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Heart Rate
Variability (HRV),
Heartbeats, and
Autonomic Nervous
System (ANS)
You are at the official
site of
ANSWatch - a
multi-functional wrist
ANSWatch Standard
- Combining functions of ECG and Blood Pressure Measurements into one Integrated
Portable Device
Device Main Functions - ANSWatch Standard Wrist Monitor

  • Sensor technology: ANSWatch Standard wrist monitor employs a proprietary
    sensor array embedded in the wrist cuff to measure radial arterial waveforms.  These
    special type sensors focus on the detection of the primary peak of each radial pulse.  
    From arterial waveforms, the peak-to peak intervals are obtained.  Heart rate variability
    (HRV) analysis is then conducted on both time-domain and frequency-domain bases.  
    Irregular heartbeats (including cardiac arrhythmias) are auto detected, reported, and
    excluded from HRV analyses.  In addition, a high-precision pressure gauge is used for
    measurement of blood pressures (systolic and diastolic) based upon the standard
    oscillometric algorithms.

  • Testing posture and condition: ANSWatch Standard wrist monitor is to be worn
    on the left wrist.  Patients are lying down or sitting during testing.  A rest period of at
    least 10 minutes is needed before test.  During test, patients should not talk or move.

  • Connection to PC: ANSWatch Standard is operated by the six buttons on the
    device panel and is not connected to a PC during test or after test.  Test data (including
    irregular pulse waveforms and up to 50 sets) are stored in ANSWatch Standard's on-
    board memory which can be viewed on the device's LCD screen

  • Standard Test (BP, HRV, and irregular heartbeats):  the standard test
    measures blood pressures, heart rate variability HRV, and irregular heartbeats.  The
    test lasts for 7 minutes.  Patient parameters measured include systolic pressure,
    diastolic pressure, heart rate, HRV (total ANS activity index), LF% (sympathetic activity
    index), HF% (parasympathetic activity index), LF/HF (sympathetic / parasympathetic
    ratio), and number of irregular heartbeats (in 5-min). During test, messages,
    instructions, and pulse waves are displayed on the LCD screen.  

  • BP Test (skipping HRV and irregular heartbeat tests): the BP test  is a
    shortened test that only measures systolic pressure, diastolic pressure, and heart rate  

  • Real-time Test (user defined test period): the real-time test allows users to
    specify the test period (maximum 20 minutes each test). During test, heart rate and
    HRV are displayed on LCD at 10-sec intervals for their current (real-time) values.  The
    test is particularly suitable for recording transitory effects.

  • Physical dimension: Length 10 cm x width 7 cm x thickness 10 cm
  • Weight: 215 g
  • Power: rechargeable lithium battery
  • Charge time: 4 hours
  • Battery capacity: 700 mA*Hr (more than 10 tests per full charge)
  • Display: LCD (4 cm x 7 cm)
  • Battery Charge: Mini-USB to PC's USB port, or wall power adapter
  • Blood pressure range and accuracy: 50-180 mmHg (+- 8 mmHg)
  • Heart rate range and accuracy: 40-250 beat/min (+- 1 beat/min)
  • HRV range and accuracy: 0-999 ms (+- 5%)
  • HF% range and accuracy: 0-100% (+- 5%)
  • LF% range and accuracy: 0-100% (+- 5%)
  • LF/HF range and accuracy: 0-999 ((+- 5%)
  • Number of irregular heartbeats: 0-999
  • Patient parameters measured: Systolic Pressure, Diastolic Pressure, Heart Rate, Heart
    Rate Variability (HRV), High Frequency Component (HF%), Low Frequency
    Component  (LF%), LF/HF, Number of Irregular Heartbeat
  • Operating environment: temperature (15 to 40 degree C); humidity (20% to 99%);
    indoor use.
Targeted Customers

ANSWatch Standard Wrist Monitor is most suitable for the following
  • General public for self health monitoring at home without a PC (cardiac arrhythmias,
    dysautonomia, hypertension, hypotension, palpitation, anxiety / depression / panic
    disorder, metabolic syndrome, diet, exercise, and music therapy, Yoga / Qi)
  • Patients under the supervision of physicians for frequent home testing with test data
    communicated verbally to physicians (health status, treatment progress, side effects)
  • Teaching hospitals, universities, and HRV research groups who conduct clinical studies
    where a large group of patients are recruited for frequent home testing

  • ANSWatch products are sold with a two-year (24-month) limited warranty (except for
    the bio-sensor module and the lithium battery, both carrying one-year (12-month)
    warranty). Within the warranty period, if your product does not work properly because
    of a defect in materials or workmanship, we will repair your product with new or
    refurbished parts or replace it with a new or a refurbished product. Customers should
    contact Sun Scientific Corporation by e-mail at or their sales
    representative first to arrange for carry-in or mail-in service. There will be no charge for
    labor or parts. The limited warranty does not cover normal wear, mechanical damage,
    or water damage. Warranty is invalidated if the product cover fixed by screws has been
    opened. Product repair with a charge is available for work not covered in the warranty.
    Contact us or your sales representative for details.
Clincal Trials / Studies

  • Large Animal Study Team
University of Utah, SLC, Utah
J. Clark, Ph.D., Professor
E. Jones, M.D., Anesthetist
G. Billings, Ph.D., Research Associate
M. Criddle, Ph.D., Research Associate
G. Burns, V.M.D., Professor

  • Human Clinical Trial Team (1)
Lynn Health Science Institute
Oklahoma University Health Sciences Center
William C. Orr PhD,President and CEO, Clinical
Professor of Medicine

  • Human Clinical Trial Team (2)
Performance and Longevity Center
Salt Laky City, Utah
Carl Kent Hebdon, M.D. ,M.S. President and CEO

  • Human Clinical Trial Team (3)
Tzu-Chi Hospital, HuaLen, Taiwan
T. Kuo, M.D., Ph.D., Professor
J.L. Chen, M.D., Interist
J.H. Yang, Ph.D., Professor
Y. S. Liu, Research Assistant

  • Human Clinical Test Team (4)
Tri-Service General Hospital, Taipei, Taiwan
W.M. Chi, M.D., Ph.D., Director, Professor
Y.F. Lin, M.D., Internist, Ph.d., Director, Professor
T. C. Yen, M.D., Internist
L. Pai, Ph.D., Professor
L. Liang, Director
G.B. Chang, Director
S.H. Tong, Research Assistant

  • Small Animal Study Team
Academia Sinica, Taipei, Taiwan
W.K. Wang, Ph.D., Research Fellow, Professor
T.L. Hsu, Ph.D., Research Associate
I. Chiang, Research Assistant
ANSWatch Journal   
and Conference

*Wen Chieh Liang,  John Yuan, Deh Chuan
Sun, Ming Han Lin, Changes in
Physiological Parameters Induced by
Indoor Simulated Driving: Effect of Lower
Body Exercise at Mid-Term Break,
Sensors 2009, 9, 6913-6933

*Liang, W.C., Yuan, J.,Sun, D.C., Lin,
M.H., Changes In Physiological Parameters
Induced By Simulated Driving Tasks:
Morning Vs. Afternoon Session,  J. Chin.
Inst. of Industrial Eng., 25(6), 457-471,

*Wen Chien Liang, John Yuan, D.C. Sun,
Ming Han Lin, Variation in Physiological
Parameters Before and After an Indoor
Simulated Driving Task: Effect of Exercise
Break, 2007 International Conference on
Gerontic Technology and Service
Management (ICGTSM), Nantou County,
Taiwan, March-26-2007

*Wen Chien Liang, John Yuan, D.C. Sun,
Ming Han Lin, Variation in Physiological
Parameters Before and After a Simulated
Driving Task (Part 2) The 14th Annual
Meeting, Ergonomics Society of Taiwan,
March 31, 2007 / Wufong, Taichung County

*Wen Chien Liang, John Yuan, D.C. Sun,
Ming Han Lin, Variation In Physiological
Parameters Before And After An Indoor
Simulated Driving Task In The Afternoon,
2006 Biomedical Engineering and
Technology Conference, Taichung, Taiwan

*D.C. sun, Y.I. Kuo, Y.H. Liang,  S. H.
Tang, Y.F. Lin, Y.H. Chang, J.K, Lin,  
Introduction to a New Wrist Patient Monitor
- ANSWatch and its Clinical Applications,  
9th Conference on Engineering Technology
and Applications of Chinese and Western
Medicine, Taichung, Taiwan, Conference
Proceeding, Page 33-38

More than 10  Ph.D. and M.S. theses
have been published
DEMO- ANSWatch Standard: Standard Test (measurement
of blood pressures, HRV, and irregular heartbeats)
Play a demo-video for a typical standard test
on ANSWatch Standard on a new window
Comparison Among Pro, Deluxe, and Standard Models of
ANSWatch Wrist Monitor
Connection to PC
Yes (both during test and
data download / post
Yes (only for data
download / post-analysis;
not during test)
Blood pressures
Systolic, diastolic, and
mean blood pressures
Systolic and diastolic
Systolic and diastolic
Heart rate
Heart rate variability HRV
HRV (or SDNN), LF, LF%,
HF, HF%, VLF, LF/HF, and
other related parameters
HRV (or SDNN), LF, LF%,
HF, HF%, VLF, LF/HF, and
other related parameters
HRV (or SDNN), LF%,
Irregular heartbeats
Yes (auto detected and
displayed on both LCD
screen and PC monitor)
Yes (auto detected and
displayed on both LCD
screen and PC monitor)
Yes (auto detected and
displayed on LCD screen)
Arterial waveforms
Precise and detailed
Focus on the primary peak
with less details
Focus on the primary peak
with less details
Analysis of arterial
Calculation of biological
Yes (based upon the
clinical database
condensed from the public
and private test data)
Yes (based upon the
clinical database
condensed from the public
and private test data)
Detection of arterial
Detection of mitral valve
Autonomic Nervous
System Test Report
Pulse Analysis Test
Report (for Chinese
Medicine Doctors)
Cardiovascular System
Test Report
Test raw data storage
Yes (in PC's memory with
standard data format )
Yes (in PC's memory with
standard data format )
Upload test data to
Google Health
Free customer service
for interpretation of test
Yes (up to 10 tests per
customer per device by
here is how)
Yes (up to 10 tests per
customer per device by
here is how)
Yes (up to 10 tests per
customer per device by
here is how)
DEMO- ANSWatch Standard: Various types of irregular
Body movement or cough (not
cardiac arrhythmias)
Premature contraction followed
by delayed contraction
Uneven ventricular contraction
Delayed ventricular contraction
ANSWatch customers
(professionals and
individuals) for
experience sharing and
in-depth discussions at  
(click to enter)
Do you have     
- are you monitoring   
- are you taking
prescription drugs?
- are you aware of drug
side effects on ANS?
- self-improvement tips
Read more......
Feeling dizzy      
or even fainted?
- are you low in blood
pressure or heart rate?
- are you taking
prescription drugs?
- You may experience
Baroreflex failure
Read more......
Irregular heartbeats?
- often noticing abnormal
heartbeats (missing,
uneven, or super-fast)?
- Yo might have cardiac
- Most sudden death
events are preceded by
irregular heartbeats
Read more......
Mitral Valve Prolapse?
bicuspid valve between left
atrium and ventricle
- If mitral valve is not
closed properly (called
mitral valve prolapse
MVP), the blood may
backflow during pumping
- there is a strong
connection between panic
attackes and MVP
- How to detect it?
Read more......
Am I having   
- autonomic nervous
system works to fine tune
body conditions depending
on physiological needs
- ANS consists of two
branches: sympathetic and
- do you have balanced
- what are the symptoms of
Read more......