispelled: the idea that at stage X the standard exercises for stage X should simply be followed is an oversimplification. The Hoehn & Yahr scale is only a rough ladder. Even in the same stage, the actual mobility of two patients can be very different. The speed of decline also varies from person to person, and some patients stay stable for many years in the early stage. The role of staging is therefore to give doctors and therapists a general direction, while the specific rehabilitation training must be designed to fit the patient's real condition at the time.
Staging answers which direction the treatment goals should turn, and it does not tell which set of movements to copy at which stage. Differences within the same stage can be large, and the prescription must be individualised.
Early stage (H&Y 1–2): building a high-intensity exercise habit
Physiotherapy in the early stage is not a remedy after the event. It uses the time while the patient's physical function is still good to build a moderate- to high-intensity exercise habit that can be kept up for many years. The clinical practice guideline published by the American Physical Therapy Association (APTA 2022, Osborne and colleagues) promotes this model of early intervention: start aerobic exercise of sufficient intensity early, supported by training aimed at specific daily tasks and behaviour change.
Two high-quality randomised controlled studies laid the groundwork for this direction. The SPARX study (Schenkman 2018) recruited newly diagnosed patients in the early stage who had not yet started medication, and had them do high-intensity treadmill training (80–85% of maximum heart rate). After six months the UPDRS motor score of the exercise group stayed steady with no decline, while the control group clearly got worse. The Park-in-Shape study (van der Kolk 2019) had patients cycle at high intensity on a stationary bike at home under remote supervision. After six months the MDS-UPDRS motor score of the exercise group was 4.2 points better than that of the control group who only did stretching, and maximal oxygen uptake (VO₂max) also improved significantly.
Managing expectations objectively: the idea that exercise is neuroprotective is still a scientific hypothesis, and it has not been proved that exercise can cure the disease.What the SPARX and Park-in-Shape studies confirmed is that exercise can slow the decline in motor function (as measured on the UPDRS scale). They did notprove that exercise protects brain cells, reverses the disease or cures Parkinson's disease in humans. Patients and families need to understand this, and should not be misled by the common claim that exercise protects the nerves.
Another training approach suited to starting in the early stage is large-amplitude movement training (LSVT BIG). The Berlin LSVT BIG study (Ebersbach 2010) tested it in patients with mild to moderate disease and found that LSVT BIG improved the UPDRS motor score more effectively than Nordic walking and ordinary home exercise, which suits the problem of movements getting smaller that already begins to appear in the early stage.
Middle stage (H&Y 2.5–3): gait cueing, balance training and fall prevention
When the disease reaches the middle stage and the patient begins to have impaired balance, the focus of physiotherapy turns from "building fitness" in the early stage to "improving gait and balance". The key reason for the change is that freezing of gait (FOG) increases sharply at this stage. The medical literature indicates that the prevalence of FOG is about 28% at H&Y ≤2.5 and rises to 68% at H&Y ≥2.5, which confirms that the middle stage is the key time to introduce cueing training.
Cueing training is the treatment with the best research evidence in the middle stage. Using the sound of a metronome, lines on the floor or commands such as "take a big step", it helps the brain bypass the blocked automatic walking circuit. A systematic review (Cosentino 2020, 19 randomised studies with 913 participants in total) found that physiotherapy moderately improves freezing of gait and that the effect lasts for a time. If it is combined with highly challenging balance training, standing stability and walking speed improve further.
The effect of cueing fades once practice stops. The RESCUE trial of cueing training at home (Nieuwboer 2007, patients at H&Y II–IV) found that although cueing improves gait, reduces freezing and raises balance, these effects clearly fade after training stops (6-week follow-up). This shows that training must be kept up and built into the environment of daily life. In addition, if the patient practises repeatedly in a familiar home environment, the training effect is also easier to keep.
Late stage (H&Y 4–5): maintaining range of motion, safe transfers and preventing complications
In stages 4 and 5, the goal of physiotherapy goes through another fundamental change. It no longer aims to reverse the disease or restore former function, but works to maintain quality of life and prevent complications. European physiotherapy guidelines also describe this stage as aimed at "maintenance / palliation". The focus of care at this stage includes:
- Maintain the range of joint movement with passive or active joint exercises, to prevent muscle contracture and deformity of posture.
- Teach safe turning in bed and techniques for transferring from bed to chair (sit-to-stand transfers). This helps the patient and also protects the backs of the patient and the carer from strain.
- Set the patient in a suitable lying or sitting position, and help to turn the patient at regular intervals, to prevent pressure sores.
- Do breathing exercises and chest care, to reduce the chance of aspiration pneumonia.
- Strengthen the guidance of carers' skills and modify the home environment. At the late stage, these two things are often more important than asking the patient to exercise.
- Do not carry on the early-stage, mild-disease practice of preventing falls by doing more exercise (the next section explains the clinical data in detail).
Clarifying how strong the research evidence is. There are indeed fewer high-quality randomised controlled studies of late-stage patients, and the existing literature is mostly case reports and expert consensus. However, maintaining joint range of motion, safe transfers and preventing complications are still the focus of care that clinical guidelines in different countries agree on. Although the approach in the late stage is based more on clinical consensus than on large RCT data, the direction of care is still clear and sound.
Table: physical condition, physiotherapy goals and strength of evidence at each stage
Condensing the focus of the early, middle and late stages above into a comparison table shows more clearly how the rehabilitation goals change as the disease develops:
| H&Y 1–2 (early · one side to both sides) | Physical condition: can still walk freely and balance is not impaired. Main goal: build a moderate- to high-intensity aerobic habit, and large-amplitude movement training. Representative interventions: high-intensity cycling / treadmill, LSVT BIG. Evidence: strong RCTs (SPARX, Park-in-Shape, Ebersbach); neuroprotection is still a hypothesis. |
| H&Y 2.5–3 (middle · impaired balance) | Physical condition: begins to be unsteady, more freezing of gait, falls easily. Main goal: gait cueing, highly challenging balance training, fall prevention. Representative interventions: rhythmic auditory / visual cues, challenging balance, home cueing. Evidence: moderate from meta-analyses (Cosentino, Shen); the effect fades when practice stops (RESCUE). |
| H&Y 4–5 (late · needing help to bedridden) | Physical condition: needing help, up to wheelchair or bed. Main goal: maintain joint range of motion, safe transfers, prevent complications (contracture / pressure sores / pneumonia). Representative interventions: joint exercises, transfer training, positioning, chest care, carer training. Evidence: mainly guideline consensus, with few large RCTs. |
How the effect of exercise on preventing falls differs with the severity of the disease
It is commonly assumed that doing physiotherapy exercise means the patient will not fall, and this oversimplified myth needs to be cleared up. The counter-example most often cited in medicine is the study by Canning 2015 (published in Neurology). The overall data show that exercise did not significantly reduce the number of falls, but when the data were broken down by severity of the disease, a highly significant interaction (p<0.001) was found. In the group of milder patients, the fall rate fell significantly after they took part in exercise (IRR 0.31, a reduction of about 70%). In the group with more severe disease who did the same exercise programme, there was a trend toward more falls (IRR 1.61).
This result directly supports the logic of adjusting treatment by stage. Patients with mild to moderate disease can indeed prevent falls through exercise and balance training. When the disease worsens to the severe stage, however, the focus of fall prevention must turn to modifying the home environment, using assistive devices, learning safe transfer techniques and training carers more, and not to blindly increasing the amount of exercise. Choosing the wrong exercise intensity can backfire. Assessing the stage of the disease and the fall risk must therefore be left to the professional judgement of the physiotherapist.
Two clinical limits to bear in mind: (1) The present human studies show only that exercise can "slow the decline in motor function (UPDRS)" and cannotcure the disease. (2) The RESCUE study shows that the effects of cueing and balance training fade after practice stops, so practice must be kept up and built into daily life. Any claim that the disease can be "reversed" or that the problem is solved once and for all cannot be trusted.
How home physiotherapy fits the needs of patients at different stages in Hong Kong
According to local reports, there are about 12,000 people with Parkinson's disease in Hong Kong, and the average age at onset is between 60 and 70 (CUHK Medical Centre, 2022). For community support, organisations including the Hong Kong Parkinson's Disease Association (香港柏金遜症會) and the Hong Kong Society for Rehabilitation community rehabilitation network offer help to patients and families. It is worth noting that Hong Kong has an internationally recognised research base in Parkinson's disease rehabilitation. A meta-analysis of balance and gait training published by a research team at The Hong Kong Polytechnic University (scholars including Mak, Wong-Yu and Shen; Shen 2016, published in Neurorehabil Neural Repair) is widely cited around the world. It confirmed that exercise improves patients' balance and gait and reduces falls, and that training carried out in rehabilitation facilities was especially effective.
This research finding has two messages for home treatment. First, training in facilities has a larger effect, which is a reminder that rehabilitation at home must never be done half-heartedly and must keep up enough difficulty with professional supervision. Second, the black spots where patients fall most are at home (such as the corridor, bathroom and bedside), so cueing and balance training done at enough difficulty in the real home setting best meets actual needs. The RESCUE study also confirmed that training must continue and be built into home life to keep its effect. When a physiotherapist visits, practice in the real setting and modification of the home can be carried out directly in the patient's actual living environment, and family members living with the patient can be shown correct supporting and lifting techniques on the spot. This is the core value of home physiotherapy in keeping to the rehabilitation goals of each stage.