Men do tend to show more postural sway during quiet standing than women, and the primary reason is straightforward physics: men carry their center of mass significantly higher in their bodies. Women’s center of gravity sits roughly 8 to 15% lower relative to their total height, which gives them a natural stability advantage in many everyday situations. But the full picture involves more than just where your weight sits. Differences in joint structure, proprioception, and age-related muscle loss all play a role.
Center of Mass Is the Biggest Factor
The single most important variable in standing balance is how high your center of mass sits above your base of support. Men typically carry more of their mass in the upper body, particularly the shoulders and torso, which pushes their center of gravity higher. Women distribute proportionally more mass around the hips and thighs, pulling that center point downward. Think of the difference between a tall, top-heavy bookshelf and a squat, wide dresser. The dresser is harder to tip.
This difference is large enough to have real physiological consequences. Research published in Theoretical Biology and Medical Modelling found that a 15% lowering of the center of gravity was sufficient to prevent the kind of blood-pressure-driven fainting that can occur when the body struggles to keep blood flowing to the brain during upright posture. The authors noted that this anatomical difference likely evolved to help women maintain stability during pregnancy and while carrying infants, when balance demands increase dramatically.
What Postural Sway Measurements Show
When researchers measure how much a person’s body drifts while standing still on a force plate, they track what’s called center-of-pressure excursion. A study of healthy German adults found that women in their 30s swayed about 12 mm front to back and 8 mm side to side during quiet standing, with a total sway area of roughly 0.72 square centimeters. Male reference values from comparable studies were notably higher: about 17.7 mm front to back and 11.7 mm side to side. That’s roughly 50% more sway in the sagittal plane alone.
These differences show up in controlled lab settings, but it’s worth noting they don’t always translate to every balance task. On the single-leg stance test, a common clinical measure where you stand on one foot with eyes open, men and women perform almost identically. Adults aged 18 to 39 average about 43 seconds regardless of sex. The pattern holds across every age group tested, from the 40s through the 80s. A large study of 549 adults found no statistically significant gender difference in single-leg stance time at any age, suggesting that the stability gap between men and women is most pronounced during two-footed, quiet standing rather than active balance challenges.
Hip and Knee Anatomy Play a Supporting Role
Beyond center of mass, men and women differ in lower-body joint geometry in ways that influence how forces travel through the legs. Women tend to have greater hip anteversion (a slight inward twist of the thighbone), wider tibiofemoral angles at the knee, and more general joint laxity. These differences become most pronounced after puberty, with mature women maintaining roughly 4 degrees more hip anteversion than men.
Interestingly, these structural differences cut both ways. Greater joint laxity means more flexibility but potentially less passive stiffness at the ankle, which is a key stabilizing joint. On the other hand, the wider female pelvis creates a broader base of support when standing with feet at a natural width. Research from the Journal of Orthopaedic and Sports Physical Therapy found that increased hip anteversion in women can reduce the leverage of the outer hip muscles that control side-to-side stability during movement. So while women have a lower center of mass working in their favor, their joint angles create different biomechanical challenges during dynamic activities like cutting, jumping, or walking on uneven ground.
Women Have Better Proprioception
Proprioception is your body’s ability to sense where your limbs are in space without looking at them. It’s what lets you walk down stairs in the dark or catch yourself when you stumble. Research on healthy adults found that women display better lower-extremity proprioception and balance control than men, with significant differences in ankle and knee position sensing, hopping accuracy, and the strength-to-weight ratio of muscles acting at those joints.
Researchers initially suspected that the stability gap between sexes might stem from differences in how men and women use visual information to stay balanced. A study of intercollegiate athletes tested this by comparing postural sway with eyes open versus eyes closed. When visual cues were removed, both sexes showed similar percentage increases in sway. This ruled out visual reliance as the explanation, pointing instead to differences in how the somatosensory and vestibular systems process balance information. In other words, the sex difference in stability appears to be wired into how the body senses and responds to shifts in position, not just how it’s built.
Men Lose Stability Faster With Age
The gap between men and women widens as they get older, largely because men lose leg muscle mass at a faster rate. Longitudinal studies of adults in their 70s show that men lose leg lean mass at 0.80 to 0.98% per year, compared to 0.64 to 0.70% per year in women. Over a decade, that difference adds up to a meaningful loss of the strength reserves that keep you upright when you trip or step off a curb unexpectedly.
Across all ages, the median rate of muscle loss is about 0.47% per year in men and 0.37% per year in women. Because men start with more absolute muscle, they may not notice the decline as quickly, but the percentage-based erosion is steeper. Declining muscle mass also impairs the tendons and connective tissue that transmit force across joints, compounding the effect on balance. These changes in muscle, combined with age-related declines in sensory processing and reaction time, help explain why older men face higher rates of balance-related falls than their structural advantages in raw strength might suggest.
Foot Size Relative to Height
One counterintuitive finding complicates the narrative. Proportionate to their height, women actually have smaller feet than men across populations worldwide. Since foot length directly affects front-to-back stability (a longer foot creates a longer base of support), you might expect smaller relative feet to be a disadvantage. Researchers have noted this is somewhat surprising given the balance demands of pregnancy and have speculated that evolutionary pressures related to mate selection may have worked against what would be biomechanically optimal. In practice, women’s lower center of mass appears to more than compensate for this relative difference in foot length.