Is hydrostatic weighing a good way to measure increases in muscle mass?

Yes, underwater (hydrostatic) weighing is one of the most accurate methods of measuring body fat. Using Archimedes' buoyancy principle, hydrostatic weighing calculates the amount of body fat based on the difference between a person's weight on dry land and their weight while suspended in a liquid of known density. This works because of the different relative densitites of fat and lean body mass. Lean body mass (muscle, bone, and organs)is more dense than water, so when placed in water, it will sink. Fat tissue is less dense than water and will float. Using the dry weight, wet weight, and density of the liquid, you can determine the volume and weight of the fat tissue within the body. While this method is highly accurate, it is difficult to find and expensive. Special equipment is necessary and not all fitness facilities have this equipment available.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.