什麼是肌肉量？了解其益處與重要性

肌肉常被描述為身體燃燒脂肪和卡路里機制的「引擎」。增加肌肉量可以減少體脂肪、增強免疫系統、提升能量水平並減輕壓力。

肌肉量的多重益處

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. Muscle is more dense than fat, which means that if you’ve increased your activity levels but aren’t losing weight, it may be due to the fact that you’re adding lean muscle mass—a positive trend for your health in the long run.

If you have low muscle mass, or want to manage muscle mass, what can you do? Let’s look at how muscle mass is measured, examine its benefits, and see what you can do to grow muscle mass. Get the science behind muscle growth mechanisms and see their significance to your health.

什麼是肌肉量？

簡單來說，肌肉量是您身體中肌肉的總量，包括骨骼肌、平滑肌和心肌。

It can be measured as part of your total body composition, along with fat mass and bone 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.

如何測量肌肉量？

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.

Muscle mass can also play an important role in the prevention of certain conditions and chronic diseases. In addition, gaining muscle mass can give you more energy and stronger muscles to perform daily tasks.

How too low muscle impacts your health

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.”

Another study, in PLoS One, noted that “muscle mass mediates associations of BMI with adiposity and mortality and is inversely associated with the risk of death.”

The risk of sarcopenia

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.”

In addition to age, your gender, height, and weight may play a role in how much muscle mass you have. For example, a study in the Journal of Applied Physiology found that men have more skeletal muscle mass than women, and that gender differences are greater in the upper body.

我需要多少肌肉量？

一般而言，正常的肌肉量範圍如下：

How do muscles grow?

When you exercise, you are essentially causing trauma to your muscles, and your body works to repair or replace the damaged cells.

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.

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Body Scan 白色

¥3,434.00 CNY

終極健康檢查。延長壽命。

Body Comp 黑色

¥1,580.00 CNY

為您的身體提供最先進的健康檢查。

Body Smart 白色

¥893.00 CNY

實現目標的強大健康檢測。

為什麼肌肉量對免疫系統有益？

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 role of muscle in anxiety

Many studies have shown that exercise may relieve stress and anxiety. A 2014 study in Frontiers of Psychology, “The anxiolytic effects of resistance exercise,” showed that muscle-building exercise—specifically, resistance training or strength training—has anxiety-reducing effects.

And a 2018 study in JAMA Psychiatry found that people who had mild and moderate depression who performed resistance training two or more times a week saw a significant reduction in their symptoms.

So exercise that increases your muscle mass may have mental health benefits, too.

The role of muscle in insulin sensitivity

You may have heard that excess body fat may lead to type 2 diabetes, and exercise can help lower your risk of both—but did you know that muscle mass may be key to regulating your glucose?

According to a report in The Journal of Clinical Endocrinology & Metabolism, very low muscle mass is a risk factor for insulin resistance, and “higher muscle mass (relative to body size) is associated with better insulin sensitivity and lower risk of pre- or overt diabetes.”

The takeaway? Strength training may help you better regulate glucose.

增加肌肉量的小技巧

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.

If you’re looking to lose excess weight as part of your fitness journey, consider burning body fat by setting weight goals and managing caloric intake. WebMD recommends hiring a fitness trainer who can teach you how to exercise properly, especially if you’re interested in lifting. You may choose to use resistance tubing, free weights, exercise machines, or no equipment at all. Don’t forget to warm up, use the proper equipment, and rest between sessions.

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.

總結

肌肉量有益於免疫系統，同時也能帶來其他健康益處，包括提高胰島素敏感性及延緩與年齡相關的肌肉流失。無論您是想要增加還是維持肌肉量，重量訓練和肌力訓練都可能有所幫助。建議與您的醫生討論，制定適合您的運動計畫。