Define Limitations for underwater weighing method?

• This method is expensive, time consuming and usually requires a lot of equipment and space.
• The subject needs to be totally submerged underwater and exhale all of the air from the lungs. This can be difficult for the subjects.
• Requires considerable subject co-operation given that multiple trials needed to obtain accurate estimate of underwater weight.
• Being submerged under water may be difficult and produce anxiety for some.
• Density of FFM assumed may vary if bone density is altered as in the case of elderly or certain disease conditions.