There are different types of muscle from a biological perspective, however, there is no such thing as lean muscle. Lean suggests the absence of body fat. But the fact is that all muscle is lean muscle. It is important to build muscle mass as the body ages, however, it is more important to build lean body mass. Here is the difference.
Lean Body Mass is the total weight of an individual’s body minus all the weight from the fat mass.
Lean Body Mass (LBM) = Total Weight – Fat Mass
Lean Body Mass includes the weight of the:
Because Lean Body Mass consists of various components, any change in the weight of these areas is recorded as changes in lean body mass. However, the weight of the body’s organs will not change. Bone density does decrease with time and age, but will not significantly affect the weight of lean body mass. With lean body mass, 2 areas of focus include:
Sometimes, individuals use the term lean muscle referring to the shape of the muscles. However, both types of muscle are lean and fat-free.
Increases in Skeletal Muscle Mass are also an increase in Lean Body Mass. What tends to happen is individuals combine them as lean mass gains or lean gains. However, an increase in Lean Body Mass does not always increase muscle.
This is because body water makes up a significant portion of an individual’s Lean Body Mass. For example, a body composition analysis of a 174-pound male.
98.1 Total Body Water + 35.5 Dry Lean Mass = 133.6 Lean Body Mass
Muscle gains contribute to Lean Body Mass gains, but so does water. The difference is that water levels can fluctuate throughout the day depending on:
The muscle tissue itself contains a significant amount of water. Muscle tissue is comprised of up to 79% water. Research has shown that resistance training increases intracellular water in both men and women. This creates an issue when looking at lean gains.
Don’t try to use a scale to calculate changes in Skeletal Muscle Mass. A popular method used is to estimate muscle gain from the number on the scale and applying fitness websites/magazine tips. The problem with this technique is that estimating progress has many factors that can influence an increase in body weight. These include:
Most methods of body composition analysis divide the body into Lean Body Mass or Fat-Free Mass/Fat Mass. These include:
Each has its pros and cons with a difference in accuracy, depending on the technique used.
A lean body mass calculator computes various factors that include:
It is the difference between total body weight and body fat weight. However, these calculations are more for helping physicians determine the appropriate amount of prescription medication/s or if an individual will be undergoing anesthesia and not a computation of overall body composition.
Body fat percentage is different, as far as, the healthy range for men and women. This can provide insights into the overall health of a person.
Galán-Rioja, Miguel Ángel et al. “Effects of Body Weight vs. Lean Body Mass on Wingate Anaerobic Test Performance in Endurance Athletes.” International journal of sports medicine vol. 41,8 (2020): 545-551. doi:10.1055/a-1114-6206
Köstek, Osman et al. “Changes in skeletal muscle area and lean body mass during pazopanib vs sunitinib therapy for metastatic renal cancer.” Cancer chemotherapy and pharmacology vol. 83,4 (2019): 735-742. doi:10.1007/s00280-019-03779-5
Ribeiro, Alex S et al. “Resistance training promotes an increase in intracellular hydration in men and women.” European journal of sports science vol. 14,6 (2014): 578-85. doi:10.1080/17461391.2014.880192
Ten Haaf, Dominique S M et al. “Protein supplementation improves lean body mass in physically active older adults: a randomized placebo-controlled trial.” Journal of cachexia, sarcopenia and muscle vol. 10,2 (2019): 298-310. doi:10.1002/jcsm.12394
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