Koosseisu

Koosseisu is a term used to describe body composition—the relative distribution of tissue and fluid components that make up the body. It typically refers to the amounts of fat mass, lean mass (including muscle and organs), bone mineral content, and total body water. In practice, koosseisu focuses on how much of the body is stored as fat versus lean tissue and how much fluid is present.

Measurement methods for koosseisu include dual-energy X-ray absorptiometry (DXA), which estimates fat mass, lean mass, and bone mineral content; bioelectrical impedance analysis (BIA), which uses electrical conductivity and hydration status to infer body compartments; and other techniques such as hydrostatic weighing, air displacement plethysmography (BodPod), and skinfold measurements. Each method has limitations and can be influenced by factors like hydration, recent meals, and equipment.

Components commonly considered in koosseisu are essential fat versus stored fat, lean body mass (muscle, organs, and connective tissue), bone mineral content, and total body water. Sex, age, genetics, and ethnicity influence typical ranges, as do lifestyle factors such as diet, physical activity, and health status.

Importance and applications of koosseisu include clinical assessment of obesity, cachexia, and osteoporosis risk, as well as metabolic health. In sports science, body composition monitoring helps track training adaptations and optimize performance. In research, koosseisu informs studies on aging, disease risk, and nutritional status.

Limitations should be acknowledged: no single method perfectly reflects body composition, readings are estimates, and hydration or recent dietary changes can affect results. Standardized protocols are essential for comparability.