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SCIENCE
Walking is networking

Physiology of human gait and postural control: an overview

Author
Jakob Tiebel
Health Business Consultant
Human bipedal locomotion – walking, in short – is governed by a complex interplay between multiple levels of the nervous system. Central pattern generators located in the spinal cord produce fundamental rhythmic movement patterns. The brainstem and cerebellum regulate and stabilise this activity. The cortex intervenes to a greater extent when movements need to be planned or adapted to novel situations. At the same time, the visual system, vestibular apparatus and proprioceptive system continuously supply sensory information regarding the body’s position and movement (Takakusaki 2013).

Ageing processes and neurological disorders can compromise this finely tuned interplay. Walking then frequently becomes slower, more irregular and less stable. This, in turn, increases the risk of falls (Montero-Odasso et al. 2012).

The following article describes how walking is modelled and controlled within the nervous system, what changes occur with ageing and disease, and the resulting implications for rehabilitation. It builds on the article “Physiology of walking and postural control”, published in Neurologie & Rehabilitation 2024/02, supplementing its arguments with additional primary and review literature, together with a further translation into clinical practice.
Introduction
Walking appears effortless, yet it requires bones, joints and muscles to work in concert with peripheral sensory receptors and the entire neuraxis, from the spinal cord to the prefrontal cortex. For this reason, gait patterns provide a wealth of information regarding an individual’s overall health and functional status.

Gait speed is of particular relevance. It is regarded as an important marker of functional independence in older adults. Individuals who consistently walk at a speed of less than approximately 0.6 metres per second frequently require assistance. At speeds above 1.0 metres per second, on the other hand, functional independence is generally significantly greater. A decrease of just 0.1 metres per second is already associated with an increased risk of falls, disability and mortality (Kyrdalen et al. 2018; Davey et al. 2025).

Falls can be understood as a clinical manifestation of inadequate gait and balance control. They demonstrate particularly clearly what happens when the coordination between the functional systems involved is no longer reliable.

More than a third of community-dwelling adults aged over 65 experience at least one fall within a year. In residential care settings, the proportion is even higher (Verghese et al. 2009). Vertigo, balance and coordination disorders are among the leading causes, and their sequelae – fractures, immobilisation, fear of falling – account for a considerable proportion of healthcare expenditure in high-income countries.

Understanding the physiology of walking is therefore not merely a fundamental neuroscientific challenge, but also a public health priority, and one of considerable significance for prevention and rehabilitation.
Significance of central pattern generators
The rhythmic alternation between flexor and extensor musculature during walking is generated by spinal interneuronal networks, referred to as central pattern generators (CPGs) (Takakusaki 2013). A substantial component of gait is therefore already organised at spinal cord level.

Animal studies have shown that such networks can generate locomotion-like movement patterns even without direct control from the brain. Findings from spinal cord stimulation and neuromodulation studies in individuals with spinal cord injury suggest that the human spinal cord possesses comparable mechanisms (Minassian et al. 2017).

The CPGs can therefore be understood as a kind of basic motor driving locomotion. They provide the rhythm. This rhythm, however, does not operate independently of the environment. Sensory information from muscles, joints, skin and the sole of the foot continuously influences it. This allows the nervous system to detect, for example, when a foot makes contact with the ground or the degree of load-bearing through a given leg. Step timing is adjusted accordingly (Takakusaki 2013).

The coordination between the arms and legs is likewise linked to these mechanisms. The characteristic automatic arm swing when walking is thus part of a broader rhythmic coordination system (Minassian et al. 2017). By contrast, higher centres in the brain determine factors such as speed, direction and adaptation to the situation at hand.
Supraspinal control of locomotion
Above the level of the spinal cord, the brainstem and cerebellum perform key functions. One important region in this context is the mesencephalic locomotor region. It is involved in initiating gait and regulating its speed. Certain neurons promote locomotion, whilst others can inhibit or halt it (Ryczko 2022). The diencephalon and cerebellum contain further regions that work in conjunction with this system. Together, they ensure that locomotion can be initiated, sustained and adapted to the situation at hand (Jahn et al. 2008).

It is noteworthy that automated gait requires comparatively little cortical control. Studies using functional imaging and near-infrared spectroscopy show that certain sensory areas of the cortex are, in fact, less active during steady-state gait. This reduced activity is thought to protect the automated movement pattern from unnecessary interference (Jahn et al. 2008).

The cerebellum is also involved in walking. It performs several tasks at the same time. It stabilises the movement rhythm, processes information from the vestibular system and coordinates the movements of different joints. It also plays a key role in motor learning and in adapting gait to new demands (Morton & Bastian 2004; Schniepp et al. 2017; Ilg & Timmann 2013).

Damage to the cerebellum therefore frequently results in a characteristic ataxic gait. A wide standing and walking base, marked step-to-step variability and impaired coordination of joint movements are characteristic features (Serrao et al. 2018; Cabaraux et al. 2022).
Cortical modulation and the locomotor network
So, as long as we are walking on familiar terrain at a steady pace, a large proportion of the movements required occur automatically. As soon as the situation changes and becomes more complex, however, the demand for cortical control increases. This applies, for example, to gait initiation, stopping, turning, negotiating obstacles or walking on unfamiliar surfaces. Frontal and parietal brain regions become particularly active in these situations (Takakusaki 2013).

The supplementary motor area, for example, prepares postural adjustments. The premotor cortex plans movement sequences. Parietal and temporal regions process information about the position of the body in space. These adjustments are then integrated into the ongoing movement pattern via connections to the brainstem. The basal ganglia and cerebellum support this process.

This cortically distributed organisation explains why neurological disorders can impair walking in very different ways. In Parkinson’s disease, Alzheimer’s disease or cerebral microangiopathy, different structures and networks are affected in each case. However, these changes all share a fundamental adaptive mechanism. The less reliably the automated components of gait control operate, the more forcefully the nervous system attempts to shift control to higher cortical levels. As a result, walking becomes less automatic and increasingly requires conscious monitoring and control.

This additional cortical control can initially help to compensate for instability and maintain stability during walking. However, it does have its limitations. Attention and cognitive processing capacity are limited. The more walking depends on this, the more vulnerable it becomes to additional demands such as conversation, orientation, obstacles, or changes of direction. What largely occurs incidentally in a healthy individual increasingly becomes a conscious task.

This shift from automated to more cortically controlled locomotion is a common feature of many neurological gait disorders (Montero-Odasso et al. 2012; Roytman et al. 2024).
Sensory integration for balance and gait
The increasing cortical control can, however, only function if the nervous system receives reliable information about body position, movement and the environment. Gait control therefore always has a sensory component. This is particularly evident when it comes to balance: the upright stance is biomechanically unstable. Even minor deviations can cause the body to move further out of the vertical under the influence of gravity. The nervous system must therefore continuously monitor the body’s position in space and intervene with corrective action as required.

For this, it primarily draws on three sources of information: proprioception via muscles, joints and skin, the visual system, and the vestibular system in the inner ear. From these signals, the nervous system continuously generates as reliable a picture as possible of how the body is aligned and moving. On this basis, appropriate muscular responses are triggered to maintain posture and balance (Peterka 2018).

Crucially, the brain flexibly weights these three sources of sensory information. Where visual information becomes unreliable, the brain relies more heavily on proprioceptive or vestibular signals. Conversely, where proprioceptive input is impaired, visual and vestibular information becomes more significant. This continuous adjustment is referred to as sensory reweighting and is a central mechanism of balance control (Peterka 2018).

Somatosensory information is derived, among other sources, from the plantar surface of the foot, the ankle joints, muscle spindles and joint receptors. This information is available particularly rapidly and is therefore important for immediate reactions to perturbations. This information may be diminished in the presence of peripheral neuropathy. As a result, affected individuals may respond too late to a slip or unexpected contact and fall more frequently (Richardson & Ashton-Miller 1996; Kohle et al. 2024).

The vestibular system provides information about the position of the head in relation to gravity and about head movements. It plays a key role in postural alignment and gaze stabilisation during movement. With bilateral loss, the visual surroundings may appear to blur or jump during walking. At the same time, standing and gait stability decrease markedly, particularly when visual orientation is also impaired (Schniepp et al. 2017).

Visual information helps in assessing how the body moves relative to its surrounding environment. One important cue in this context is the so-called optic flow. As we move forwards, the entire visual field changes in a characteristic manner. This information is slower than somatosensory signals but becomes particularly important when other sensory systems are unreliable (Peterka 2018).

In healthy people, the three systems can, to some extent, compensate for one another. Good proprioceptive awareness, for example, can compensate for impaired vision. Difficulties arise primarily when several systems are impaired simultaneously. And this becomes more common with increasing age (Roytman et al. 2024).
Gait speed, variability and falls
The extent to which these individual functional domains interact can, to a certain degree, be directly assessed through observation of the gait pattern. Two parameters are particularly significant in this respect: gait speed and gait variability. Gait speed describes how quickly a person moves. Gait variability, by contrast, reflects the extent to which individual steps differ from one another.

Gait speed reflects the interplay of many contributing factors. These include cardiovascular capacity, muscle strength, joint mobility and neuronal control. From age 60, it decreases on average by approximately one per cent per year. Reduced gait speed is associated with a higher risk of disability, falls and mortality, independent of comorbidities and frailty (Kyrdalen et al. 2018; Davey et al. 2025).

Gait variability adds a further important dimension to this picture. It describes, for instance, the extent to which step duration or step length fluctuate from one step to the next. High variability indicates that the underlying movement rhythm is less stable. In a prospective study, step-time variability in older adults who subsequently experienced falls was more than twice as high as in those who did not go on to fall. In this study, variability predicted future falls more accurately than gait speed alone (Hausdorff et al. 2001). Comparable associations have also been described in other cohorts (Verghese et al. 2009; Hausdorff et al. 1997).

Both parameters are nevertheless closely linked to the degree of automaticity of gait. Very slow walking requires more continuous sensory and cortical control and may therefore be more susceptible to perturbations than more highly automated walking at a faster pace (Schniepp et al. 2017). This is exactly where it becomes clear that gait stability is not a question of strength and balance alone. It also depends significantly on the extent of cognitive resources the nervous system must allocate to the control of gait.
Effective neurorehabilitation trains not only muscles, but the entire sensorimotor network.
Walking requires attention
The less automated walking becomes, the more consciously the brain must monitor and adjust the movement. This requires attention. This relationship becomes particularly evident when a secondary task must be performed simultaneously with walking. A classic example is walking whilst counting backwards. In healthy older adults, gait pattern typically changes only slightly under these conditions. In people with mild cognitive impairment or early neurodegeneration, however, walking can slow considerably more markedly.

These additional decrements are referred to as dual-task costs. In the Gait and Brain Cohort of 112 older adults with mild cognitive impairment, high dual-task cost during backward counting was associated with a significantly increased risk of developing dementia within the subsequent six years. By contrast, gait speed during single-task walking was not predictive (Montero-Odasso et al. 2017).

The link between movement and cognition is also evident at population level. In the Honolulu-Asia Aging Study, men with a very low daily walking distance developed dementia more frequently than men who regularly covered greater distances (Montero-Odasso et al. 2012). Dual-task tests can therefore reveal the extent to which an individual relies on conscious control and how well walking and additional cognitive demands can be managed simultaneously. Such tests capture an aspect of gait control that may otherwise remain concealed during simple straight-line walking (Verghese & Holtzer 2010; Montero-Odasso et al. 2012).

Yet cognitive demands are not the only factor capable of challenging these limited resources. Emotional factors, too, alter the extent to which an individual consciously controls their gait. This is particularly evident in the fear of falling.
Fear also alters gait
Fear of falling affects walking not only psychologically but also directly via motor control mechanisms. Individuals who feel unsteady tend to monitor and control their own movement more closely. Walking consequently often becomes slower, more cautious and less automatic.

Fear of falling is common among older adults with gait disorders. It is associated with a slower and, in some cases, more variable gait pattern. This association persists even after statistically accounting for physical impairments (Vellas et al. 1997; Ayoubi et al. 2015).

A meta-analysis demonstrated moderately increased gait variability in older adults with fear of falling. However, other studies suggest that part of these differences arises because affected individuals consciously choose to walk more slowly. The slower pace is not necessarily indicative of an additional loss of control. It may also initially represent a sensible protective strategy, through which the nervous system seeks to gain greater control and security (Reelick et al. 2009).

This strategy becomes problematic when caution develops into persistent avoidance behaviour. A fear-driven reduction in walking results in diminished functional capacity, reduced movement experience and a loss of confidence in one’s own mobility. This can further exacerbate the underlying instability. Multicomponent exercise programmes combined with cognitive-behavioural therapeutic approaches can help interrupt this cycle, at least temporarily.
What does this mean for rehabilitation?
This highlights a key point in rehabilitation. Safe gait does not arise from a single mechanism alone. Rhythm, strength, sensory processing, balance, attention and emotional security are in constant interplay. Training should therefore address more than just one of these domains.

Evidence-based gait rehabilitation must integrate the various levels of motor control. Repeating numerous steps forms an important foundation for this, but is not sufficient on its own. Rhythmic repetition specifically engages the automated and spinal components of locomotion. In everyday life, however, gait has to be continuously adapted. People need to start and stop, change direction, manage varying speeds, react to perturbations, and simultaneously perceive their environment or carry out other tasks.

A comprehensive training regime should therefore systematically incorporate such demands. This includes changes in pace and direction, varying surfaces, perturbations and dual-task activities. Very slow gait can also be purposefully used, as sensory and postural deficits may become more clearly apparent than during more automated walking patterns (Montero-Odasso et al. 2012; Ilg & Timmann 2013; Schniepp et al. 2017).

The practical challenge lies in delivering these varied training stimuli safely, with sufficient intensity and as much frequency as possible. This is precisely where device-based methods can play an important role.
Opportunities in device-assisted gait rehabilitation
Device-assisted gait rehabilitation should therefore accomplish more than simply repeating a predefined movement pattern. Its potential lies in enabling targeted, precisely dosed training of the various components of locomotion. This includes movement rhythm, physical exercise tolerance, postural control, sensory information processing, task-specific gait training and adaptation to additional cognitive demands.

Simple step repetition, once the initial phase of gait rehabilitation has been completed, falls short if balance, attention and adaptability are not also taken into account. Conversely, general strength or endurance training alone is insufficient to relearn gait. What matters most is combining these training methods in a way that addresses each patient’s specific impairments and therapeutic goals.
The THERA-Trainer complete solution
The THERA-Trainer product ranges can be understood as a coordinated, yet non-linear, training continuum. Depending on the patient’s mobility level, therapeutic goal, exercise tolerance and safety requirements, different forms of training can be employed individually or in combination. What matters here is not the device alone, but rather the training method and the physiological mechanism specifically targeted.
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Conclusion
Gait is generated through the interplay of multiple levels of the nervous system. Spinal networks generate fundamental rhythmic movement patterns. The brainstem and cerebellum regulate and stabilise these patterns. The cortex intervenes to a greater extent when movements need to be planned, adapted or controlled under difficult conditions. At the same time, visual, vestibular and somatosensory information provides continuous feedback about the body and environment.

Age and neurological disorders can affect any of these levels. Despite differing underlying causes, a common pattern frequently emerges: The less reliably the automated gait control mechanism functions, the more the nervous system attempts to safeguard stability through additional cortical control. As a result, gait becomes more consciously controlled, cognitively more demanding and more vulnerable to additional task demands.

Gait speed, gait variability and dual-task performance make different aspects of these changes visible. This gives rise to a principle for rehabilitation that is both simple and crucial: gait cannot be reduced to stepping movements alone. Successful training must integrate rhythmic activation, physical exercise tolerance, postural control, sensory integration, task-specific gait training and cognitive-motor adaptability.

The THERA-Trainer training continuum can address these varying requirements across different functional levels. Cycling generates movement and builds load tolerance. Standing & Balancing develops control against gravity and progressively integrates sensory and cognitive-motor demands. Gait translates these capabilities into a large number of specific steps and, ultimately, into variable, everyday walking.

The therapeutic principle remains the decisive factor throughout: technology supports rehabilitation effectively when it enables the physiological demands of a specific task to be trained in a targeted way.
Author
Jakob Tiebel
Health Business Consultant
Jakob Tiebel is OT and studied applied psychology with a focus on health economics. He has clinical expertise from his previous therapeutic work in neurorehabilitation. He conducts research and publishes on the theory-practice transfer in neurorehabilitation and is the owner of an agency for digital health marketing.
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