In absolute terms, no. Men produce more force in the legs than women at every age from childhood onward. But the story is more interesting than a flat “no” suggests, because the gap in lower-body strength is dramatically smaller than the gap in upper-body strength, and once you factor in lean body mass, some measures of leg strength equalize completely. Women also show real advantages in muscular fatigue resistance and fat oxidation during exercise, meaning the answer depends on what kind of “strength” you’re asking about.
The Gap Is Real but Smaller Than Most People Think
A meta-analysis of children and adolescents found that by ages 14 to 17, boys were about 50% stronger than girls in upper-limb tasks but only about 30% stronger in lower-limb tasks. That pattern holds into adulthood: the sex difference in leg strength is roughly half the size of the difference in arm and shoulder strength.1PubMed Central. Sex Differences in Upper- and Lower-Limb Muscle Strength in Children and Adolescents: A Meta-Analysis A study of university students confirmed the same hierarchy, finding that women’s overall strength corresponded to over 50% of men’s, while their lean mass was about 55% of men’s.2PubMed Central. Sex differences in upper and lower strength and their association with body composition among university students
The reason the legs are closer to parity comes down partly to how bodies are proportioned. Women tend to carry a larger share of their total muscle mass in the lower body compared to men, who carry proportionally more in the upper body. So while men still have bigger legs in absolute terms, the relative distribution favors women’s lower half more than their upper half.
When You Correct for Lean Mass, the Difference Can Vanish
Here is where the question gets genuinely complicated. A study comparing male and female athletes on exercises like the squat and deadlift found no significant difference in performance after adjusting for lean body mass. The same was true for countermovement jump power.3PubMed Central. A Comparison between Male and Female Athletes in Relative Strength and Power Performances In other words, a kilogram of trained female leg muscle and a kilogram of trained male leg muscle produced roughly equivalent force.
This finding does not mean men and women are equally strong in any practical sense. Men typically have more lean mass to work with, so their absolute output remains higher. But it does suggest that the intrinsic force-generating capacity of muscle tissue is similar between sexes. The difference in real-world strength is largely a difference in how much contractile tissue each person carries, not in the quality of that tissue.
Different Fiber Types Tell a Different Story
Male and female skeletal muscle is not built from the same blueprint, even when the total amount is equal. A systematic review and meta-analysis of muscle fiber types found that men have a higher proportion of type II (fast-twitch) fibers, while women have a higher proportion of type I (slow-twitch) fibers. Men also had larger fiber cross-sectional areas across the board, but the type II advantage was especially pronounced: the average type II fiber area in men was roughly 5,270 square micrometers, compared to about 3,480 in women.4PubMed Central. Sex differences in human skeletal muscle fiber types and the influence of age, physical activity, and muscle group: A systematic review and meta-analysis A separate meta-analysis reinforced this, showing that men had greater distribution and area percentages for type II fibers, while women had greater type I distribution and area percentages.5PubMed. Sex differences in skeletal muscle fiber types: A meta-analysis
Type II fibers are the ones that generate explosive, high-force contractions, the kind that matter for sprinting, jumping, and heavy lifting. Type I fibers contract more slowly but resist fatigue far better. This means men have a structural advantage for peak power, while women have a structural advantage for sustained effort. Whether “stronger” means “can produce the biggest single burst of force” or “can keep working longer before giving out” changes who comes out ahead.
Women Fatigue More Slowly
The fatigue-resistance advantage for women is well documented and isn’t just about motivation or pacing. When researchers used electrical stimulation to bypass any psychological factors and directly compared how much force the quadriceps lost over repeated contractions, women’s muscles still held up better. The torque dropped less in women than men, and the difference persisted even when blood flow to the leg was cut off, ruling out superior oxygen delivery as the explanation.6PubMed. Sex differences in contractile properties and fatigue resistance of human skeletal muscle The researchers concluded the difference was likely tied to fiber type composition rather than muscle size or blood flow.
The fatigue picture is not uniform across the body, though. One study found that women were significantly more fatigue-resistant during elbow flexion, sustaining contractions for about 112 seconds versus men’s 80 seconds. But for ankle dorsiflexion, the difference disappeared.7PubMed Central. Sex Differences in Fatigue Resistance Are Muscle Group Dependent This matters for leg strength because the leg contains a mix of muscle groups with different fiber compositions. The quadriceps and calves already have a relatively high proportion of slow-twitch fibers in both sexes, which may compress the fatigue advantage women hold in faster-twitch upper-body muscles.
Recovery from fatiguing leg exercise also shows some sex-related patterns. Research comparing dynamic contractions in arms and legs found that while power decline was similar between men and women for both muscle groups, men experienced greater reductions in knee extensor force and muscle activation than women did.8PubMed Central. Fatigue and recovery from dynamic contractions in men and women differ for arm and leg muscles So even in the legs, where the baseline fatigue gap is smaller, women may bounce back to full capacity a bit more efficiently.
How Women’s Muscles Burn Fuel
Beyond fiber type, there are metabolic differences that affect how leg muscles perform during prolonged activity. Women’s skeletal muscle contains significantly higher levels of key fat-burning enzymes. One study found that women had roughly 2.5 times the protein content of one major fat-oxidation enzyme and 2.6 times the content of another, compared to men.9PLoS ONE. Women Have Higher Protein Content of β-Oxidation Enzymes in Skeletal Muscle than Men These enzymes break down fatty acids into usable energy.
The practical result: during aerobic exercise, women tend to burn a higher proportion of fat relative to carbohydrate. Research on obese men and postmenopausal women found that fat oxidation adjusted for fat-free mass was significantly higher in women during exercise, and this did not depend on circulating estrogen levels.10PubMed. Sex differences in substrate oxidation during aerobic exercise in obese men and postmenopausal obese women For the legs specifically, this metabolic profile supports sustained, lower-intensity work, the kind of effort involved in long-distance walking, hiking, cycling, and endurance running. It’s an advantage that doesn’t show up on a one-rep-max test but matters enormously in daily life and many sports.
Neuromuscular Wiring Differs Too
The way the nervous system recruits muscle fibers is not identical between sexes. A study using high-density electromyography found that during submaximal contractions, women had higher motor unit discharge rates than men and higher recruitment thresholds. Interestingly, about half of women’s motor units were recruited two or more seconds after the target force had already been reached, compared to only about 11% in men.11PubMed Central. Sex differences in the detection of motor unit action potentials identified using high-density surface electromyography This suggests women recruit motor units in a more staggered pattern, which may contribute to their fatigue resistance by rotating which fibers bear the load.
These differences seem to exist mainly in younger and middle-aged adults. A study examining motor unit behavior across the lifespan found that in young and middle-aged groups, women showed higher firing rates and greater variability than men, but by old age, the sex differences in motor unit behavior had disappeared.12bioRxiv. Motor unit behaviour adaptations across the lifespan: sex differences in young, middle-aged and old adults During explosive efforts like rapid ankle dorsiflexion, however, no sex difference in motor unit discharge rate was found, which aligns with the idea that the female neuromuscular advantage is specific to sustained rather than ballistic contractions.13PubMed Central. No Differences in Motor Units Discharge Rate Between Females and Males in Explosive Ankle Dorsiflexions
The Menstrual Cycle’s Effect on Leg Strength
For women, leg strength is not a fixed number from week to week. Hormonal fluctuations across the menstrual cycle appear to influence how much force muscles can produce. A meta-analysis found that the early follicular phase, right around menstruation, is the least favorable window for maximal strength, while the late follicular phase and ovulation are associated with peak performance. The effects were moderate for isometric strength and smaller for dynamic strength like squats.14PubMed Central. The Influence of Menstrual Cycle Phases on Maximal Strength Performance in Healthy Female Adults: A Systematic Review with Meta-Analysis
Research on athletes also found that leg muscle strength was significantly higher before and after menses compared to during menses, reinforcing the idea that hormonal shifts matter for training and competition timing.15Jurnal Sains Sukan & Pendidikan Jasmani. The effects of plyometric and hill training on leg muscle strength among athletes across different phases of the menstrual cycle That said, a narrative review of the broader literature cautioned that studies examining objective performance have not reported clear, consistent effects of cycle phase.16PubMed Central. The Impact of Menstrual Cycle Phase on Athletes’ Performance: A Narrative Review The cycle probably matters, but the effect size is small enough that it gets swamped by day-to-day variation in sleep, nutrition, and training load. For most women, it’s worth being aware of but not worth restructuring a training program around.
Structural and Biomechanical Differences
Women’s legs are not just scaled-down versions of men’s. The Q-angle, the angle formed by the quadriceps muscle line of pull relative to the kneecap, is typically larger in women due to wider hips. Research has found a negative correlation between Q-angle and quadriceps strength: a larger angle alters the pull of the quadriceps, reduces patellar stability, and decreases efficient force transmission through the knee.17International Journal of Medical and Pharmaceutical Research. Correlation of Q-angle with Muscle Strength and Balance Parameters This means that even if a woman has the same muscle mass as a man, her knee geometry may translate less of that muscle force into functional movement like kicking or jumping.
Muscle architecture itself also differs. An imaging study of lower-extremity muscles found that men had greater muscle thickness in every leg muscle examined, with differences ranging from small to substantial depending on the muscle. However, fascicle length, the length of individual muscle fibers, did not differ between sexes. Men did show wider pennation angles in several muscles, meaning their fibers packed more densely into the available space.18Nature / Scientific Reports. The relationship between muscle thickness and pennation angle is mediated by fascicle length in the muscles of the lower extremities Wider pennation angles allow more fibers to attach along a tendon, which increases force production at the cost of contraction speed, another reason men tend to outperform on peak-force tests.
Leg stiffness during dynamic activities like hopping also appears to differ, but the difference is largely explained by body mass. One study found that women demonstrated lower vertical leg stiffness than men during two-legged hopping, yet after normalizing for body mass, the difference vanished.19PubMed Central. Gender differences in leg stiffness and stiffness recruitment strategy during two-legged hopping This is a recurring theme: many apparent sex differences in leg function turn out to be size differences in disguise.
How Aging Reshapes the Comparison
The strength gap between men and women doesn’t stay constant across a lifetime. Age-related muscle loss (sarcopenia) hits the legs harder than the arms and affects both sexes, but the trajectory differs. A Japanese population study found that upper-leg muscle loss showed an age-related pattern in both sexes, but women experienced higher prevalence of site-specific upper-leg muscle loss at every age bracket examined: about 15% of women in their 30s already showed signs compared to 6% of men, and by the 70s the figures were 50% versus 38%.20PubMed Central. Age-related site-specific muscle wasting of upper and lower extremities and trunk in Japanese men and women
Leg power, which combines strength and speed, begins declining after age 40 in both sexes. But one large study found that women showed an attenuation of the power decline above age 75, meaning the rate of loss slowed in very old women compared to men of the same age.21PubMed. Age- and Sex-Specific Changes in Lower-Limb Muscle Power Throughout the Lifespan The mechanisms for this late-life leveling are not fully understood, but the net effect is that the absolute strength gap between elderly men and women is smaller than the gap in middle age. Whether that counts as women “catching up” or men declining faster is a matter of framing, but the practical result is that by late life, differences in leg function are more about individual fitness history than sex.
Tendons Respond Differently to Training
Muscles do not operate in isolation; the tendons that anchor them to bone also determine how much force reaches the skeleton. A study of older adults undergoing resistance training found a stark sex difference in tendon adaptation. Men’s patellar tendon stiffness increased by about 80% after training, while women’s increased by only about 13%.22PubMed Central. The magnitude and character of resistance-training-induced increase in tendon stiffness at old age is gender specific The study also found that the force level at which the greatest tendon adaptations occurred was different: women’s tendons responded more at lower force levels, while men’s tendons adapted most at higher forces. The researchers proposed that hormonal differences, potentially the post-menopausal estrogen environment, played a role in limiting tendon remodeling in older women.
This has implications for training design. If women’s tendons are less responsive to heavy loading in older age, programs that emphasize higher-repetition, moderate-load work may be more effective for building functional stiffness than programs built around heavy singles and doubles. It also means that older women may need to be more deliberate about tendon-loading protocols to maintain the spring-like qualities that make walking, stair climbing, and balance recovery effective.
The ACL Question and Hamstring-Quad Balance
One of the most visible sex differences in leg function is ACL injury rate. Women tear the anterior cruciate ligament at several times the rate men do in sports like soccer and basketball. Part of the explanation involves how strength is distributed between the quadriceps and hamstrings. A study of female athletes found that those who went on to suffer ACL injuries had about 15% less hamstring strength compared to matched male controls, while their quadriceps strength was not significantly different from those males. By contrast, female athletes who did not get injured had lower quadriceps strength but comparable hamstring strength relative to male controls.23PubMed Central. The Relationship of Hamstrings and Quadriceps Strength to Anterior Cruciate Ligament Injury in Female Athletes
The implication is somewhat counterintuitive: having strong quads without correspondingly strong hamstrings may actually be a risk factor for ACL tears. The hamstrings act as a co-stabilizer for the knee, pulling the tibia backward and resisting the forward shear that stresses the ACL. When hamstring strength lags behind quad strength, the knee is less protected during cutting and landing movements. Research comparing female athletes with previous ACL reconstruction, previous hamstring injury, and healthy controls found that both injured groups had lower absolute strength than controls, but the ratio between hamstring and quadriceps strength was not significantly different across groups.24PubMed Central. Hamstring-to-Quadriceps Ratio in Female Athletes with a Previous Hamstring Injury, Anterior Cruciate Ligament Reconstruction, and Controls This suggests that absolute strength, not just the ratio, matters for injury prevention, and that targeted hamstring strengthening may be more useful than fixating on ratio numbers.
What Prehistoric Bones Suggest About Women’s Legs
An intriguing piece of the puzzle comes from archaeology. Analysis of prehistoric women’s bones from Central Europe showed that their tibial (shinbone) rigidity across thousands of years of agriculture was highly variable but on average not much different from modern sedentary women, and significantly lower than modern female runners or football players. The heaviest loading in prehistoric women was concentrated in the upper body, where their arm bone rigidity actually exceeded that of living semi-elite rowers for the first 5,500 years of farming.25PubMed Central. Prehistoric women’s manual labor exceeded that of athletes through the first 5500 years of farming in Central Europe
The takeaway is that in our evolutionary and agricultural past, women’s physical demands loaded the arms far more than the legs, while men’s activity patterns, involving more walking and running for hunting and herding, loaded the legs more heavily. This does not mean women’s legs are inherently weak, but it suggests that the modern expectation of equal lower-body development between sexes may not match the activity patterns that shaped our anatomy over thousands of years. Women’s legs are built for endurance and efficiency rather than peak explosive output, and the research on fiber types, metabolism, and fatigue resistance lines up neatly with that interpretation.