Double support time is the portion of each walking stride when both feet are touching the ground at once, and it increases steadily as people get older. In a healthy young adult, double support accounts for roughly 20% of the gait cycle. Toddlers just learning to walk may spend more than 40% of their stride in double support, and adults over 76 show measurably longer double support periods than those in their fifties or sixties. The change is not random; it reflects a shifting balance between stability, strength, sensory input, and the brain’s ability to coordinate movement.
What Happens During Double Support
Walking is essentially a controlled series of falls. Each step requires you to shift your weight forward over one leg, briefly becoming less stable, before the other foot lands and catches you. Double support is the brief window when both feet share the load. During this phase, your center of mass sits between two points of contact with the ground, which is inherently more stable than the single-leg phase that makes up the rest of the stride. Because humans have more control over their center of mass during double support, adjusting its duration is one of the easiest ways the body can fine-tune walking stability.1PubMed Central. Gait modification when decreasing double support percentage
In comfortable walking, double support occupies about 20% of the total gait cycle, split between two brief moments: one at the beginning of a step (when the lead foot lands while the trailing foot is still down) and one at the end (when the trailing foot pushes off as the lead foot takes over). Speeding up shortens both windows; slowing down stretches them out. This relationship between speed and double support time is so consistent that researchers often need to account for it when comparing different populations, because older adults also tend to walk more slowly.
Starting Long and Shrinking Down in Childhood
Babies taking their first independent steps look nothing like adult walkers, and double support time is one of the clearest differences. Novice walkers spend roughly 42% of the stance phase in double support, compared to about 34% in toddlers with a few months of walking experience.2MDPI (Children). Biomechanical Characteristics of the Typically Developing Toddler Gait: A Narrative Review Early research found that the double support time of junior independent walkers could range anywhere from 20% to 60% of the gait cycle, depending on how new they were to the task. A wide base of support and prolonged stance duration accompany this extended double support, giving toddlers the extra ground contact time they need while their balance systems are still maturing.
Over the first few years of walking, double support time drops as children develop stronger leg muscles, better proprioception, and more refined coordination between the visual, vestibular, and somatosensory systems that keep them upright. By around age five or six, most children walk with gait patterns that look broadly adult-like. The decline in double support from infancy to early childhood is steep and rapid, driven mainly by practice and neurological maturation rather than any conscious effort.
The Gradual Climb After Midlife
After decades of relatively stable gait, double support time begins to creep upward again. The increase is not sudden. A study comparing adults aged 51 to 65, 66 to 75, and over 76 found that double support time was already moderately longer in the 66-to-75 group compared with the youngest group under baseline walking conditions. In the over-76 group, the increase was even larger and reached statistical significance across all walking conditions tested, with a large effect size.3PubMed Central. Gait Characteristics during Dual-Task Walking in Elderly Subjects of Different Ages Research on Japanese community-dwelling adults similarly found that age-related changes in most gait variables, including double support, became pronounced in the 70-to-84 age range during comfortable walking.4PubMed. Spatiotemporal components of the 3-D gait analysis of community-dwelling middle-aged and elderly Japanese: age- and sex-related differences
The pattern holds up across different study populations and stepping tasks. In a study of elderly participants performing various stepping movements, older age groups consistently showed longer double support times, while younger age groups were able to take more steps in the same timeframe.5PubMed. Age and sex differences in various stepping movements of the elderly The general picture is clear: from roughly the seventh decade onward, walking involves spending more and more time with both feet on the ground.
Why the Body Extends Double Support With Age
The increase is not a failure of the walking system so much as a deliberate recalibration. A literature review of gait changes in able-bodied older adults concluded that the progression toward shorter steps, slower walking, wider step width, and prolonged double support may emerge as a compensatory strategy aimed at increasing stability, avoiding falls, or reducing the energetic cost of mobility.6Aging Clinical and Experimental Research. The effect of aging on gait parameters in able-bodied older subjects: a literature review In other words, the nervous system detects that the margin of safety during single-leg support is shrinking and responds by spending more time in the more stable two-footed phase.
Several age-related changes drive this recalibration. Muscle strength in the legs declines, especially in the ankle plantar flexors that push off the ground during late stance. Sensory systems become less reliable: vision may be less sharp, the vestibular system in the inner ear responds more slowly, and receptors in the joints and skin of the feet lose sensitivity. A study of dynamic balance in older adults found that reduced visual input increased the odds of a loss of balance nearly sixfold on an unstable surface, and that muscle strength and age were independent predictors of balance loss.7Oxford Academic (The Journals of Gerontology: Series A). Dynamic Balance in Older Persons: Effects of Reduced Visual and Proprioceptive Input When any of these inputs degrades, the brain’s best quick fix is to keep both feet on the ground a bit longer during each stride.
Sex Differences in Double Support Time
Aging does not affect everyone’s gait equally. Older women tend to have longer double support times than older men, even within the same age bracket. A study of Korean elderly adults found that women had more variable stride timing and longer double support on the left side compared to men. The researchers interpreted this as evidence of less efficient gait control in older women, with the increased double support serving as a stabilizing compensation for more variable stepping rhythms.8PubMed Central. Effect of Age and Sex on Gait Characteristics in the Korean Elderly People
Japanese gait data echo this pattern: at comfortable walking speeds, women had longer double support times than men, while men had greater brisk walking velocities and step lengths.4PubMed. Spatiotemporal components of the 3-D gait analysis of community-dwelling middle-aged and elderly Japanese: age- and sex-related differences These differences likely reflect a combination of factors, including smaller average stature, lower muscle mass in the lower limbs, and hormonal changes after menopause that accelerate losses in muscle and bone quality. The sex gap also complicates screening: a double support value that would be unremarkable for an older woman might flag a gait problem in an older man of the same age.
When Your Brain Is Busy, Your Feet Get Cautious
Walking feels automatic, but it actually demands a surprising amount of brain power, especially as you age. Dual-task experiments, in which people walk while doing something mentally or physically demanding at the same time, reliably show that double support time increases when the brain is occupied. The study of adults grouped by decade found that performing a combined motor and cognitive task while walking pushed double support time even higher in every age group, with the oldest participants showing the largest increases.3PubMed Central. Gait Characteristics during Dual-Task Walking in Elderly Subjects of Different Ages
This effect is not limited to healthy aging. In stroke survivors, simply talking while walking caused a significant increase in the percentage of braking double support time, along with a drop in walking speed.9Age and Ageing. Dual-task effects of talking while walking on velocity and balance following a stroke The implication is practical: if you notice an older family member slowing down and looking unsteady when they talk during a walk, it is not just distraction. Their balance system is allocating more resources to the conversation, leaving fewer resources for the fine motor control that keeps walking smooth. That shift manifests as longer double support and shorter, slower steps.
Double Support Time as a Fall Risk Marker
Clinicians and researchers have been interested in double support time partly because it predicts who is more likely to fall. A study of community-dwelling older adults found that those classified as fall-risk had significantly increased stance phase time and double support time at both preferred and faster walking speeds, along with shorter stride lengths, slower velocity, and lower cadence, compared to people not at risk of falling.10Scientific Reports. Predicting fall risk through step width variability at increased gait speed in community dwelling older adults The association makes intuitive sense: someone whose balance is compromised needs more double support to stay upright, and that same compromised balance makes falls more likely.
What makes double support time especially useful as a clinical marker is that it changes reliably and can be measured during a simple walking test. It does not require sophisticated equipment to notice. A clinician watching someone walk down a hallway can often spot prolonged double support as a shuffling quality, where the feet seem reluctant to leave the ground. Gait analysis labs can measure it precisely, but even informal observation picks up large changes.
Neurological Conditions and Double Support
Age-related gait changes are amplified in people with neurological conditions. Alzheimer’s disease offers an instructive example. A longitudinal study tracking gait in individuals with Alzheimer’s found a significant decline in gait speed and step length over time during both single-task and dual-task walking. Double support time, step width, and step height showed inconsistent results across the study period, however, suggesting that Alzheimer’s disease does not simply accelerate normal aging patterns in every gait parameter.11PubMed. A longitudinal study of gait function and characteristics of gait disturbance in individuals with Alzheimer’s disease The inconsistency is worth noting because it means double support time alone cannot tell you whether someone’s gait changes are driven by normal aging or by an underlying condition. Other parameters and clinical context matter.
Parkinson’s disease, stroke, and peripheral neuropathy all alter double support time in their own ways. People with Parkinson’s disease, for instance, often show a festinating gait where steps become very rapid and short, which can paradoxically reduce double support in some phases while making the overall gait cycle extremely unstable. Stroke survivors typically have marked asymmetry between the affected and unaffected sides, and their double support time reflects this lopsidedness. The takeaway is that while rising double support time is a normal and expected feature of healthy aging, sudden or asymmetric changes deserve clinical attention.
How Obstacles and Challenging Terrain Change the Picture
Walking on a flat, predictable surface is one thing. Add obstacles and the strategies diverge further between young and old. Older adults crossing multiple obstacles lifted their trailing foot higher over both the first and second obstacles compared to young adults, suggesting they adopt a more conservative clearance strategy to avoid tripping.12Scientific Reports. Effects of Aging on the Obstacle Negotiation Strategy while Stepping over Multiple Obstacles This exaggerated clearance comes at a cost: it requires more time in single-leg stance and tends to push the preceding approach steps into longer double support phases, as the walker pauses to plan the crossing.
Uneven ground, stairs, curbs, and cluttered environments all provoke similar adjustments. The pattern is consistent: when the environment gets harder, older adults spend proportionally more time in double support than young adults do in the same conditions. This is partly why falls so often happen outdoors on uneven surfaces or at transitions like curbs and thresholds, where the usual double support compensation may not be enough to maintain stability.
Exercise and Stretching Can Push Double Support Back Down
The age-related increase in double support time is not irreversible. Even simple interventions have measurable effects. A study of elderly women found that performing stretching exercises produced an immediate increase in gait velocity and step length along with a reduction in double support time, suggesting improved stability and mobility even from a single session of stretching.13PubMed. Transient effects of stretching exercises on gait parameters of elderly women These were transient effects, meaning they faded after the session, but they demonstrate that the musculoskeletal system still has the capacity to support a more youthful gait pattern when given the right stimulus.
For more lasting improvements, multicomponent exercise training, which combines strength work, balance drills, and aerobic activity, has been shown to improve functional capacity and gait ability in older women more effectively than strength training alone.14PubMed Central. Multicomponent Exercise Training Improves Gait Ability of Older Women Rather than Strength Training: A Randomized Controlled Trial Strength training on its own improved muscle function and dynamic balance, but the combination approach had a broader impact on the gait parameters that matter most for daily life. The distinction matters: if your goal is specifically to walk better and more safely, a varied exercise program that challenges balance and coordination alongside raw strength is the better bet.
What Assistive Devices Do to Double Support
Walking aids like canes, crutches, and walkers change double support time, but not always in the direction you might expect. A study of community-dwelling older adults found that crutch and walker users had decreased double support time when assessed with their device compared to walking unaided.15PubMed. The effect of three different types of walking aids on spatio-temporal gait parameters in community-dwelling older adults The device itself provides an extra point of contact with the ground, effectively sharing some of the stability role that double support normally fills. With that external support, the body can afford to spend less time in two-footed stance and more time in the single-leg phases that actually move you forward.
Even in healthy adults, using a walking aid altered the timing of double support phases on both sides of the body.16PubMed. Influence of a walking aid on temporal and spatial parameters of gait in healthy adults This has clinical implications for physical therapists prescribing devices: the right walking aid does not just prevent falls by providing a handhold, it actually reorganizes the gait cycle in ways that can improve efficiency and reduce the exaggerated double support that marks an unstable walker.
Measuring Double Support Time Accurately
Precise measurement of double support time matters for research and clinical use, but it turns out to be one of the trickier gait parameters to capture with portable devices. A validation study comparing a mobile gait analysis system to a laboratory instrumented treadmill found that double support duration was the most error-prone unilateral parameter, with percentage root mean square errors ranging from about 9% at slower speeds to about 14% at faster speeds.17PubMed. Accuracy of unilateral and bilateral gait assessment using a mobile gait analysis system at different walking speeds Other parameters like stride length and cadence were captured more reliably.
The reason double support is harder to measure is that it depends on correctly identifying the exact instant each foot contacts and leaves the ground. Those transitions happen quickly, and small timing errors compound because double support is calculated as the difference between two larger measurements. For clinical screening, the error margins of wearable sensors are usually acceptable, but for research purposes or when tracking small changes over time, laboratory-grade equipment offers meaningfully better accuracy. If you are monitoring your own or a family member’s gait using a consumer fitness device, keep in mind that double support values may carry more noise than step count or walking speed readings.
Brisk Walking Reveals Problems Earlier
One finding that runs through several of these studies is that challenging the gait system, whether by asking someone to walk faster, talk while walking, or navigate obstacles, reveals age-related changes earlier and more clearly than comfortable walking does. The Japanese gait study found that age-related changes appeared at a younger age during brisk walking than during comfortable walking.4PubMed. Spatiotemporal components of the 3-D gait analysis of community-dwelling middle-aged and elderly Japanese: age- and sex-related differences The fall-risk study observed that double support differences between at-risk and not-at-risk groups persisted at both preferred and faster speeds.10Scientific Reports. Predicting fall risk through step width variability at increased gait speed in community dwelling older adults
This has a practical application: if you want to know whether your gait is aging faster than the rest of you, ask yourself how confident you feel walking quickly. Comfortable-pace walking gives the nervous system plenty of room to compensate. Faster walking narrows the margin, forcing the body to either manage with less double support or slow down. A person who feels fine at a stroll but uneasy picking up the pace may already have balance changes that double support time would quantify. Some physical therapists use this principle explicitly, testing patients at faster-than-comfortable speeds to unmask deficits that do not show up during casual walking.
The Evolutionary Context of Two-Footed Contact
Double support is not just a clinical measurement; it is a defining feature of how humans walk compared to other primates. Research comparing bipedal walking in chimpanzees and humans used high-speed motion capture to analyze foot kinematics at similar speeds, examining what happens during both double-limb and single-limb support periods.18Journal of Human Evolution. Chimpanzee and human midfoot motion during bipedal walking and the evolution of the longitudinal arch of the foot The human foot’s longitudinal arch, which stiffens during push-off, allows for a clean transfer of force during the transition from double to single support. Chimpanzees, with their more flexible midfoot joints, exhibit different motion patterns during these same phases. The arch essentially makes human double support more mechanically efficient, which may be one reason our species can walk long distances with relatively low energy cost.
Understanding this evolutionary backdrop puts the age-related changes in perspective. The human gait cycle is finely tuned, and double support time sits at the intersection of balance, energy efficiency, and forward propulsion. When aging degrades any of these systems, double support is one of the first parameters to shift, precisely because it is the easiest lever the body can pull to buy more stability without fundamentally changing the walking pattern.