Human Health

RJL Quantum analyzers utilize bioelectrical impedance analysis to safely obtain reliable and accurate body composition data.

The portability and reliability of the Quantum Analyzer make it a first choice among researchers and educators worldwide.  With the new focus on preventive lifestyle factor research, accurate body composition assessment again comes to the forefront, to help monitor changes over time.

RJL Quantum analyzers have been trusted by clinicians and researchers worldwide for over 30 years, and featured in over 1000 research articles and papers on human health.

School teachers and university professors frequently refer their students to our Online Interactive Body Composition Assessment tool  (LINK).  Students of all ages enjoy ‘learning what they’re really made of’, and gain a deeper respect for the body and related health issues.

Quantum Analyzers are registered with the FDA as a Class II Medical Device, and have been used widely in the study of human health.  Here is just a sampling of the use of RJL Quantum Analyzers, but feel free to later browse the Research area of our site.

  • Obesity – To provide specific body composition factor measurements and changes
  • Cancer – To measure fluid, composition and other changes in various cancer types
  • Nephrology- To monitor intracellular, extracellular and total body water changes
  • Diabetes – To measure effects of lifestyle changes on known diabetes risk factors
  • Wasting Diseases – To measure and manage specific changes in body composition
  • Surgery – To better manage postoperative bariatric complications and nutritional status

Digant Gupta et-al wrote a series of papers on phase angle (ratio of reactance / resistance) in predicting the prognosis in advanced cancers [1,2,3]. D.P. Mellar[4] and L. Santarpia[5] also published on the importance of measuring phase angle in the presence of cancer and chemotherapy. The number of validation papers for assessing body fat compared to DEXA, hydrodensitometry and skin fold measurements are too numerous to mention. Even though there have been hundreds of validation papers published that compliment BIA, there are very few papers describing the utility of BIA. The most significant characteristic of BIA is its repeatability and, therefore, its ability to track change. An example of this is assessing hydration disorders in nursing homes [6] and hospital patients while taking pharmaceutical agents such as diuretics. BIA could define a base line hydration index on elderly heart disease patients that can be kept in balance by daily monitoring at home.

Case Studies Several of our customers have been kind enough to write about how BIA affects their work…

  • Lee Trotter, D.O. — Bariatrics Managing Postoperative Complications and Nutritional Deficiencies in order to Improve Outcomes of Bariatric Surgery. Dr. Trotter has also prepared a presentation discussing the usefulness of BIA in bariatric practice.
  • Dorothy VanderJagt PhD. — Research Estimation of the nutritional status of displaced children in a rural area of Nigeria using bioelectrical impedance analysis.

The documents above were not created RJL Systems. Their content is the sole responsibility of the authors.

Peer-Reviewed Papers We also have a collection of published, peer-reviewed journal articles that discuss different uses of BIA in humans, plants, and animals.

Abstracts of Papers written about BIA

1. Digant Gupta, Carolyn A Lammersfeld, Jessica L Burrows, Sadie L Dahlk, Pankaj G Vashi, James F Grutsch, Sara Hoffman, and Christopher G Lis Bioelectrical impedance phase angle in clinical practice: implications for prognosis in advanced colorectal cancer Am J Clin Nutr 2004;80:1634-8.

2. Digant Gupta*, Christopher G. Lis, Sadie L. Dahlk, Pankaj G. Vashi, James F. Grutsch and Carolyn A. Lammersfeld Bioelectrical impedance phase angle as a prognostic indicator in advanced pancreatic cancer British Journal of Nutrition (2004) 92, 957-962.

3. Digant Gupta, Carolyn A Lammersfeld, Pankaj G Vashi, Jessica King, Sadie L Dahlk, James F Grutsch and Christopher G Lis Bioelectrical impedance phase angle as a prognostic indicator in breast cancer BMC Cancer 2008, 8:249.

4. Mellar P. Davis, MD, FCCP, Tugba Yavuzsen, MD, Dilara Khoshknabi, MD, Jordanka Kirkova, MD, Declan Walsh, MSc, FACP, FRCP, Lasheen Wael, MD, Ruth Lagman, MD, MPH, FACP, and Matthew T. Karafa, PhD. Bioelectrical Impedance Phase Angle Changes During Hydration and Prognosis in Advanced Cancer AM J HOSP PALLIAT CARE January 30, 2009:10.1177.

5. Lidia Santarpia, MD, Ph.D.*, Maurizio Marra, B.S., Concetta Montagnese, B.S., Lucia Alfonsi, M.D., Fabrizio Pasanisi, M.D., and Franco Contaldo, M.D. Prognostic significance of bioelectrical impedance phase angle in advanced cancer: Preliminary observations Nutrition 25 (2009) 930-931.

6. Robert D. Allison, PhD, A. Ray Lewis, DO, Rudy Liedtke, BEE, N. Dean Buchmeyer, MD and Harold Frank, MD Early Identification of Hypovolemia Using Total Body Resistance Measurements in Long-Term Care Facility Residents Gender Medicine/Vol 2 No 1, 2005.