Virtual reality gait training shows lasting mobility gains in Parkinson’s

Both aquatic Tai Chi and virtual reality (VR) training improved walking, balance, mobility, and gait symmetry in people with Parkinson’s disease. However, VR training led to greater improvements in several measures and maintained some of these benefits three months after training ended, a small clinical trial found.

The study compared aquatic Tai Chi with training using the Computer Assisted Rehabilitation Environment (CAREN), an advanced virtual reality system that provides patients with visual cues and real-time feedback while they practice walking, over 12 weeks (about three months).

At the end of the 12-week intervention, participants using CAREN performed better across measures of Parkinson’s motor symptoms, balance, mobility, walking endurance, walking speed, and gait symmetry. Some of those advantages remained for another three months after training ended.

The study, “Effects of Aquatic Tai Chi and Computer Assisted Rehabilitation Environment-Based Virtual Reality Training on Rehabilitation in Patients with Parkinson Disease: A Randomized Controlled Trial,” was published in the journal Archives of Physical Medicine and Rehabilitation.

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Parkinson’s disease is characterized by motor symptoms such as slowed movement, balance problems, and impaired walking. The disease is caused by the loss of dopamine-producing nerve cells, which release the neurotransmitter dopamine, a chemical messenger that enables nerve cells to communicate and, among other functions, helps regulate movement.

Gait difficulties are a major contributor to disability, falls, and reduced quality of life in Parkinson’s.

Although medications that replace or mimic the effects of dopamine are a cornerstone of Parkinson’s treatment, their long-term ability to control walking and balance problems is limited as the disease progresses. Exercise and rehabilitation, therefore, play an important role in maintaining mobility.

Tai Chi emphasizes controlled weight shifting, posture, and coordinated movement. Aquatic Tai Chi allows people to practice slow, controlled movements in water with less weight bearing.

VR-based training offers another rehabilitation approach aimed at improving balance, walking, and functional mobility. Computer-generated environments can provide visual cues and real-time feedback while patients practice walking tasks under controlled conditions. In Parkinson’s, this type of training may help compensate for difficulties with the automatic control and adaptation of walking.

CAREN is an advanced VR system that combines a treadmill and motion platform with visual feedback and changing simulated walking environments.

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VR training included crossing simulated suspension bridge

In this study, the researchers compared the effects of aquatic Tai Chi versus CAREN-based VR gait training. The study (ChiCTR2400088282) enrolled 50 people with mild to moderate Parkinson’s who also had balance impairment. They were randomly assigned to CAREN (24 participants) or aquatic Tai Chi (26 participants).

Both groups completed individual, therapist-supervised 40-minute sessions five days a week for 12 weeks. Aquatic Tai Chi was performed in chest-deep warm water and incorporated walking exercises followed by a simplified Tai Chi sequence emphasizing slow, coordinated movements, controlled weight shifting, and postural stability.

Those assigned to CAREN practiced tasks in simulated environments, including following footstep targets, crossing a virtual suspension bridge, and walking along a simulated forest path with slopes and turns. The exercises required participants to continually adjust their gait in response to visual information and changes in the virtual environment.

Participants were assessed before treatment and after six, 12, and 24 weeks, with the final assessment occurring 12 weeks after the intervention ended. Forty people — 20 in each group — completed the trial. No serious adverse events were reported, although one CAREN participant withdrew because of dizziness.

At 12 weeks, VR participants showed more improvement in gait

Both rehabilitation programs led to significant improvements in multiple measures of motor and walking function compared with the beginning of the trial.

However, at the end of the 12-week intervention, participants in the CAREN group had lower scores on the motor section of the Unified Parkinson’s Disease Rating Scale, indicating less severe motor symptoms, than those practicing aquatic Tai Chi. They also had better balance, faster performance on the Timed Up and Go test, which assesses mobility and dynamic balance, and longer distances on the six-minute walk test, which measures walking endurance.

CAREN participants also walked faster, took longer steps, had a higher cadence — the number of steps taken per minute — and completed each gait cycle more quickly. Their walking was also more symmetrical between the left and right sides.

Both interventions improved gait- and balance-related function in individuals with [Parkinson’s disease].

By week 24, some of the differences between the groups had disappeared. Motor symptom scores, mobility test times, walking endurance, and overall walking speed were no longer significantly different between the groups. However, CAREN participants continued to show better balance, walking speed, time spent with their foot on the ground, and overall walking pattern, including more symmetrical hip, knee, and ankle movements.

The researchers reasoned that CAREN’s benefit may stem from its repeated use of external visual cues and immediate feedback, which allows patients to detect and correct problems with step length, timing, and posture while walking. Aquatic Tai Chi instead provides reduced weight-bearing and continuous water resistance, promoting controlled weight shifts and postural regulation.

Overall, “both interventions improved gait- and balance-related function in individuals with [Parkinson’s disease],” the researchers wrote.

According to the team, CAREN may be particularly useful when the goal is to achieve earlier improvements and maintain gains in gait and balance, while Aquatic Tai Chi may offer an alternative for people who are unable or not suitable for VR gait training.