Body composition analysis
This is a safe, fast and non-invasive analysis based on the principle of bioelectrical impedance analysis (multi-frequency BIA), which uses the difference in electrical properties of tissues. During the analysis with the InBody device, a weak, low-intensity alternating electric current is passed through the body, to which the tissues offer varying resistance. Based on the resistance of the tissues, it is possible to determine the amount of muscle, fat and water in the body very accurately. Body composition is a much more accurate and objective outcome compared to the commonly used body mass index (BMI). The determined values of body fat, visceral fat, muscle mass and water in the body are important parameters that can be used in the diagnosis of sick persons, healthy and athletic individuals and also in follow-up examinations to assess the effect of the established nutritional therapy and physical activity.
Why is body composition analysis important?
Body weight alone is not a sufficiently objective indicator for assessing overall health. For this, it is important to have a more detailed knowledge of body composition. The ratio between the different components (muscle and fat mass) is crucial for the evaluation and assessment of health risks. In healthy persons, the individual components are in an ideal ratio. If this ratio is disturbed, various health complications can develop. The purpose of a body composition analysis is to evaluate the structure and function of your body composition and then, based on this data, to set up an individual nutritional plan to promote and strengthen your health.
- 2 hours before the examination do not eat or drink, the ideal state is fasting
- 8-12 hours before the examination do not consume alcoholic beverages
- limit increased physical activity 24 hours before the examination
- it is advisable to visit the toilet before the examination
- the optimal time for the examination is in the morning
- for people with pacemakers or other monitoring devices implanted in the body
- for people with metal implants (joint replacements, implanted metal fasteners, etc.)
- for pregnant women in the first trimester (up to 3 months of pregnancy)
- for children, amputees or elderly individuals for whom it is not possible to grasp and hold the hand electrodes at rest or to stand barefoot on the foot electrodes
Length of the analysis and results interpretation
Price for the public
Resting energy expenditure
The Metalyzer measures resting energy expenditure using indirect calorimetry. This is the minimum amount of energy that the body expends at rest to ensure the function of all organs (e.g. heart, lungs, brain, kidneys, muscles, etc.). The measurement is based on the exchange of gases during energy expenditure, i.e. the difference in the amount of oxygen (O2) inhaled and carbon dioxide (CO2) exhaled. The measured value then indicates how much energy the body uses at rest (physical and mental). Indirect calorimetry is considered the golden standard for determining resting energy expenditure and provides reliable and highly reproducible values. This allows the diet composition and quantity to be tailored to the current state of health and metabolic rate.
Why is resting energy expenditure assessment important?
Energy requirements vary considerably between individuals. Estimation by calculation from equations is more commonly used in practice for rapid assessment, but the accuracy of these calculations is very limited. Where possible, it is always preferable to measure resting energy expenditure (so-called metabolic rate) by indirect calorimetry. The use of indirect calorimetry is particularly beneficial in individuals whose body mass index (BMI) values are further away from the normal reference range. Furthermore, resting energy metabolism is highly variable, depending on many factors such as age, gender, present diseases, medications taken, body composition, etc. It varies not only between individuals but also within each individual over a given time period. Therefore, it cannot be expected that one proposed course of therapy or dietary regimen will be effective for everyone equally. A dietitian will help you individually tailor your diet to your needs and current condition.
A routine measurement will determine your resting energy expenditure. However, if you also want to know what nutrients your body is preferentially using (the proportion of protein, carbohydrates and fats out of your total resting metabolic rate), then you still need to obtain your urine urea waste assessment over 24 hours. For this, you need to make an appointment at any laboratory that performs analyses for self-payers (several tens CZK).
- do not eat for 12 hours before the measurement, the last meal should be light and on the day of the examination come fasting
- arrive at least 30 minutes before the time of the test to allow yourselves to breathe and calm down (physical and mental tension affects the measurement)
- do not do any strenuous physical activity (do not exercise) 24 hours before the measurement
- try to keep activity on a minimum level right before the measurement and be as calm as possible, including taking the lift to the surgery instead of the stairs - this will contribute significantly to the accuracy of the measurement
- since your last meal, drink only plain water, do not drink alcohol, coffee, energy or cola beverages or black/green tea
- no smoking in the morning
- some medications can affect the measurement (e.g. beta blockers, antidepressants, antiobesity drugs, etc.) - if possible, take the medication after the measurement
- there are no specific contraindications for measurements at rest without physical stress
- the test may be more difficult to administer to people suffering from restlessness, anxiety about enclosed spaces and to children under 6 years of age
Two days before the urine waste examination, urine collection should be carried out for 24 hours in a container of known volume (for example, a bottle, a graduated container with a scale). You should have a normal daily routine on these days and not have any unusual physical activity; as a practical matter, it is a good idea to be at home during the time of urine collection. At the end of 24 hours, note the total amount of urine and collect a sample in a prepared clean, resealable container (ideally a test tube). The next day, bring the sample, labelled with your name and the total amount of urine over 24 hours, to one of the laboratories. However, always follow the exact instructions of the laboratory.
30 minutes before the test, sit in the waiting room and relax - ideally do not deal with work or stressful matters. 10 minutes before the test, we will invite you in and put you on the bed where we will let you rest and fill in the personal data with you.
The examination involves measuring the ratio of inhaled to exhaled gases. We will therefore put on a breathing mask to which the machine is connected. Once the measurement is started, try not to think intensively, however, you need to keep yourself awake. After 20-40 minutes, the machine will give an audible signal to indicate that the examination has finished.