Essential - body fat stored in the bone marrow, organs, lipid rich tissues in the brain and the gender specific female mammary glands and pelvic region. Storage - adipose tissue that protect the various internal organs from trauma and subcutaneous tissue. Indirect Hydrostatic weighing - consists of computing body density by weighing underwater body weight. Measurements are taken with calipers and can be extremely misleading unless the person doing the measurements is experienced and trained. Various site measured.
Technique is useful and valid.
Bioelectric impedance - measures resistivity to flow of an elctric current passed between two parts of the body and subsequent conversion to body fat. Hyperplasia - increase in body fat due to an increase in fat cell number. After age 13, fat cell size increases during adolescence. Adult fat cells are 4 time greater in size than those found in infants and children up to 1 year old. Fat cell number is formed during the last trimester of pregnancy.