Clinical Research Core
The ACNC Clinical Research Core (CRC) assists ACNC investigators with all aspects of clinical research including: submitting and monitoring IRB submissions; recruiting participants; training team members; and collecting, storing and managing data. The Core is equipped with cutting-edge technologies to evaluate nutrition, body composition, energy expenditure and to collect biological samples.
The CRC has a full team trained dedicated to conduct high quality clinical research. The CRC has a full time Coordinator (Jill Harsch) who manages the CRC team and provides assistance with all IRB submissions. The CRC has a full time Recruiter who provides expertise in recruiting participants for all ongoing ACNC clinical studies. She reaches out to the community of Greater Little Rock to ensure proper and timely recruitment for ongoing studies. Research study visits are conducted by a team of 5 Nutritionists and a Licensed Nurse who ensure accurate data collection for dietary intake, anthropometrics, body composition, and energy expenditure assessments. Two Technicians are specialized in electroencephalogram assessments. Two Licensed Psychological Examiners assess infants, children and adults for mental, motor and language development; executive functions; intelligence quotient; behaviors; and anxiety and depression. A full time Database Manager provides expertise to design Microsoft Access and SQL Server databases for data storage and analyses.
The CRC facility, established in 1998, is fully equipped to accommodate large longitudinal studies. It includes: 5 overnight rooms with fully equipped bathrooms; a lounge with TV/DVD/computer games; a playroom; a large nursing station; two clinic rooms dedicated to the measurement of food intake and diet evaluation; five clinic rooms dedicated to the evaluation of body composition; five anthropometric and phlebotomy rooms; one indirect calorimetry room; two nursing rooms; three data collection rooms dedicated to the Licensed Psychological Examiners; a laboratory to process and store all biological samples; a dining room and a kitchen.
Major Equipment and Methods
• Dietary assessments are obtained using food frequency questionnaires, 3-day food records analyzed with Nutrient Data System for Research from the University of Minnesota, or weighed food records. Indirect calorimetry is assessed in adults and children using the MOXUS metabolic cart (AEI technologies) and physical activity estimations are obtained using accelerometers (ACTICAL, Respironics). Body composition assessments are obtained using quantitative nuclear magnetic resonance, air displacement plethysmography, or dual energy X-ray absorptiometry technologies, depending on the need of the research studies.
• The Quantitative Nuclear Magnetic Resonance (NMR) technology creates contrast between soft tissues by taking advantage of the differences in relaxation times of the hydrogen nuclei spins in these tissues, leading to a precise and accurate measure of body fat, fat free mass and total water. The Body Composition Laboratory uses the EchoMRI-AH for infants and children up to 50 kg. This device was custom designed to accommodate our pediatric population. Major advantages of this technology include: no radiation exposure, immobilization is not required, and longitudinal and repeated data acquisition is possible throughout infancy and childhood.
• The Air Displacement Plethysmography (ADP) technology provides a precise and accurate measure of fat mass. The BodPod is used for children and adults while the PeaPod is used for infants up to 6 months old. This technique measures body weight and body volume. The body density obtained from these measures help to estimate body fat and fat free mass.
• The Dual Energy X-ray Absorptiometry (DXA) technology provides a very precise and accurate measure of bone mass. It can also measure fat and lean body mass. The CRC uses the Hologic QDR 4500 with a discovery upgrade and Horizon A with visceral core assessment. This technology uses low levels of X-ray to detect differences between bone and soft tissues. Participants need to remain still during the scanning process. The radiation exposure using DXA scanning is very low.