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Women and men have different muscle compositions, which leads to differences in strength and performance. Women typically have less muscle mass than men, with women's bodies being around 30-35% muscle by weight, while men's bodies are around 40-50% muscle by weight. These differences in muscle mass account for variations in strength and performance between genders. Women also tend to have a higher body fat percentage, which can influence strength and performance during exercise. Additionally, women have been found to have more type I muscle fibres, also known as slow-twitch muscle fibres, which are rich in blood-carrying myoglobin. While men generally have an advantage in upper and lower body strength, women exhibit greater endurance due to their neuromuscular activity, which efficiently utilises all muscle fibres.
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What You'll Learn
Muscle mass and body composition
When discussing muscle mass, it is important to distinguish between skeletal muscle, smooth muscle, and cardiac muscle. Skeletal muscle is the type of muscle that individuals can voluntarily control, such as the bicep muscle when bending the arm upward. Smooth muscle contracts autonomously, like the muscles in the digestive system, while cardiac muscle forms the main tissue of the heart's walls. Skeletal muscle is the most abundant tissue in the human body and plays a crucial role in movement, posture, and supporting various bodily functions.
The distribution of muscle mass can vary between men and women. Studies have found that women tend to have a larger proportion of their total appendicular skeletal muscle mass in their lower extremities compared to men. For example, women typically have around 40% less muscle mass than men in the upper body, while the difference in the lower body is smaller, at about 33%. These differences in muscle mass distribution contribute to the varying strength levels observed between the sexes.
Maintaining a healthy muscle mass is beneficial for several reasons. Firstly, it helps reduce the risk of age-related muscle loss, known as sarcopenia, which begins around age 30. By building and preserving muscle mass through exercise and proper nutrition, individuals can slow down muscle loss, maintain physical ability, and reduce the risk of injuries. Secondly, higher muscle mass increases metabolic rate, making it easier to burn more calories at rest. Additionally, research suggests that a higher muscle mass can offer protection against developing diabetes and prevent falls and illnesses.
Estimating muscle mass percentage can be done through various methods, including medical equipment, body fat calculations, and measuring specific body areas. While MRI scans are considered the gold standard for determining muscle mass, they are expensive and impractical for most individuals. Other methods, such as body fat scales and bioelectrical impedance analysis (BIA), can provide estimates but may not always be accurate due to factors like hydration levels and skin temperature. Therefore, it is recommended to consult a healthcare professional for guidance on assessing body composition and determining healthy muscle mass percentages.
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The role of testosterone
Women typically have less muscle mass than men, and this is often attributed to their lower testosterone levels. Testosterone is a hormone that is typically associated with men, where it is responsible for the development of male sexual characteristics, such as a deep voice, facial hair, and muscle mass. However, testosterone is also produced in smaller amounts by the ovaries in women, and it plays a crucial role in maintaining energy levels, healthy libido, mood, cognitive function, and bone density.
Testosterone therapy, including the use of testosterone shots, has been proposed as a way to address hormonal imbalances in women. By supplementing with testosterone, women can experience improved sexual desire and function. Testosterone shots can also help prevent decreased muscle mass and improve mood and bone density. Women can also maintain healthy testosterone levels through lifestyle choices such as regular exercise, which can help boost testosterone levels and maintain a healthy weight.
The relationship between testosterone levels and muscle mass is complex. While testosterone does play a role in muscle development, other growth factors like IGF-1 and growth hormone also contribute. Women produce similar amounts of IGF-1 as men and even three times as much growth hormone. This partly explains why women can still develop muscle mass despite having lower testosterone levels.
In addition, the effect of testosterone on muscle mass may be less direct in women compared to men. Studies suggest that testosterone functions differently in men and women. In women, testosterone may act through aromatisation to oestradiol, which then mediates its physiological actions in the body. This means that the role of testosterone in women's muscle development may be more indirect, with other hormones playing a more direct role.
While testosterone levels are important, they are not the sole determinant of muscle mass in women. Genetic factors, body composition, and training methods also play a significant role in muscle development. Women's bodies also tend to use muscle fibres differently, exhibiting greater endurance due to neuromuscular activity that efficiently utilises all the fibres.
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Muscle fibres and endurance
Women have 40% less skeletal muscle than men on the top half of their bodies, and 33% less below the waist. However, women are still 90% as fast as men, and this is due to their multi-tasking muscle fibres.
There are three types of muscle fibres: slow oxidative (SO), fast oxidative (FO), and fast glycolytic (FG). Most skeletal muscles contain all three types, but in varying proportions. SO fibres contract relatively slowly and use aerobic respiration to produce ATP. They are found in abundance in elite endurance athletes as they are specialised for long-duration contractile activities. FO and FG fibres facilitate short-duration anaerobic activities and are proportionally higher in elite strength and power athletes.
Training can increase or decrease the number of fibre types to enhance performance. For example, endurance training can increase the endurance level of fast-twitch fibres. Additionally, endurance training can bring about significant adaptations to the skeletal muscle, such as increased enzyme activity levels and mitochondrial concentrations.
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Lower-body strength
Women can build impressive lower-body strength, but men typically have more strength in their lower body. However, the difference is less pronounced than in the upper body, where men have a significant advantage due to their larger muscle fibres and higher testosterone levels, which impact protein synthesis. Women's lower-body strength is estimated to be around 66% of men's, and they can achieve about 80% of men's strength when comparing individuals of similar sizes.
The disparity in lower-body strength between the sexes is smaller than in the upper body, and this difference may be related to childbirth. Women's bodies have evolved to carry the weight of a developing baby, which requires stronger muscles, tendons, bones, and ligaments in the lower body. Additionally, women's bodies have a higher concentration of type I muscle fibres in the lower body, which means they fatigue less during long, slow contractions or longer, lighter sets. This gives them an advantage in endurance-based exercises.
Some studies have found that women's lower bodies are stronger in proportion to their upper bodies than men's. Women may also be more familiar with leg exercises, as they are often encouraged to work on their legs to achieve a certain body image. As a result, they may perform more leg presses, squats, and knee extensions in their training regimens.
It is important to note that strength is challenging to define and measure, and it can be influenced by various factors such as technique, training frequency and volume, and hormonal status. When comparing individuals of the same body weight, the difference in lower-body strength between men and women becomes less significant, especially when considering lean muscle mass instead of total body weight.
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Upper-body strength
Women generally have greater strength in their lower bodies. Research shows that women have about 52% of the strength of men in their upper bodies and 66% in their lower bodies. This difference is due to men having larger muscle fibres and more muscle mass in their upper bodies. Men also have more testosterone, which promotes muscle growth. Women's bodies tend to conserve some calories as fat, which is stored in the chest, hips, and glutes.
Women can still develop strong, defined upper-body muscles, but it takes hard work and patience. Heavy resistance training is recommended for building upper-body strength. Women can also perform resistance training exercises in the comfort of their own homes. It is important to warm up before any resistance workout to get the body ready for exercise and reduce the risk of injury.
Women can benefit from upper-body strength training in several ways. Firstly, it helps to boost muscle strength and endurance in the arms, back, chest, and shoulders. It also helps burn calories, reduce the risk of injury, and build stronger bones. Additionally, it can make daily tasks easier to perform and help improve posture.
Some recommended exercises for upper-body strength training for women include the bench press, bicep curls, and latissimus pull-downs. For those who are just starting, it is important to focus on form or technique before increasing the weight or number of sets. It is also crucial to engage the core during exercises to support the lower back. If discomfort or pain persists, it is advisable to consult a doctor or physical therapist.
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Frequently asked questions
Yes, girls have muscles.
Yes, women typically have less muscle mass than men. On average, women's bodies are around 30-35% muscle by weight, while men's bodies are around 40-50% muscle by weight.
Women have a higher body fat percentage than men, and muscle mass is closely related to body fat percentage. Women have around 12% essential body fat to regulate their hormones, while men have around 3% body fat.
Women generally have less muscle strength than men due to their lower muscle mass. However, women have been found to exhibit greater endurance during exertion by switching between Type 1 and Type 2 muscle fibres.
While women can build muscle through exercise, they typically cannot match the bulk or strength of men's skeletal muscles without artificially and significantly raising their androgen levels, which could be dangerous.
