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Working out can cause short-term weight gain due to increased muscle mass, inflammation, and fluid retention. This weight gain is typically temporary, and the scale may not reflect an individual's overall body composition and health. While muscle soreness can cause weight gain, it is important to consider other factors such as diet, workout intensity, and individual variations. Water retention, micro-tears in muscles, and increased glycogen storage contribute to the temporary weight gain associated with swollen muscles.
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What You'll Learn
Water retention and muscle repair
It is common to experience weight gain after a workout, which is usually temporary. This weight gain is often due to water retention, which is part of the body's healing response. When you start a new exercise routine, your body undergoes changes as you put more demands on your muscles. This can lead to micro-tears and inflammation, resulting in water retention around the inflamed areas. The extra water helps keep your cardiac numbers stable, but it can also cause temporary weight gain.
Glycogen, which supplies energy to your muscles, can also contribute to water weight gain. When you start exercising intensely, your muscles need more energy, leading to increased glycogen storage. Glycogen binds with water, which can add to your initial water weight gain. However, this effect is typically short-lived and should end within a few weeks to a month.
Additionally, muscle repair and regeneration can lead to temporary weight gain. As your muscles recover from the micro-tears and trauma caused by exercise, they retain fluid, leading to water weight gain. This fluid retention is a natural part of the healing process and should subside as your muscles repair themselves.
It's important to remember that muscle weighs more than fat, and building lean muscle mass can lead to a slight increase in weight. However, this does not necessarily mean you are gaining fat. Your body composition, including body fat percentage, is a more accurate indicator of your fitness progress than weight alone.
To accurately track your progress, it is recommended to use three-dimensional body measurements instead of relying solely on the scale. Apps and smart scales can provide measurements for your chest, waist, hips, and thighs, allowing you to see how your body composition changes over time.
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Muscle trauma and calcium leakage
It is common to experience weight gain after working out, which is usually temporary. This weight gain is due to water retention, which is a natural part of the body's healing response to micro-tears in the muscles.
Working out hard enough can cause muscle fibres to experience micro-tears, also known as muscle trauma or micro-trauma. This trauma causes calcium leakage, which in turn leads to fluid retention and pressure on the muscles and nerve endings. This build-up of fluid is what causes temporary weight gain.
Calcium ions (Ca2+) are released from the sarcoplasmic reticulum into the cytoplasm during each muscle contraction. The sarcoplasmic reticulum controls the release of Ca2+ through the ryanodine receptor (RyR1). Extreme leakiness in RyR1 can cause prolonged elevations in cytoplasmic Ca2+, which has been observed in disease settings and during muscle overtraining.
However, lower levels of Ca2+ leak may be beneficial. Exercise training may provoke changes in baseline cytoplasmic Ca2+ levels, thereby affecting gene expression and other processes. A study by Ivarsson et al. found that mouse skeletal muscle displayed higher baseline Ca2+ concentrations after three weeks of voluntary exercise. This was accompanied by increased expression of genes involved in mitochondrial biosynthesis.
While calcium leakage is typically associated with muscle fatigue, mild calcium leaks can lead to improved resistance to fatigue. This is because muscle training results in adaptations that increase performance and resistance to fatigue.
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Glycogen and energy
When you start a new workout routine, it is common to experience some weight gain. This is often due to temporary water retention, which is part of the body's healing response to the micro-tears and inflammation caused by exercise. However, another factor contributing to this initial weight gain is the increased demand for energy and, consequently, the increased presence of glycogen in the muscles.
Glycogen is a multibranched polysaccharide of glucose that serves as a form of energy storage. It is the main storage form of glucose in the human body and is made and stored primarily in the liver and skeletal muscle cells. The amount of glycogen stored in the body depends on factors such as oxidative type 1 fibres, physical training intensity, basal metabolic rate, and eating habits.
Glycogen is created through the process of glycogenesis, where the body breaks down carbohydrates from food into glucose and then links these molecules together to form glycogen. Insulin, a hormone produced by the pancreas, plays a crucial role in this process by stimulating the production of glycogen synthase, the enzyme responsible for linking glucose molecules.
When the body needs a quick boost of energy or when glucose levels from food begin to fall, glycogen is broken down through glycogenolysis to release glucose into the bloodstream. This process is triggered by the hormone glucagon, which acts as a counterbalance to insulin. While liver glycogen is broken down and distributed throughout the body, muscle glycogen is primarily used by the muscles themselves, especially during the initial transition from rest to activity and high-intensity or anaerobic exercises.
Glycogen binds with water, which can lead to initial water weight gain. However, this effect is typically short-lived and should resolve within a few weeks to a month. It is important to note that the presence of glycogen in the muscles is not solely responsible for the temporary weight gain experienced after intense exercise. The combination of glycogen storage and water retention contributes to this phenomenon.
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Lean muscle mass
While the terms "lean muscle mass", "lean body mass", and "muscle mass" are often used interchangeably, they are not the same thing. Lean body mass refers to the total weight of your body minus fat mass. It is comprised of two parts water, bone minerals, protein content, and other factors. Lean muscle mass, on the other hand, refers specifically to the amount of muscle that makes up your body composition.
Having sufficient lean muscle mass is critical for long-term health and well-being. It is associated with your Basal Metabolic Rate (BMR), which is the number of calories burned at rest. People with higher BMRs will have greater energy expenditure, helping to avoid calorie imbalances and obesity. Lean muscle mass also helps protect against osteoporosis and frailty in later life, as it increases bone strength and density.
As people age, they tend to lose muscle mass, with a decline of about 3-5% per decade after 30 years of age. This muscle loss may lead to increased fatigue, weight gain, and a higher risk of fractures. However, it is never too late to start building lean muscle mass. Diet and exercise are key factors in optimising muscle mass. Resistance training, such as weight-bearing exercises, is particularly effective for building lean muscle mass, although cardio exercises like running, walking, or swimming are also beneficial for overall health.
It is important to note that when beginning a new exercise routine, it is common to experience temporary weight gain due to water retention and increased glycogen stores in the muscles. This is especially true when the body is stressed from a new type of exercise, leading to micro-tears and inflammation. However, this weight gain is not indicative of fat gain and should not be a cause for concern. Instead of relying solely on scales, it is recommended to track body measurements or use 3D body scanning apps to monitor progress and overall body composition.
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Overall body composition
Weight gain after working out is a common phenomenon. It is usually temporary and can be attributed to a variety of factors, including water retention, muscle inflammation, and increased muscle mass.
Water retention, or oedema, is a natural response of the body to exercise-induced micro-tears and inflammation in the muscles. This is particularly true for those new to working out or engaging in a new type of exercise, as the body experiences greater stress and trauma. The body's healing process includes water retention around the inflamed areas, leading to temporary weight gain.
Glycogen, which supplies energy to the muscles, also plays a role in post-workout weight gain. When the muscles are worked intensely, they require more glycogen, which binds with water, leading to initial water weight gain of 1 to 3 pounds. This effect is typically short-lived and should subside within a few weeks to a month.
Additionally, the increase in muscle mass can contribute to weight gain. Muscles are denser and take up less space than fat, so even with a higher number on the scale, one might observe a slimmer body and better-fitting clothes.
While weight gain after working out can be discouraging, it is important to remember that the scale does not tell the entire story. Instead of focusing solely on weight, it is recommended to track body measurements and overall body composition, including body fat percentage. Smart scales and body scan technologies can provide rough estimates of body fat, offering a more comprehensive view of an individual's health and fitness beyond what weight alone indicates.
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Frequently asked questions
Yes, swollen muscles can cause weight gain. This is due to water retention, which is part of the body's healing response to the micro-tears in the muscles.
The weight gain from swollen muscles is usually temporary and should end within a few weeks to a month.
To reduce swollen muscle weight gain, you can try massage, ice, gentle stretching, rest, and anti-inflammatory medications or creams.
Yes, instead of using scales, you can use three-dimensional body measurements to track changes in your body. You can also focus on other signs of progress, such as having more energy or feeling stronger.
