Generation of Prediction Equations for BIA of the Elderly

Study Overview
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Brief Summary
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The objective of the study is to develop prediction equations for calculating Fat-Free Mass FFM, Total Body Water TBW, Extracellular Water ECW, Visceral Adipose Tissue VAT, total Skeletal Muscle Mass SMM and segmental SMM in a group of elderly. The prediction equations are based on linear regression analysis between the gold standard reference methods Air Displacement Plethysmography ADP, Dual-energy X-ray Absorptiometry DXA, Magnet Resonance Imaging MRI, Deuterium dilution method (D2O) and Sodium Bromide dilution method (NaBr) on the one hand and bioelectrical impedance measurements on the other hand. Multi-frequency bioimpedance is measured for all body segments: right arm, left arm, right leg, left leg, trunk, right body side and left body side using the seca mBCA 515 in standing position and the seca mBCA 525 in standing and lying position.

Official Title
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Generation of Prediction Equations to Analyze Body Composition of the Elderly Based on Bioelectrical Impedance Analysis (BIA)

Conditions
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Healthy Elderly

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: male and female subjects older than 60 years, stable medication (no changes during the past 6 months), subjects need to be able to sign the informed consent and privacy policy Exclusion Criteria: acute disease intake of diuretics wearing of support stockings edema diagnosed by inspection and palpation of lower limbs paralysis e.g. after a stroke neurodegenerative diseases e.g. ALS tumors in treatment amputation electronic implants e.g. pacemaker under the skin applied injection systems (e.g. insulin pumps or pain pumps) probands who cannot provide an ICF by themselves probands who might be dependent from the sponsor or the investigation site current alcohol abuse active prostheses electronic life-support systems, e.g. artificial heart, artificial lung portable electronic medical devices, e.g. ECG devices or infusion pumps metallic implants cochlea implants und heart valves prothesis (e.g. Starr-Edwards-Prothesis) vessel clips in the brain or medulla applied before 1995 defeatable pumps catheter iron or metallic parts in the body (e.g. shard of metal) dental braces magnetic tooth implants not removeable piercings extensive tattoos

Ages Eligible for Study
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Minimum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| elderly<br>150 elderlies (>60 years): community dwelling or living in old | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total Body Water | Total body water (TBW) by deuterium (D2O) dilution | 15 minutes | 
| Extracellular Water | Extracellular water (ECW) by NaBr dilution | 15 minutes | 
| Fat-free Mass | Fat-free mass by a 4-compartment model based on dual energy x-ray absorption (DXA), air displacement plethysmography (ADP), D2O dilution and weight | 15 minutes | 
| Skeletal Muscle Mass | Skeletal muscle mass (SMM) by magnetic resonance imaging (MRI) | 1 hour | 
| Visceral Adipose Tissue | Visceral adipose tissue (VAT) by magnetic resonance imaging MRI | 1 hour |