Postural instability and falls are among the symptoms of Parkinson's disease that most often lead to disability and are hardest to control with medication alone. Systematic reviews show that about 60% of people with Parkinson's disease fall at least once within a year, and nearly 40% fall repeatedly. What makes it harder, apart from the early stage of the disease, is that balance and gait problems respond little to dopamine-based drugs such as levodopa, because their cause involves non-dopaminergic pathology of the nervous system. In other words, adjusting medication alone often cannot solve falls, and exercise rehabilitation is the most effective intervention at present.
Fortunately, this area has a fairly solid evidence base. Tai chi, highly challenging balance training (HiBalance), reactive / perturbation training and multimodal exercise are all backed by randomised controlled trials and pooled analyses. This article reports honestly the real effect of each method (the evidence is currently stronger for improving balance and gait and reducing the number of falls, and weaker for reducing the number of people who fall and fear of falling). It also turns the abstract medical data into a safe training routine that patients in Hong Kong can carry out at home, timed to the medication "on" period.
Why people with Parkinson's disease need to practise balance and prevent falls
A fall is not as simple as "a careless tumble". It is often what causes a hip fracture, a head injury or even long-term bed rest, and it also sets off a vicious circle: "fall, then fear of falling again, then less activity, then fitness and balance getting worse, then falling more easily". A few key figures show how serious the problem is and how much room there is to improve.
Even among patients who have never fallen, about a third will have a first fall within a year. Research found that a patient's own rating of disability is the single most accurate predictor of falls and repeated falls, and falling confidence in balance and anxiety about falling are closely tied to this. This means fall prevention cannot wait until after a fall, and balance training should be built into the routine rehabilitation plan early.
Three main reasons Parkinson's disease affects balance
To prevent falls effectively, one must first understand why Parkinson's disease makes people unsteady on their feet. It is not caused by a single factor. Postural control, sensory integration and muscle function are all impaired at the same time, and together they produce a very high fall risk.
Poorer postural control and balance reactions
- The patient's body tends to lean forward and the centre of gravity moves forward with it, so falling forwards is easy
- When there is a sudden outside disturbance, the body's balance reaction is slower and takes longer to respond
- The step the body instinctively takes when about to fall (a protective step) becomes slow and small
Difficulty integrating sensory signals
- Proprioception declines, making it harder to feel where the arms and legs are
- The body becomes over-dependent on the eyes to keep balance, so standing is even less steady with the eyes closed or in dim light
- It is hard for the brain to integrate signals from the different senses at once to adjust posture
Changes in muscle function
- Muscle stiffness (rigidity) makes it hard for the body to adjust posture quickly
- Weak legs find it hard to support body weight and keep the body steady
- Slowness of movement means the body is always a beat behind in correcting itself when it is about to lose balance
Other factors that raise fall risk
- Freezing of gait: the feet feel stuck to the floor when starting to walk and when turning
- More severe disease, or cognitive ability starting to decline
- A previous fall, and fear of falling again
Because the causes involve several non-dopaminergic nervous systems, this also explains why simply "adding medication" may not improve balance. By contrast, exercise training aimed specifically at postural control, sensory integration and reaction speed deals directly with the problem and repairs the parts that are failing.
The consequences of falls, and the vicious circle of "not daring to move because of fear of falling"
The risk factors that lead patients to fall repeatedly include previous falls, severity of illness, movement disorder, cognitive decline, freezing of gait, reduced mobility, and a psychological factor that is often overlooked: fear of falling itself. Because of fear of falling, patients often cut down daily activity of their own accord, and the result is that fitness and balance decline faster, in a vicious circle.
To break this vicious circle, keep practising balance in a safe environment, and do not stop moving altogether out of fear of falling. The less the body moves, the faster balance and muscle strength are lost, and the higher the risk of falling becomes. Only training that is planned, properly protected and progressive can help the patient regain physical ability and confidence.
Balance training with medical evidence, and its real effects
In looking at fall prevention exercise, the most important thing is to examine objectively "how large the real effect is". Pooling several large pooled analyses gives three practical conclusions. First, exercise does improve balance and gait in people with Parkinson's disease (effect size about 0.30 in the short term and about 0.42 in the long term), and effectively reduces the number of falls (fall rate down about 49% in the short term and about 41% in the long term). Second, the same body of research also shows that the evidence for exercise reducing the "number of falls" is firmer than for reducing the "number of people who fall". In other words, exercise can help the patient "fall a few times fewer", but it is harder to guarantee "never falling at all". Third, training that is guided by professionals such as physiotherapists and is challenging enough brings clearly greater benefit.
Exercise is better at reducing the number of falls, but the evidence for reducing the number of people who fall is weaker. So keeping at it and building up enough training is more realistic than expecting a one-off fix.
Among the many types of exercise, which has the best fall prevention effect? The large Cochrane systematic review in community-dwelling older people gives a clear ranking of effect, which is very useful.
- Balance and functional exercise: reduces the number of falls by about 24% (high certainty)
- Multimodal exercise of balance, function and resistance: about 34% (moderate certainty)
- Led by professionals such as physiotherapists: greater benefit
- Enough challenge: keep pushing towards the limit of balance
- Tai chi reduces the number of falls by about 19% (still effective, but by less than the above)
- Exercise that is too low in intensity or too "easy" has a limited fall prevention effect
- Dual-task training alone (no significant improvement in balance in several pooled analyses)
- Home exercise with no guidance and insufficient progression is harder to bring up to standard
It is worth mentioning that a pooled analysis of physiotherapy specifically for Parkinson's disease (covering 191 randomised controlled trials and nearly 8,000 patients) reached a consistent conclusion: dance, martial arts / tai chi, Nordic walking, balance and gait training, aquatic therapy and other interventions all help improve balance, and strategy training improves balance and gait at the same time.
Tai chi: fall prevention exercise backed by an NEJM study
Among fall prevention exercises, tai chi has the best-known high-quality medical evidence. The New England Journal of Medicine (NEJM) published a randomised controlled trial (195 patients with mild to moderate disease, practising twice a week for 24 weeks) which found that tai chi improved postural stability more than resistance training and stretching and also significantly reduced the incidence of falls compared with the stretching group (with no significant difference from the resistance training group). The benefit was still present at the 3-month follow-up after training finished, and there were no serious adverse events.
Another pooled analysis of 5 clinical trials with 355 patients in total further confirmed that tai chi significantly lowers fall risk (OR 0.47) and improves Berg Balance Scale scores, Timed Up and Go (TUG) performance and functional reach distance. For people with Parkinson's disease, tai chi includes slow weight shifting, single-leg weight bearing and multi-directional reaching, which target exactly the core ability to keep posture steady.
Highly challenging balance training (HiBalance)
"Enough challenge" is the key to whether fall prevention training succeeds. HiBalance is a highly challenging balance training programme designed specifically for Parkinson's disease. Its core idea is to keep pushing the body to the limit of balance, with dual tasks and training elements specific to Parkinson's disease worked in. A randomised controlled trial of 100 people showed that after 10 weeks of training, patients' balance and gait performance were significantly better than the control group, and daily physical activity and everyday function also rose.
HiBalance works because it deliberately challenges several aspects of the balance system.
- Limits of stability—Practise moving the centre of gravity to the edge of what you can control and then bringing it back safely, slowly widening the range in which the body can move steadily.
- Sensory strategies—By changing visual and floor conditions (for example closing the eyes or standing on a soft pad), train the brain to integrate balance signals from the different senses again.
- Anticipatory postural adjustments—Steady the upper body before making a movement, for example adjusting the centre of gravity beforehand before stepping or reaching for something.
- Dual tasks—While keeping balance, add a task of thinking or using both hands, to imitate situations in daily life.
Note, though, that in this study patients' walking speed under dual-task conditions did not differ significantly from the control group, and neither did their fear of falling. This shows that the strength of HiBalance is in raising actual balance and gait performance, and that it is not a cure-all. Even so, it brings out a very practical core message: exercise that is too easy does little for fall prevention. Training needs to be "hard enough yet safe", and ideally a physiotherapist should adjust it to the patient's ability.
Reactive and perturbation balance training: practising the step taken before a fall
Even people with good balance in normal life will sometimes trip by accident or be bumped. Whether the body can take a protective step quicklyat that moment often decides whether the person ends up falling. Reactive / perturbation-based balance training repeatedly creates controlled "loss of balance" in a safe environment, to train the body's instinctive reaction of recovering balance automatically.
A pooled analysis of 8 randomised controlled trials with 404 participants showed that people who had perturbation training had a lower proportion of fallers (risk ratio 0.71, 95% CI 0.52–0.96) and clearly fewer falls (rate ratio 0.54, 95% CI 0.34–0.85), and this effect was equally significant in the general older population and in people with Parkinson's disease. It is one of the few training methods at present that can reduce both the "number of people who fall" and the "number of falls".
Perturbation training must have a professional present to guide it, with full safety protection.Because this kind of training deliberately makes the body lose balance, it would be very dangerous for a patient to "give themselves a push" at home. The safest approach is for a physiotherapist to lead the training in an environment with protective equipment (for example a safety harness, a handrail beside the patient, or the therapist holding the patient by hand). Only when ability has improved should safer reaction exercises (for example moving the centre of gravity quickly within a controlled range) be brought home to practise.
Dual-task training: coping with doing something while walking
In daily life we seldom "only walk". Patients often need to talk, carry things or watch the road signs while walking. People with Parkinson's disease lose balance especially easily when handling this kind of dual task. When interpreting the medical evidence here, though, great care is needed: several pooled analyses have found that dual-task training alone may not significantly improve balance or reduce falls. A randomised controlled trial that specifically compared different dual-task training models (DUALITY) also found that neither training method significantly lowered fall risk. What the study does confirm is that dual-task training helps improve the "feasibility and safety of walking", not directly "reduce falls".
The more practical approach is to treat dual-tasking as a daily safety habit, and not to rely on it alone to prevent falls.Patients should practise, when they feel their steps are unsteady, stopping what they are doing with their hands or in conversation and concentrating on standing steadily (that is, "stop first, then carry on"). In busy, crowded or outdoor settings, doing several things at once should also be avoided. This habit is more practical and reliable than relying on dual-task training to cut falls.
Progressive balance training: from static and dynamic to reactive practice
To turn the medical evidence above into action, balance training must go from easy to hard and progress step by step, building physical function and psychological confidence together. The ladder of training below should have its difficulty and progression adjusted by the physiotherapist to the patient's individual ability, and levels must never be skipped in a hurry.
- 1Level 1 | Static balance (building the base)Keep the body steady in a fixed position: first stand with the feet apart, then progress step by step to standing with the feet together (narrow base), with one foot in front of the other, and finally on one leg. Closing the eyes or standing on a soft pad can be used to make it harder, but sturdy furniture or a handrail must be within reach to hold throughout.
- 2Level 2 | Weight shifting (learning control)Slowly move the body's weight towards the left and right foot or the front and back foot and then return to the middle, to train control in the side-to-side and front-to-back directions. This lays the base for everyday movements such as reaching for things and turning.
- 3Level 3 | Dynamic balance (moving)Keep the body steady while moving. Exercises include sideways walking, walking in circles or turning, and stepping over low obstacles. Because falls happen especially easily when turning, it is advisable to take a wider circle when turning, and to turn the head first to lead the body.
- 4Level 4 | Reactive balance (training reactions)With professional safety protection, practise stepping quickly in response to a sudden disturbance, making the "step that saves you before a fall" quicker and steadier. Only once the movement is skilled and up to standard should a safe home version be used for practice at home.
The principle for raising difficulty is that the movement needs enough challenge but must also stay safe.When the patient can do a movement at a given level steadily and easily, the difficulty can be raised under the therapist's guidance (for example narrowing the distance between the feet, relying less on vision, or adding a dual task or an outside disturbance). Training that is too easy does not help prevent falls, and training that is too hard easily causes injury, and the role of a professional assessment is to help the patient find the right level.
A home balance training plan and safety notes (timed to the medication "on" period)
Practising at home is a key part of building up enough exercise, but safety must come first at all times. Because the physical state of a person with Parkinson's disease goes up and down with the effect of medication, "when to practise" is as important as "how to practise". Before each session, please go through the list below to confirm that the home environment and the timing are safe.
- Practise in the medication "on" period (usually about 1 hour after taking medicine, when mobility is at its best)
- Move away rugs, cables, clutter and other things that could trip the patient, and make sure the floor is flat and non-slip
- Have a sturdy handrail, a corner of the wall or heavy furniture beside the patient, so that there is something to hold for support at any time
- In the early stage of training a family member or carer should be with the patient, and the patient should tell them before practising
- Wear shoes that wrap the foot, are steady and non-slip, and never practise in socks alone or slippers
- Do not train when tired, straight after a meal, or in poor light indoors
- If the patient feels dizzy, has tightness in the chest or is too tired during practice, stop at once and sit down to rest
- Never force high-difficulty movements when tired or in the medication "off" period (that is, when the medicine has worn off and movements become slow and stiff)
For the daily arrangement of training, the basic framework below can be used (the whole set takes about 15–20 minutes). Please note that this is only an example, and the actual exercises, repetitions and difficulty must first be assessed and tailored by a physiotherapist.
Warm-up (about 3 minutes)
- Marching on the spot for 30 seconds
- Circle each ankle 10 times, left and right
- Raise and lower each knee in turn, 10 times each
Static balance practice (about 5 minutes)
- Stand with the feet apart for 30 seconds × 3
- Stand with the feet together (narrow base) for 20 seconds × 3
- Stand with one foot in front of the other for 15 seconds × 3 (left and right foot in front in turn)
Dynamic balance practice (about 5–7 minutes)
- Weight shift from side to side × 10
- Stepping forward × 10 (with each foot)
- Sideways walking there and back × 5
- Walking round a chair × 5 laps (clockwise and anticlockwise)
Cool-down (about 2 minutes)
- 5 deep breaths
- Stretch the calf muscles, holding 30 seconds on each side
- Walking slowly on the spot for 1 minute
It must be stressed that how well home exercise works depends to a large extent on "whether a professional is guiding it" and "whether the training is challenging enough". Medical evidence shows that exercise led by professionals brings clearly greater benefit, and home rehabilitation training can take place directly in the home setting the patient knows, so that the therapist designs the movements around the actual floor material, furniture layout and daily walking routes. This not only greatly raises safety during training but also helps the patient apply the balance skills learned directly to daily life.