Bodystat® 1500
single frequency, body composition monitoring unit.
This unit qualifies for CE 0120 Registration in compliance with the Medical Devices Directive and FDA accreditation.
The Bodystat®1500 measures the impedance value of the body at a fixed frequency of 50 kHz. It is an enormously successful product and used extensively in various international research projects, some of which have already been published and have confirmed the unit's accuracy of measurement.
Used by athletic and sports teams, medical researchers & sports scientists, fitness pros in fitness centres, sports & leisure centres, gymnasiums and weight-loss clinics, corporate health & fitness.
In action...
The physical principle behind the Bio-Impedance Analysis (BIA) technique is that the body's lean (muscle, bone, water) compartment, comprising approximately 60-75% electrolytic water, conducts electricity far better than the body's fat compartment which is very low in body water content (between 5-10%)These two compartments have, therefore, very different impedance (or resistance) values to a high-frequency electrical signal. The single impedance measurement reflects the degree of resistance to the flow of current in the body, water being a good conductor but fat a bad conductor.
Bodystat®1500 requires no specialist skills and its measurements are highly reproducible. This is unlike skinfold calipers. While the subject is lying down, two Bodystat¨ disposable electrodes are placed on the right hand and two on the right foot. The crocodile clips are attached to the exposed tabs on the electrodes. Once the appropriate data of gender, height, weight and age are keyed into the unit, the enter key is pressed and within 3 seconds the comprehensive personal body composition statistical analysis is displayed on the LCD screen.
Results displayed include...
| |
Actual |
Normal range |
Fat %
Fat weight
Lean %
Lean weight
Total body weight
Water %
Water volume
BMI - body mass index
Basal metabolic rate
BMR /body weight
Est. energy requirement
Impedance |
22.6 %
13.7 kg
77.4 %
46.9 kg
60.6 kg
56.3 %
34.1 Lt
21
1563 Kcal
25.8 kg
2188 Kcal
530 Ohms |
20 - 26 %
12 - 16 kg
74 - 80 %
45 - 48 kg
59 - 62 kg
50 - 60 %
30 - 37 Lt
20 - 25
|
Benefits...
-
Income generator for the fitness professional
-
Essential motivational tool
-
Superb membership retention device for health clubs, etc
-
Perfect for weight management programs
-
Puts the professional user ahead of the competition
-
Accurate tracking of changes in Fat/Lean for clinical trials
-
-
-
-
-
-
Optional Windows software available
-
Built-in automatic calibration
-
-
-
High contrast, 2 line LCD display
-
Automatic 100 test counter
-
-
Actual results & recommended ranges
-
-
12 month parts and labour warranty
-
Accepts metric or imperial units
-
Quality approved: RWTUV/GS, CE 0120 Medical Devices Directive and FDA
-
Available in English, French, German, Italian, Portuguese and Spanish
Research...
Comparative evaluation of body composition methods and predictions and calculation of density and hydration fraction of fat-free mass, in obese women. N.J. Fuller, M.B. Sawyer and M. Elia. International Journal of Obesity (1994) 18: 503-512.
Researchers found Bodystat® to be the most accurate BIA method of measuring body composition in obese females when compared against densitometry and deuterium dilution. Refer specifically to pages 508 (Table 4) and the last paragraph on page 510.
A comparison of four commercial systems used to measure whole-body electrical impedance S.W. Smye, J. Sutcliffe and E. Pitt. Physiological Measurement (1993) 14: 473-478.
The accuracy of the Impedance measurement is compared and highlights the fact that Bodystat's capacitance in vivo measurement is the most accurate. Refer specifically to the abstract section page 473 and the last two paragraphs on page 477.
Body composition at the bedside. Ghosh, et al. European Journal of Gastroenterology & Hepatology (1997) 9: 783-788
Our hand-held Bodystat®1500 unit was satisfactorily evaluated amongst healthy subjects and hospitalised patients against DEXA in terms of the measurement of lean body mass (LBM). The unit was advocated for use on non-obese and thin adults and to include specifically patients with eating disorders, chronic alcoholic pancreatitis and inflammatory bowel disease.
Angiotensin-converting-enzyme gene insertion/deletion polymorphism and response to physcial training. Hugh Montgomery MRCP et al. The Lancet (1999) 353: 541-545.
Additional scientific supporting literature on accuracy...
University of Aberdeen Medical School.
Bodystat® was found to be comparable to skinfold and underwater (hydrostatic) weighing methods of measuring body composition.
Abstract of communications.
Dunn Clinical Nutrition Centre, part of the Medical Research Council in the UK. An abstract of a scientific presentation to the Nutrition Society in 1993 depicting the accuracy of Bodystat® in respect of lean and obese females.
Physical activity & health in the elderly.
Abstract presentation by the University of Stirling in Scotland. Bodystat® 1500 was found to measure % bodyfat more satisfactorily on healthy elderly subjects with a mean age of 70 compared to other BIA machines.
Dunn Nutrition Centre, Cambridge, UK.
Evaluation report dated September 1991. Bodystat® 500 (our earlier model) was favourably evaluated compared against other BIA machines and methods of measuring bodyfat with particular reference to obese females.
Comparison of body composition analysis using whole body MRI, BIA and skinfold in lean and obese healthy and Prader-Willi Syndrome subjects.
Abstract published at the BAPEN conference in UK December 1997 by the Robert Steiner MRI group at the Hammersmith Hospital in London. In obese and PWS subjects there was no difference between our Bodystat® 1500 unit and MRI whereas skinfold under-estimated % body fat.
Body Water Is Reduced In Breastfed Jaundiced Babies
Strehle E, Robinson D, El Habbal MH, King George Hospital, Ilford and The Royal Free Hospital, London. World pediatrics, adolescent and family care (In Press) 2000.
Aims:
To determine the changes of body composition that occur in infants with hyper-bilirubinaemia secondary to breast feeding.
Methods:
The changes in body water (BW) that occur in term infants with breastfeed jaundice (n = 10) were compared to that of healthy control (n = 20). Extracellular and total BW were measured using bioelectrical impedance spectroscopy (BIS) from 5 to 500 kHz at 25 kHz intervals. Measurements were made on day 3 of life. Body weights were 3.2 (2.6 - 3.8) kg for patients and 3.1 (2.5 - 3.9) kg for control.
Results:
In patients and controls, there was a direct correlation between the frequency and impedance values (r = - 0.89 for patients and r = - 0.91 for control, p < 0.0001). In patients, the median impedance was 539 (451 - 592.5) Ohms vs. 476 (426 - 529) Ohms for control, p < 0.001. The ratio of the impedance at high frequency to that at low frequency was 1.25 for patients and 1.3 for control.
Conclusions:
In breastfed jaundiced babies, BW is reduced. BIS should be used for assessing BW to determine those at risk of jaundice which may reduce morbidity.
Body Composition: A Motivational Tool in Anorexia Nervosa. T Baker, Dorset Healthcare NHS Trust.
Key words:
Body composition, motivation, in-patient, Anorexia Nervosa.
Background:
Weight is commonly used as a means of monitoring progress in the treatment of Anorexia Nervosa, but it is a crude measure of health. Patients have a fear of weight gain, particularly becoming "fat",. A more detailed measure was needed to provide accurate information to patients as to what their weight gain entailed. Anthropometric measurements, such as skin folds and measuring waist and hip circumference, were considered too intrusive and had poor reproducibility. Body composition using total body water is for research establishments, and dual energy X-ray absorptiometry (DEXA) was considered too expensive to do regularly (but is useful to highlight osteoporosis). Body composition measured by bioelectrical impedance was considered a good option, and reviewing the research and data, a Bodystat machine was purchased. Use was first reported in 1969, but developed by Lukaski in 1985.
The Bodystat Machine
The Bodystat machine is inexpensive, non-invasive and portable. The results are quickly obtained and are repeatable, reliable and valid. It works on the premis that fat free mass is a good conductor of electricity and fat and bone are poor conductors. The machine measures the body's resistance to a current, and gives readings of body fat, lean weight, body water. It estimates basal metabolic rate and energy requirements. The patient has to lie down and have electrodes attached to the right hand and right foot. Age, sex, height and weight have to be entered.
Some Findings
For over 2 years, body composition has been carried out on all in-patients at Kimmeridge Court Eating Disorders Unit. The age range of subjects was 17-52 years, predominantly female (94%), with BMI of 9.8 upwards. No patients refused an assessment, and some asked for them more regularly than stated on the protocol.
On admission, the intial analysis may be misleading, for patients are frequently dehydrated. This shows up as a higher than expected fat composition, eg: one female patient had BMI: 9.8, with a body fat of 28.6%; usual range for BMI: 20-24 is 20%-26% body fat.
Response of Users
Patients are reassured that weight gain does not equate to a gain in fat weight. This motivates them to remain on the in-patient programme to achieve a healthier weight.
The analysis also shows that as patients gain weight, they need to eat more, in terms of calories, to maintain this. In the unit this often means that patients have an extra snack than previously. As this can be explained due to change in metabolic rate, acceptance is easier.
Patients have said that body composition was "very helpful" and that it "calms the mind". The machine is impartial and cannot lie according to them. This short paper will cover the user of body composition as a motivational tool for some patients but also as providing useful information around progress of weight gain and the provision of nutritional advice.
Software used
| 
