The Quantum II is the new standard for whole body bioelectrical resistance and reactance measurements. Accuracy and ease of use are the key features of the Quantum II. Therefore, extremely small changes in body composition can be illustrated due to the instrument's exceptional repeatability.
After testing with the Quantum II Analyzer, the measurements are entered into the BC software which performs the body composition analysis. The end results can provide guidance for an individual to improve their body composition using the diet and exercise wizard in BC.
The Quantum II was featured on CBS Morning News
The RJL unit is used by our personal trainers, dietitian, and weight loss challenge staff as well as an incentive for new member specials. We really value the quality of information and ease of use of our RJL unit.
- Kevin Hunt, Fitness & Wellness Coordinator - Personal Trainer
What is Bioelectrical Impedance Analysis (BIA)
Bioelectrical impedance analysis is the study of the electrical properties of biological material and its change over time. This includes humans, animals, fish, plants, vegetables, fruits and anything living. Even human circulation and breathing can be quantified with a real-time BIA instrument that has enough sensitivity and a short sampling interval[1].
The most popular application for BIA is predicting human body composition as a total body measurement from hand to foot where resistance and reactance is evident from a biological circuit that conducts alternating current. The source electrodes introduce an alternating current (50 Khz) at the base of the toes and fingers. The detecting electrodes measure the voltage drop due to this circuit at the anatomical land marks of the ankle and wrist bones. This is a four electrode or tetrapolar measurement, which is essential to eliminate electrode and field distribution problems associated with two electrode measurements. The conducting media has a resistive and capacitive electrical path. These two values are independently measured and resolve the cellular and ionic components of the material. The cellular volume is measured as capacitive reactance and the resistive volume is ionic resistance, both are expressed in ohms. Modeling these two values as their series or parallel equivalent circuits is important when comparing them to criterion methods.
1. Nyboer, J.: Electrical Impedance Plethysmography. Second Edition. Charles C. Thomas, Springfield, IL, 1970.