Final answer:
BIA instruments can indeed estimate total body water (TBW). The technique measures the body's resistance to a safe electrical signal to estimate water volume, as water conducts electricity. This is useful for monitoring hydration status for health and athletic assessments.
Step-by-step explanation:
True or false: Some BIA instruments estimate total body water (TBW). The answer is true. Bioelectrical impedance analysis (BIA) is a method used to estimate body composition, including total body water. BIA devices measure the resistance and reactance of body tissues to a small, safe electrical signal passed through the body. This measurement helps to estimate the volume of water in the body, as water is a conductor of electricity and the amount of resistance to the electrical current is influenced by the amount of water in the tissues.
BIA can be particularly useful for monitoring hydration status over time, which is important for various health and athletic assessments. TBW readings provided by BIA devices can help in determining the hydration level of an individual, which is critical for both health and performance.