The Technology Behind Raxqen Zynoq

Discover how our revolutionary Multi-Frequency Bioelectrical Impedance Analysis technology, combined with 8 precision electrodes and AI-powered algorithms, delivers medical-grade body composition accuracy in the comfort of your home.

98.2% Accuracy vs. DEXA
4 Measurement Frequencies
8 Precision Electrodes
10s Analysis Time

Understanding Body Composition Technology

From basic weight scales to medical-grade body composition analysis, explore the science that makes Raxqen Zynoq the most advanced smart scale available for home use.

The Evolution of Body Measurement Technology

For decades, measuring body composition required expensive laboratory equipment, specialized medical facilities, or invasive procedures. Traditional bathroom scales could only tell you one thing: your total weight. While weight is an important metric, it tells an incomplete story about your health. Two people with identical weights can have vastly different body compositions—one might be mostly lean muscle while the other carries excess body fat.

The development of Bioelectrical Impedance Analysis (BIA) in the 1980s revolutionized body composition measurement by making it accessible outside of laboratory settings. However, early BIA devices were limited by single-frequency technology that could only provide rough estimates of body fat percentage. These devices often showed significant variability and were heavily influenced by hydration levels, making consistent tracking difficult.

Raxqen Health Technologies was founded with a mission to bring truly accurate, professional-grade body composition analysis to consumers. Our research and development team, comprising biomedical engineers, data scientists, and health professionals, spent over four years developing the proprietary Multi-Frequency BIA technology that powers Raxqen Zynoq. The result is a device that achieves 98.2% correlation with DEXA scan results—approaching the gold standard of body composition measurement while being safe, non-invasive, and convenient for daily home use.

Why Body Composition Matters More Than Weight

Understanding your body composition provides crucial insights that weight alone cannot reveal. Body composition refers to the percentages of fat, bone, water, and muscle in your body. These components have significant implications for your health, metabolism, and physical performance.

Muscle Mass: Skeletal muscle is metabolically active tissue that burns calories even at rest. Higher muscle mass is associated with improved metabolic health, better insulin sensitivity, increased strength and mobility, and enhanced quality of life as you age. When you're on a fitness journey, knowing whether you're gaining muscle or just weight is essential for evaluating your progress.

Body Fat Percentage: Excess body fat, particularly visceral fat stored around internal organs, is linked to increased risk of cardiovascular disease, type 2 diabetes, certain cancers, and metabolic syndrome. However, some body fat is essential for hormone production, temperature regulation, and organ protection. Knowing your body fat percentage helps you determine if you're in a healthy range and track meaningful changes over time.

Body Water: Water makes up approximately 50-70% of your body weight and is critical for virtually every bodily function. Proper hydration affects muscle function, cognitive performance, temperature regulation, and nutrient transport. Monitoring body water helps ensure you're properly hydrated for optimal health and performance.

Bone Mass: Bone health is often overlooked until problems arise. Low bone mass increases the risk of osteoporosis and fractures, particularly as we age. Regular monitoring can help identify declining bone health early, allowing for preventive measures through nutrition and exercise.

🔬 Body Composition Analysis Diagram

Understanding the different components of body composition

Multi-Frequency Bioelectrical Impedance Analysis (MF-BIA)

The core technology that enables Raxqen Zynoq to deliver unprecedented accuracy in home body composition measurement.

What is Bioelectrical Impedance Analysis?

Bioelectrical Impedance Analysis (BIA) is a scientifically validated method for estimating body composition based on the principle that different body tissues conduct electricity differently. When a safe, low-level electrical current is passed through the body, it travels more easily through tissues containing more water (like muscle) compared to tissues with less water (like fat).

By measuring the resistance (impedance) to this electrical current, along with other factors such as height, weight, age, and gender, sophisticated algorithms can calculate the proportions of different body tissues. BIA has been used in clinical and research settings for over four decades and is supported by thousands of peer-reviewed scientific studies validating its effectiveness for body composition assessment.

The impedance measurement consists of two components: resistance (R), which opposes the flow of electrical current, and reactance (Xc), which reflects the cell membrane's capacitive properties. Together, these measurements provide the data needed to accurately estimate body composition when processed through validated prediction equations.

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Single-Frequency vs. Multi-Frequency BIA

Traditional consumer-grade body composition scales use single-frequency BIA, typically operating at 50kHz. While this frequency provides useful information, it has significant limitations. At 50kHz, electrical current flows primarily through extracellular water (water outside cells) and only partially penetrates cell membranes to measure intracellular water (water inside cells).

This limitation means single-frequency devices cannot accurately distinguish between intracellular and extracellular water compartments, leading to less precise body composition estimates. Factors like hydration levels, recent exercise, and food intake can significantly affect single-frequency BIA results, leading to inconsistent measurements.

Multi-Frequency BIA (MF-BIA), as used in Raxqen Zynoq, addresses these limitations by measuring impedance at multiple frequencies. Lower frequencies (5kHz) flow almost exclusively through extracellular fluid, while higher frequencies (250kHz-500kHz) can penetrate cell membranes and measure total body water including intracellular fluid. This comprehensive approach enables significantly more accurate body composition analysis.

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Raxqen Zynoq's Four-Frequency Approach

Raxqen Zynoq utilizes a proprietary four-frequency measurement protocol, analyzing impedance at 5kHz, 50kHz, 250kHz, and 500kHz. Each frequency provides unique information about body composition:

  • 5kHz (Low Frequency): At this frequency, electrical current flows predominantly through extracellular water (ECW). This measurement helps quantify the water outside your cells, which includes blood plasma, interstitial fluid, and lymph. ECW measurements are particularly useful for detecting fluid retention and edema.
  • 50kHz (Standard Frequency): This is the most commonly used frequency in BIA devices. It provides a balance between extracellular and intracellular measurement, giving overall impedance data that correlates well with total body composition. This frequency serves as a reference point for our algorithms.
  • 250kHz (High Frequency): At higher frequencies, electrical current can penetrate cell membranes more effectively, allowing measurement of intracellular water (ICW). This frequency provides valuable data about the water inside cells, which is primarily found in muscle tissue.
  • 500kHz (Ultra-High Frequency): The highest frequency in our protocol enables complete cell membrane penetration, providing accurate total body water (TBW) measurements. This data is crucial for distinguishing between fat-free mass components and calculating precise body fat percentage.

By combining data from all four frequencies, our algorithms can accurately calculate intracellular water, extracellular water, total body water, fat-free mass, and fat mass. This multi-frequency approach is what enables Raxqen Zynoq to achieve 98.2% correlation with DEXA scan results.

Frequency Penetration Characteristics

5kHz
Extracellular Water Only
50kHz
Partial Cell Penetration
250kHz
Good Cell Penetration
500kHz
Complete Cell Penetration

Advanced 8-Electrode Measurement System

Understanding why more electrodes means more accurate and detailed body composition analysis.

Why 8 Electrodes Matter

The number and configuration of electrodes in a body composition device directly impacts measurement accuracy and the level of detail available in the results. Raxqen Zynoq features 8 high-precision stainless steel electrodes—four on each foot platform—enabling advanced measurement capabilities not possible with simpler designs.

4-Electrode Systems (Basic Smart Scales)

Most consumer smart scales use only 4 electrodes total. In this configuration, current is typically injected through two electrodes and voltage is measured through the other two. The electrical current travels through the lower body (legs) and provides a whole-body estimate based on statistical correlations.

Limitations: Cannot provide segmental analysis, heavily reliant on statistical assumptions about upper body composition, less accurate for individuals with atypical body proportions, and more susceptible to measurement variations due to foot positioning.

8-Electrode System (Raxqen Zynoq)

Raxqen Zynoq's 8-electrode configuration uses a tetrapolar measurement technique on each foot. Four electrodes per foot allow for separate current injection and voltage measurement electrodes, eliminating contact impedance errors and enabling more precise measurements.

Advantages: True segmental body composition analysis, elimination of electrode-skin contact errors, improved measurement reproducibility, ability to analyze body composition in different regions (legs, trunk estimation), and superior accuracy across different body types.

Electrode Placement and Function

The strategic placement of electrodes on the Raxqen Zynoq platform is the result of extensive research and clinical testing. Each foot platform contains four electrodes arranged to optimize current distribution and voltage measurement:

E1 & E2 Current Injection Electrodes

Located at the heel and toe positions, these electrodes introduce the safe, low-level electrical current into the body. The heel-to-toe placement ensures current travels through the full length of the foot and lower limb.

E3 & E4 Voltage Measurement Electrodes

Positioned between the current electrodes, these measure the voltage drop caused by tissue impedance. Separating current injection from voltage measurement (tetrapolar technique) eliminates skin-electrode contact impedance from the measurement, dramatically improving accuracy.

Segmental Body Composition Analysis

While full segmental analysis typically requires hand-held electrodes (measuring arms independently), Raxqen Zynoq's advanced 8-electrode system combined with our proprietary algorithms can provide segmental insights for the lower body and trunk estimation:

  • Right Leg Analysis: Dedicated measurement of fat mass, muscle mass, and body water in the right leg using electrodes E1-E4 on the right foot platform.
  • Left Leg Analysis: Independent measurement of left leg composition using the left foot platform electrodes.
  • Leg-to-Leg Comparison: Identify asymmetries in muscle development or fat distribution between legs—useful for athletes, physical therapy patients, and anyone wanting balanced development.
  • Trunk Estimation: Using validated bioelectrical impedance spectroscopy models, our algorithms estimate trunk composition based on lower body measurements combined with user profile data.
  • Whole Body Integration: All segmental data is integrated to provide comprehensive whole-body composition metrics with unprecedented accuracy.

🦶 8-Electrode Platform Diagram

Strategic electrode placement for optimal measurement accuracy

Electrode Specifications

Material Medical-grade 316L Stainless Steel
Surface Treatment Electropolished, Anti-corrosion
Configuration Tetrapolar (4 per foot)
Contact Area Optimized for all foot sizes
Current Type Alternating Current (AC)
Current Level < 500 microamperes (safe)

AI-Powered Analysis Algorithms

How machine learning and advanced mathematics transform raw impedance data into actionable health insights.

The Role of Algorithms in Body Composition Analysis

Raw impedance measurements alone cannot determine body composition. Converting these electrical measurements into meaningful metrics like body fat percentage, muscle mass, and visceral fat level requires sophisticated mathematical models and algorithms. Raxqen Zynoq employs a multi-layered algorithmic approach that combines traditional bioelectrical impedance equations with modern machine learning techniques.

Our algorithm development process began with collecting data from over 15,000 subjects across diverse demographic groups. Each participant underwent both Raxqen Zynoq measurements and gold-standard DEXA scans, creating a comprehensive dataset for algorithm training and validation. This extensive dataset ensures our algorithms perform accurately across different ages, genders, ethnicities, fitness levels, and body types.

Traditional BIA Equations

The foundation of our analysis system is built on well-established bioelectrical impedance equations that have been validated through decades of scientific research. These equations describe the mathematical relationships between measured impedance values and body composition parameters:

Cole-Cole Model

The Cole-Cole model describes how impedance varies with frequency, allowing us to distinguish between intracellular and extracellular water compartments. By fitting measured impedance data to this model, we can extract characteristic parameters that correlate with body composition.

Z(ω) = R∞ + (R0 - R∞) / [1 + (jωτ)^α]

Where Z is impedance, ω is angular frequency, R0 and R∞ are resistances at zero and infinite frequency, τ is characteristic time constant, and α is distribution parameter.

Body Water Estimation

Total body water (TBW) is calculated using validated prediction equations that incorporate impedance measurements with anthropometric data:

TBW = a × (Height² / Impedance) + b × Weight + c × Age + d

Where a, b, c, and d are population-specific coefficients refined through our machine learning optimization process.

Fat-Free Mass (FFM) Calculation

Fat-free mass is derived from total body water using the hydration constant of lean tissue:

FFM = TBW / 0.732

The hydration constant (0.732) represents the average water content of fat-free tissue. Our algorithms adjust this constant based on individual factors for improved accuracy.

Machine Learning Enhancement

While traditional BIA equations provide a solid foundation, Raxqen Zynoq takes accuracy to the next level through machine learning algorithms that learn from our extensive validation dataset. Our ML models identify subtle patterns and non-linear relationships that traditional equations may miss:

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Neural Network Calibration

Deep neural networks analyze the multi-frequency impedance spectrum to identify patterns associated with specific body composition profiles. These networks were trained on paired Raxqen Zynoq and DEXA measurements, learning to minimize the difference between our predictions and DEXA gold-standard results.

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Adaptive Personalization

Our algorithms incorporate individual user data over time, recognizing patterns specific to each person. This means your measurements become more personalized and accurate as the system learns your unique bioelectrical characteristics and body composition trends.

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Outlier Detection

Machine learning models identify and flag potentially erroneous measurements caused by poor electrode contact, improper positioning, or unusual hydration states. This quality control ensures you only receive reliable data and are prompted to remeasure when necessary.

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Continuous Improvement

Our algorithms are updated periodically based on new validation data and research findings. When you connect to the Raxqen Zynoq app, your device receives the latest algorithm updates, ensuring you always benefit from our most accurate measurement capabilities.

Measurement Processing Pipeline

When you step on Raxqen Zynoq, your measurement goes through a sophisticated processing pipeline in just 10 seconds:

  1. Signal Acquisition: Raw voltage and current measurements are captured at all four frequencies through all 8 electrodes, generating over 64 individual impedance data points.
  2. Signal Processing: Digital signal processing filters remove noise and artifacts, ensuring clean impedance measurements. Phase-sensitive detection separates resistance and reactance components.
  3. Quality Assessment: Automated checks verify electrode contact quality, measurement consistency, and signal integrity. Measurements failing quality thresholds trigger user notification.
  4. Cole-Cole Analysis: Multi-frequency impedance data is fitted to the Cole-Cole model to extract characteristic parameters describing tissue properties.
  5. Traditional BIA Calculations: Validated BIA equations calculate initial body composition estimates based on impedance parameters and user profile data.
  6. Machine Learning Refinement: Neural network models adjust and refine initial estimates based on patterns learned from our DEXA-validated training dataset.
  7. Segmental Analysis: Algorithms process electrode-specific data to calculate composition for individual body segments.
  8. Result Compilation: All calculated metrics are compiled, validated for consistency, and formatted for display and app synchronization.

Clinical Validation and Accuracy

Rigorous scientific validation ensures Raxqen Zynoq delivers measurements you can trust.

Our Commitment to Accuracy

At Raxqen Health Technologies, we understand that the value of body composition data depends entirely on its accuracy. Inaccurate measurements can lead to misguided health decisions, ineffective training adjustments, and unnecessary frustration. That's why we've invested extensively in clinical validation to ensure Raxqen Zynoq delivers measurements that healthcare professionals and users can rely on.

Our validation program follows the highest scientific standards, including double-blind study protocols, independent third-party testing, and comparison against gold-standard reference methods. The results consistently demonstrate that Raxqen Zynoq achieves accuracy levels previously only available in clinical and research settings.

Clinical Validation Studies

Primary DEXA Validation Study

Institution: Raxqen Health Research Center in collaboration with Stanford University Medical Center

Sample Size: 2,847 participants

Demographics: Ages 18-85, BMI range 16-45, diverse ethnic backgrounds

Reference Method: Dual-Energy X-ray Absorptiometry (DEXA) - Hologic Discovery W

Key Findings:

  • Body fat percentage: r = 0.982 (p < 0.001), SEE = 1.8%
  • Fat-free mass: r = 0.991 (p < 0.001), SEE = 0.9 kg
  • Total body water: r = 0.987 (p < 0.001), SEE = 0.8 L

Conclusion: Raxqen Zynoq demonstrated excellent agreement with DEXA across all measured parameters, with correlations exceeding 0.98 and low standard errors of estimate.

Multi-Center Reproducibility Study

Institutions: 8 independent research centers across North America and Europe

Sample Size: 1,250 participants

Protocol: Each participant measured 3 times per day for 5 consecutive days

Key Findings:

  • Intra-day coefficient of variation (CV): 0.8%
  • Inter-day coefficient of variation (CV): 1.2%
  • Test-retest reliability (ICC): 0.996

Conclusion: Raxqen Zynoq demonstrates exceptional measurement reproducibility, with minimal variation between repeated measurements. Users can confidently track changes over time knowing that variations in readings reflect true body composition changes, not measurement error.

Visceral Fat Validation Study

Institution: Johns Hopkins University School of Medicine

Sample Size: 856 participants

Reference Method: MRI abdominal fat quantification

Key Findings:

  • Visceral fat correlation with MRI: r = 0.94 (p < 0.001)
  • Sensitivity for detecting elevated visceral fat: 96.2%
  • Specificity for detecting elevated visceral fat: 93.8%

Conclusion: Raxqen Zynoq's visceral fat estimation shows strong correlation with MRI measurements, providing a practical non-invasive method for monitoring this important health indicator.

Athletic Population Study

Institution: United States Olympic Training Center, Colorado Springs

Sample Size: 412 elite and professional athletes

Sports: Swimming, cycling, running, weightlifting, team sports

Key Findings:

  • Maintained accuracy in subjects with very low body fat (< 10%)
  • Accurate muscle mass tracking during training cycles
  • Validated for athletes with high muscle mass and low body fat

Conclusion: Raxqen Zynoq algorithms perform reliably for athletic populations who often fall outside normal body composition ranges, making it suitable for serious athletes and bodybuilders.

Accuracy Comparison: Raxqen Zynoq vs. Other Methods

Measurement Method Accuracy vs. DEXA Cost Convenience Best Use Case
DEXA Scan Gold Standard (Reference) $75-250/scan Clinical setting only Medical diagnosis, research
Hydrostatic Weighing ~97% $40-75/test Specialized facility Research, athletic testing
Bod Pod (Air Displacement) ~96% $35-60/test Specialized facility Sports science, research
Raxqen Zynoq (MF-BIA) 98.2% $149.99 (one-time) Home use, daily Daily tracking, fitness, health
Single-Frequency BIA Scale ~85-90% $30-80 Home use Basic estimation only
Skinfold Calipers ~80-90% $10-30 Requires training Budget option, trained users
BMI Calculation ~60-70% Free Calculator needed Population screening only

Regulatory Certifications and Quality Standards

Raxqen Zynoq meets or exceeds all relevant regulatory requirements for medical measurement devices:

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FDA Cleared

Raxqen Zynoq is FDA-cleared as a Class II medical device (510(k) clearance) for body composition measurement. This clearance confirms our device meets safety and effectiveness standards set by the U.S. Food and Drug Administration.

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CE Marked

Full compliance with European Medical Device Regulation (MDR) requirements. CE marking confirms Raxqen Zynoq meets European health, safety, and environmental protection standards for medical devices.

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ISO 13485 Certified

Our manufacturing facility maintains ISO 13485:2016 certification, the international standard for quality management systems in medical device manufacturing. This ensures consistent production quality and regulatory compliance.

IEC 60601 Compliant

Raxqen Zynoq meets IEC 60601 electrical safety standards for medical electrical equipment, ensuring safe operation under all normal use conditions.

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HIPAA Compliant

The Raxqen Zynoq app and cloud infrastructure are fully HIPAA compliant, ensuring your health data is protected according to U.S. healthcare privacy regulations.

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International Approvals

Additional regulatory approvals from Health Canada, TGA (Australia), and other international regulatory bodies ensure Raxqen Zynoq meets global safety and effectiveness standards.

Complete Technical Specifications

Detailed specifications for the Raxqen Zynoq Smart Body Composition Analyzer.

Measurement Technology

Technology Type Multi-Frequency Bioelectrical Impedance Analysis (MF-BIA)
Measurement Frequencies 5kHz, 50kHz, 250kHz, 500kHz
Number of Electrodes 8 (4 per foot platform)
Electrode Material Medical-grade 316L Stainless Steel
Electrode Configuration Tetrapolar (separate current and voltage electrodes)
Measurement Current < 500 µA AC (safe and imperceptible)
Measurement Time ~10 seconds for complete analysis
Accuracy vs. DEXA 98.2% correlation (body fat percentage)

Weight Measurement

Weight Capacity 400 lbs / 180 kg
Weight Resolution 0.05 lbs / 0.05 kg
Weight Accuracy ±0.1 lbs / ±0.05 kg
Load Sensors 4 high-precision strain gauge sensors
Auto-Calibration Yes (automatic zero calibration)
Units lb, kg, st:lb (selectable)

Body Composition Metrics

Total Metrics Measured 15+ body composition parameters
Body Fat Percentage Range: 3-60%, Resolution: 0.1%
Muscle Mass Range: 10-120 kg, Resolution: 0.1 kg
Visceral Fat Level Range: 1-30, Resolution: 0.5
Body Water Percentage Range: 20-80%, Resolution: 0.1%
Bone Mass Range: 0.5-8 kg, Resolution: 0.1 kg
Basal Metabolic Rate Range: 500-5000 kcal, Resolution: 1 kcal
Metabolic Age Range: 12-90 years, Resolution: 1 year
BMI Calculation Range: 10-60, Resolution: 0.1
Segmental Analysis Legs (left/right), Trunk estimation

Connectivity

Wireless Technology Bluetooth 5.0 Low Energy (BLE)
Bluetooth Range Up to 10 meters (33 feet)
Wi-Fi 802.11 b/g/n (2.4 GHz)
App Compatibility iOS 13.0+, Android 8.0+
Third-Party Integration Apple Health, Google Fit, Samsung Health, Fitbit, MyFitnessPal
Data Sync Automatic via Bluetooth or Wi-Fi
Offline Storage Up to 200 measurements

Power

Battery Type Rechargeable Lithium-ion
Battery Capacity 1500 mAh
Battery Life Up to 12 months (typical use)
Charging Port USB-C
Charging Time ~3 hours (0-100%)
Low Battery Alert Yes (app notification and LED indicator)
Auto Power-Off After 30 seconds of inactivity

Physical Specifications

Dimensions 12.6 × 12.6 × 1.0 inches (320 × 320 × 25 mm)
Weight (Device) 4.4 lbs / 2.0 kg
Platform Material 6mm Tempered Safety Glass
Platform Color Options Arctic White, Midnight Black, Space Gray
Display Hidden LED Display (visible when active)
Display Size 3.5 inches
Anti-Slip Surface Yes (ITO coating technology)
Water Resistance IPX5 (splash resistant)

User Profiles

User Profiles Unlimited (via app)
Auto User Recognition Yes (based on body composition signature)
Guest Mode Yes (weight only)
Baby Weighing Mode Yes (hold-to-weigh function)
Athlete Mode Yes (optimized for athletic body types)
Age Range 10-99 years (body composition); All ages (weight only)

Environmental & Warranty

Operating Temperature 50°F - 104°F (10°C - 40°C)
Operating Humidity 30% - 80% RH (non-condensing)
Storage Temperature 14°F - 140°F (-10°C - 60°C)
Warranty 3 years (limited warranty)
Certifications FDA Cleared, CE Marked, ISO 13485, FCC, IC
Country of Origin Designed in USA, Manufactured in Taiwan

Safety Information

Important safety considerations for using Raxqen Zynoq responsibly.

General Safety Statement

Raxqen Zynoq has been designed, tested, and certified to meet rigorous international safety standards for medical measurement devices. The bioelectrical impedance measurement uses an extremely low-level electrical current that is safe and imperceptible to users. However, certain individuals should exercise caution or avoid using the body composition measurement features.

Important Warnings and Precautions

⚠️ Do Not Use Body Composition Features If You:

  • Have an implanted cardiac pacemaker or defibrillator: The electrical current used in BIA measurement may interfere with the proper operation of implanted electronic medical devices. You may use the weight-only function safely.
  • Have other implanted electronic medical devices: Including insulin pumps, neurostimulators, or cochlear implants. Consult your healthcare provider before using body composition features.
  • Are currently pregnant: While there is no evidence that BIA harms developing fetuses, we recommend avoiding body composition measurements during pregnancy as a precaution. The weight function is safe to use.

⚡ Use With Caution If You:

  • Have artificial joints or metal implants: Metal implants may affect impedance measurements in the affected area, potentially reducing accuracy for segmental analysis. Whole-body measurements are generally still reliable.
  • Are taking medications that affect fluid balance: Diuretics, corticosteroids, and certain other medications can affect body water distribution and may impact measurement accuracy.
  • Have significant edema or fluid retention: Abnormal fluid accumulation may affect body composition calculations. Consult your healthcare provider if measurements seem inconsistent with your physical condition.
  • Have been diagnosed with osteoporosis: Bone mass measurements from BIA are estimates and should not replace clinical bone density testing (DEXA) for osteoporosis diagnosis or monitoring.

📋 For Accurate Measurements:

  • Measure at the same time each day, preferably in the morning before eating or drinking.
  • Stand barefoot on clean, dry feet for optimal electrode contact.
  • Avoid measuring immediately after intense exercise, sauna, or alcohol consumption.
  • Wait at least 2 hours after eating or drinking large amounts of fluid.
  • Maintain a stable standing position for the full 10-second measurement duration.
  • Use the bathroom before measuring for more consistent results.
  • Keep the scale on a hard, flat surface (not on carpet).

Medical Disclaimer

Raxqen Zynoq is intended for general wellness and fitness tracking purposes. The body composition measurements provided are estimates based on bioelectrical impedance analysis and should not be used for medical diagnosis or treatment decisions. Always consult qualified healthcare professionals for medical advice, diagnosis, or treatment.

The device and associated app are not intended to diagnose, treat, cure, or prevent any disease. Changes in body composition measurements should be interpreted as trends over time rather than absolute values. Individual results may vary based on factors including hydration, recent food intake, exercise, and measurement conditions.

If you have concerns about your body composition, weight, or overall health, please consult your physician or healthcare provider for personalized medical advice.

Research and Scientific Publications

Peer-reviewed research supporting our technology and methodology.

Our commitment to scientific rigor is reflected in our ongoing research partnerships and peer-reviewed publications. The following publications provide scientific validation for the technologies and methodologies used in Raxqen Zynoq.

Validation of a Novel Multi-Frequency Bioelectrical Impedance Device for Home Body Composition Assessment

Chen, R.T., Williams, M.K., Patel, S., et al.

Journal of Clinical Nutrition and Metabolism, 2025; 112(4): 892-905

This study validated the Raxqen Zynoq multi-frequency BIA device against DEXA in 2,847 adults. Results demonstrated 98.2% correlation for body fat percentage with a standard error of estimate of 1.8%. The device showed consistent accuracy across age groups, BMI categories, and ethnic backgrounds.

Multi-Frequency Bioelectrical Impedance Analysis: Advantages Over Single-Frequency Methods for Body Composition Assessment

Williams, M.K., Anderson, J.L., Thompson, R.D.

International Journal of Body Composition Research, 2024; 22(2): 156-172

A comprehensive review comparing single-frequency and multi-frequency BIA approaches. The study concludes that multi-frequency methods provide significantly improved accuracy, particularly for distinguishing intracellular and extracellular water compartments, resulting in more precise fat-free mass and body fat estimations.

Application of Machine Learning Algorithms to Improve Bioelectrical Impedance Body Composition Predictions

Patel, S., Chen, R.T., Kumar, A., et al.

IEEE Transactions on Biomedical Engineering, 2025; 72(1): 234-247

This paper describes the development and validation of neural network algorithms for enhancing BIA body composition predictions. The machine learning approach reduced prediction errors by 23% compared to traditional regression equations when validated against DEXA measurements.

Reproducibility and Day-to-Day Variation of Multi-Frequency Bioelectrical Impedance Measurements

Thompson, R.D., Williams, M.K., Garcia, L.M.

Applied Physiology, Nutrition, and Metabolism, 2024; 49(6): 712-720

A multi-center study examining measurement reproducibility of the Raxqen Zynoq device. Results showed intra-day CV of 0.8% and inter-day CV of 1.2%, with test-retest reliability (ICC) of 0.996, demonstrating exceptional measurement consistency for longitudinal tracking.

Visceral Fat Estimation Using Multi-Frequency Bioelectrical Impedance: Validation Against MRI

Anderson, J.L., Chen, R.T., Park, H.S.

Obesity Research and Clinical Practice, 2025; 19(2): 145-158

This study validated visceral fat estimation from the Raxqen Zynoq device against MRI abdominal fat quantification in 856 participants. Results showed r = 0.94 correlation with MRI measurements, with 96.2% sensitivity and 93.8% specificity for detecting elevated visceral fat levels.

Research Partnerships

Raxqen Health Technologies maintains active research collaborations with leading academic and medical institutions worldwide:

  • Stanford University Medical Center
  • Johns Hopkins University School of Medicine
  • MIT Media Lab - Health Technology Group
  • University of Oxford - Sports Medicine Department
  • Tokyo University Hospital - Clinical Nutrition Division
  • Australian Institute of Sport
  • United States Olympic Training Center

Technology Frequently Asked Questions

Get answers to common questions about Raxqen Zynoq technology.

What makes multi-frequency BIA more accurate than single-frequency BIA?

Multi-frequency BIA measures impedance at multiple frequencies (Raxqen Zynoq uses 5kHz, 50kHz, 250kHz, and 500kHz). Different frequencies penetrate tissues differently—low frequencies travel mainly through extracellular water, while high frequencies can penetrate cell membranes to measure intracellular water.

This allows multi-frequency devices to accurately distinguish between different body water compartments and tissues. Single-frequency devices (typically operating at 50kHz only) cannot make this distinction, relying instead on statistical assumptions that reduce accuracy, especially when hydration levels vary.

Clinical studies show multi-frequency BIA achieves 98.2% correlation with DEXA scans, compared to 85-90% for single-frequency devices—a significant improvement in accuracy.

Is the electrical current used in BIA technology safe?

Yes, the electrical current used in Raxqen Zynoq is completely safe for the vast majority of users. The device uses alternating current at less than 500 microamperes—far below the threshold of human perception (typically 1 milliampere) and well within established safety limits for medical devices.

This current level is similar to what's generated naturally by the human body and cannot cause any harm to healthy individuals. The technology has been used safely in clinical and research settings for over 40 years.

However, individuals with implanted electronic medical devices (pacemakers, defibrillators, insulin pumps) should not use the body composition features, as even very low electrical currents could potentially interfere with device operation. These individuals can safely use the weight-only function.

Why does Raxqen Zynoq use 8 electrodes instead of 4?

Raxqen Zynoq uses 8 electrodes (4 per foot) to enable a tetrapolar measurement configuration that dramatically improves accuracy and enables segmental body analysis.

In a tetrapolar configuration, separate electrodes are used for current injection and voltage measurement. This eliminates skin-electrode contact impedance from the measurement—a significant source of error in 4-electrode systems where the same electrodes are used for both functions.

Additionally, the 8-electrode system allows independent measurement of each leg, enabling left-right comparison and identification of muscle development asymmetries. This level of detail is impossible with 4-electrode systems that can only provide whole-body estimates.

How does Raxqen Zynoq's accuracy compare to DEXA scans?

In clinical validation studies comparing Raxqen Zynoq to DEXA (Dual-Energy X-ray Absorptiometry) scans—the gold standard for body composition measurement—our device achieved 98.2% correlation for body fat percentage measurement.

This means Raxqen Zynoq measurements are very close to what you would get from a DEXA scan costing $75-250 per scan at a medical facility. The standard error of estimate (SEE) was 1.8% for body fat percentage, meaning most measurements fall within ±1.8% of the DEXA result.

While no home device can perfectly replicate laboratory-grade DEXA scans, Raxqen Zynoq provides the closest accuracy available for home use, making it an excellent tool for tracking body composition changes over time.

Why might my measurements vary from day to day?

Some day-to-day variation in body composition measurements is normal and expected. Several factors can cause temporary fluctuations:

  • Hydration levels: Being dehydrated or overhydrated affects body water measurements, which in turn affects calculated body fat and muscle mass.
  • Recent food and drink intake: Eating or drinking before measurement adds mass and can temporarily affect results.
  • Recent exercise: Exercise causes temporary fluid shifts that affect measurements for several hours afterward.
  • Time of day: Body water distribution changes throughout the day due to gravity and activity.
  • Menstrual cycle: Hormonal changes can cause fluid retention that affects measurements.

For best results, measure at the same time each day (ideally morning after using the bathroom), under consistent conditions. Focus on trends over weeks rather than daily fluctuations.

How does the automatic user recognition work?

Raxqen Zynoq's automatic user recognition uses your unique body composition "signature" to identify you when you step on the scale. This signature is based on your impedance pattern at multiple frequencies, which is as unique as a fingerprint.

When you create a profile and take initial measurements, the device stores your characteristic impedance pattern. On subsequent measurements, it compares the measured pattern against stored profiles and automatically matches you with your profile within seconds.

This feature works reliably even as your body composition changes over time because the recognition algorithm uses relative impedance patterns rather than absolute values. In rare cases of confusion (such as family members with very similar body compositions), the app will prompt you to confirm your identity.

What is the Cole-Cole model mentioned in the technology description?

The Cole-Cole model is a mathematical model used to describe how biological tissues respond to electrical signals at different frequencies. Named after Kenneth Cole and Robert Cole who developed it in the 1940s, it's a fundamental tool in bioelectrical impedance analysis.

The model describes impedance as a function of frequency, accounting for both resistance (opposition to current flow) and reactance (energy storage by cell membranes). By fitting measured multi-frequency impedance data to this model, we can extract characteristic parameters that describe tissue composition.

Key parameters derived from the Cole-Cole model include R0 (resistance at zero frequency, related to extracellular water), R∞ (resistance at infinite frequency, related to total body water), and characteristic frequency (related to cell membrane properties). These parameters enable accurate calculation of body composition metrics.

Can Raxqen Zynoq measure body fat in different body parts?

Raxqen Zynoq provides segmental analysis for the lower body (left and right legs independently) and estimates for the trunk region. Each leg can be measured separately using the electrodes on each foot platform, allowing you to identify asymmetries in muscle development or fat distribution.

For complete segmental analysis of arms, a device with hand-held electrodes would be required, which Raxqen Zynoq does not include in order to maintain ease of use. However, our algorithms use validated bioelectrical impedance spectroscopy models to estimate whole-body and trunk composition based on lower body measurements combined with your profile data.

The leg-specific analysis is particularly valuable for athletes wanting balanced muscle development, physical therapy patients recovering from injuries, and anyone interested in detailed body composition tracking.

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