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Muscles are often described as the “engine” of your body’s fat and calorie burning mechanism. Increased muscle mass can lead to less body fat, a stronger immune system, improved energy levels, and reduced stress.
The many benefits of muscle mass
If you want to grow muscle or manage muscle mass, we’ll tell you about the health effects of muscle, explain the dangers of age-related muscle loss, dive into ways to measure muscle mass, including bioelectrical impedance, and give you tips on achieving high muscle mass.
Skeletal muscle consists of muscle fibers, or myofibers—each of which is a single muscle cell—that are bound together and wrapped by connective tissue called the epimysium.
Approximately 20-80 muscle fibers are grouped together to form a fascicle. The muscles are separated by connective tissue outside the epimysium, called fascia. Tendons connect muscles to bone.
What’s the difference between lean body mass and muscle mass?
These terms are often used interchangeably, but they are different. Lean body mass includes muscle mass—as well as the weight of your organs, bones, skin, and body water. Essentially, it’s everything except body fat. Muscle mass refers to only the weight of your muscles.
How do you measure muscle mass?
Muscle mass can be measured in a doctor’s office or clinical setting using a variety of methods.
A review in the Journal of Clinical Medicine lists several methods, including BMI—a flawed method, because it may underestimate fat-free mass depletion—as well as mid-arm muscle circumference, bioelectrical impedance analysis, dual-energy X-ray absorptiometry, and computed tomography.
Other options for measuring your muscle mass include calculating your body fat percentage, using a U.S. military formula, or getting an MRI. At home, muscle mass percentage may be measured via a smart scale that calculates body composition.
Why does muscle play a vital role in health?
Everyone knows that muscle mass plays a role in increased workout performance, but it can play a role in your overall health, too. In an article in The American Journal of Clinical Nutrition, “The underappreciated role of muscle in health and disease,” researchers point out that muscle plays an important role in whole-body protein metabolism, which is particularly important when it comes to your body’s response to stress—including recovery from trauma or illness.
Unfortunately, low muscle mass can negatively impact your overall health. In a review article in the Annals of Medicine entitled “Implications of low muscle mass across the continuum of care: a narrative review,” the authors indicate that low muscle mass can have negative effects across the healthcare continuum:
“Low muscle mass is associated with outcomes such as higher surgical and post-operative complications, longer length of hospital stay, lower physical function, poorer quality of life and shorter survival.”
And muscle loss tends to increase as we get older. Sarcopenia, or age-related muscle loss, begins at age 30—some estimates say it starts even earlier, at 25—and causes muscle loss of as much as 3 to 5% per decade. Untreated sarcopenia, as well as osteoporosis, can lead to an increased risk of falls and fractures.
In a review published in Frontiers of Endocrinology, the authors note: “Musculoskeletal aging is a major public health ... strain due to the significant demographic modifications in the population, and it is linked to high risk of falls, loss of autonomy in elderly individuals and institutionalization with small health outcomes.”
During this process, the trauma activates satellite cells—located outside your muscle fibers—which then begin to multiply.
Some of them fuse to your muscle fibers to form new muscle fibers and repair damaged ones, and the thickness and amount of your muscle cells increase.
Why is muscle mass good for the immune system?
Exercise can help to boost the immune system—in part because of muscle mass. In a 2019 review in the Journal of Sport and Health Science, the authors noted that exercise has an anti-inflammatory effect, and “habitual exercise improves immune regulation, delaying the onset of age-related dysfunction.”
Why? Multiple studies note that the proteins in muscle mass may be used by the immune system to respond to injury. In “The underappreciated role of muscle in health and disease,” the authors indicate that “altered muscle metabolism plays a key role in the genesis, and therefore the prevention, of many common pathologic conditions and chronic diseases.”
The takeaway? Strength training may help you better regulate glucose.
Tips to grow muscle mass
Strength training can help to build muscle mass—but if you’ve never done it, beginning a regimen may seem intimidating. So how can you start? First: Be sure to ask your doctor before starting a new exercise routine.
In addition to exercise, nutrition may play a role. In a report in Essays in Biochemistry, the authors note: “Timing of ingestion, co-ingestion of nutrients and the type of protein may all influence protein accretion” in building muscle. They also suggest creatine supplements in combination with resistance exercise may increase muscle mass.
Muscle mass benefits your immune system, and it can have other health benefits, too—including increasing insulin sensitivity and delaying age-related muscle loss. Whether you’re trying to grow muscle or preserve muscle, weight training and strength training may help. Consider talking to your doctor to create an exercise routine that’s right for you.
Body+ is an advanced Wi-Fi smart scale that performs highly accurate bioelectrical impedance analysis every time you step in.
Explore your full body composition and weight trends over time while enjoying an unsurpassed battery life of 18 months.