Wrist-wearable bioelectrical impedance analyzer with contact resistance compensation function

2016 ◽  
Author(s):  
Myoung Hoon Jung ◽  
Kak Namkoong ◽  
Yeolho Lee ◽  
Young Jun Koh ◽  
Kunsun Eom ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Bioelectrical Impedance ◽  
Impedance Analyzer ◽  
Bioelectrical Impedance Analyzer ◽  
Compensation Function

scholarly journals Wrist-wearable bioelectrical impedance analyzer with miniature electrodes for daily obesity management

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Myoung Hoon Jung ◽  
Kak Namkoong ◽  
Yeolho Lee ◽  
Young Jun Koh ◽  
Kunsun Eom ◽  
...  
Keyword(s):  
Contact Resistance ◽  
Body Fat ◽  
Bioelectrical Impedance ◽  
The Body ◽  
Upper Body ◽  
Sensor Technology ◽  
Clinical Test ◽  
Obesity Management ◽  
Impedance Analyzer ◽  
Bioelectrical Impedance Analyzer

AbstractBioelectrical impedance analysis (BIA) is used to analyze human body composition by applying a small alternating current through the body and measuring the impedance. The smaller the electrode of a BIA device, the larger the impedance measurement error due to the contact resistance between the electrode and human skin. Therefore, most commercial BIA devices utilize electrodes that are large enough (i.e., 4 × 1400 mm2) to counteract the contact resistance effect. We propose a novel method of compensating for contact resistance by performing 4-point and 2-point measurements alternately such that body impedance can be accurately estimated even with considerably smaller electrodes (outer electrodes: 68 mm2; inner electrodes: 128 mm2). Additionally, we report the use of a wrist-wearable BIA device with single-finger contact measurement and clinical test results from 203 participants at Seoul St. Mary’s Hospital. The correlation coefficient and standard error of estimate of percentage body fat were 0.899 and 3.76%, respectively, in comparison with dual-energy X-ray absorptiometry. This result exceeds the performance level of the commercial upper-body portable body fat analyzer (Omron HBF-306). With a measurement time of 7 s, this sensor technology is expected to provide a new possibility of a wearable bioelectrical impedance analyzer, toward obesity management.

Relationship between Bioelectrical Impedance and Anthropometric Techniques to Determine Body Fat in a Black Pediatric Population

1990 ◽  
Vol 2 (2) ◽  
pp. 140-148 ◽  
Author(s):  
N. Kay Covington ◽  
Darlene A. Kluka ◽  
Phyllis A. Love
Keyword(s):  
Body Fat ◽  
School Environment ◽  
Pediatric Population ◽  
Bioelectrical Impedance ◽  
Black Children ◽  
Impedance Analyzer ◽  
Moment Coefficient ◽  
Percentage Of Body Fat ◽  
Impedance Technique ◽  
Bioelectrical Impedance Analyzer

This investigation compared the percentage of body fat obtained using the bioelectrical impedance technique and the anthropometric technique on a black pediatric population consisting of 196 subjects, 93 girls and 103 boys, ages 5-11 years. Subjects were measured utilizing the Bioelectrical Impedance Analyzer-103 (RJL Systems, Inc.). In order to simulate a realistic school environment, protocol was deliberately not followed. Anthropometric measurements were obtained at two sites: triceps and medial calf. The anthropometric and BIA percentages of body fat were compared using the Pearson product-moment coefficient or correlation and an ANOVA. The overall relationship between the groups was .809. Use of the BIA appears to lead to an overestimation of fatness in black children.

scholarly journals ASUPAN ISOFLAVON KEDELAI KURANG SEBAGAI FAKTOR RISIKO KEPADATAN TULANG RENDAH PADA WANITA PASCAMENOPAUSE

2014 ◽  
Vol 3 (4) ◽  
pp. 807-817
Author(s):  
Nimas Prabaningrum ◽  
Fillah Fithra Dieny
Keyword(s):  
Vitamin A ◽  
Vitamin K ◽  
Hormone Replacement ◽  
Bioelectrical Impedance ◽  
Chi Square ◽  
Food Frequency ◽  
Impedance Analyzer ◽  
T Score ◽  
Bioelectrical Impedance Analyzer ◽  
Diabetes Melitus

Latar Belakang : Osteoporosis pascamenopause merupakan osteoporosis yang paling sering terjadi, disebabkan oleh penurunan kadar estrogen dan faktor – faktor lain antara lain asupan kalsium, vitamin (A, D, C, K) ,konsumsi kafein, riwayat penyakit diabetes melitus (DM) dan lama menopause pada wanita. Isoflavon kedelai dapat berfungsi sebagai hormone replacement therapy karena memiliki kemiripan struktur kimia dan fungsi dengan hormon estrogen. Tujuan penelitian adalah untuk menganalisis asupan isoflavon kedelai, vitamin (A, D, C, K), kalsium, konsumsi kafein, riwayat DM dan lama menopause sebagai faktor risiko kepadatan tulang rendah wanita pascamenopause.Metode : Penelitian observasional dengan desain kasus kontrol pada wanita pascamenopause di Kelurahan Ngemplak Simongan, Bongsari dan Barusari Kota Semarang. Kelompok kasus (50 orang) didapatkan dengan cara random sampling, lalu dicari kelompok kontrol (50 orang) dengan melakukan matching status gizi berdasarkan persen lemak tubuh. Data kepadatan tulang diperoleh menggunakan densitometer quantitative ultrasound, data persen lemak tubuh diperoleh menggunakan BIA (Bioelectrical Impedance Analyzer), data riwayat asupan zat gizi diperoleh melalui wawancara menggunakan semi-quantitatives food frequency questionnaire. Analisis bivariat menggunakan uji Chi Square dan Fisher Exact, analisis multivariat menggunakan uji Regresi Logistik.Hasil : Rerata kepadatan tulang (T-Score) kelompok kasus -1,9±0,49 SD sedangkan kelompok kontrol -0,4±0,47 SD. Rerata variabel asupan zat gizi (isoflavon kedelai, kalsium, vitamin A, vitamin D, vitamin C, vitamin K) kelompok kontrol lebih besar dibandingkan kelompok kasus. Asupan isoflavon kedelai, vitamin A, vitamin K, riwayat DM dan lama menopause merupakan faktor risiko kepadatan tulang rendah pada wanita pascamenopause yang bermakna. Faktor risiko paling berpengaruh pada kepadatan tulang rendah pada wanita pascamenopause yaitu asupan isoflavon kedelai kurang (p=0,000;OR=7,9), riwayat penyakit diabetes melitus (p=0,004;OR=13,682) dan lama menopause > 10 tahun (p=0,037;OR=3,364).Kesimpulan : Asupan isoflavon kedelai kurang, riwayat penyakit diabetes melitus (DM) dan lama menopause > 10 tahun merupakan faktor risiko yang paling berpengaruh pada kepadatan tulang rendah wanita pascamenopause. Asupan isoflavon kedelai < 35 mg/hari meningkatkan risiko kepadatan tulang rendah sebesar 7,9 kali, riwayat DM meningkatkan risiko kepadatan tulang rendah sebesar 13,7 kali dan lama menopause > 10 tahun meningkatkan risiko kepadatan tulang rendah sebesar 3,4 kali.

Evaluation of a Foot-to-Foot Bioelectrical Impedance Analyzer in Pre-Menopausal Hispanic and Caucasian Women

2006 ◽  
Vol 38 (Supplement) ◽  
pp. S310
Author(s):  
Sarah E. Deemer ◽  
Bernadette M. Franco ◽  
Charlie Potter ◽  
Carlos G. Sifuentes ◽  
Clarelouise A. Highfield ◽  
...  
Keyword(s):  
Bioelectrical Impedance ◽  
Impedance Analyzer ◽  
Caucasian Women ◽  
Bioelectrical Impedance Analyzer
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