- Model NO.:S3
- Calories burned
- Sleep time
- Heart rate
- Wrist skin temperature
- Wrist humidity
- Wrist temperature
- Barometric pressure/Altitude
Steps, means the steps counted during walking and running.
Steps are calculated by the 3-axis acceleration sensor in the
Hesvitband. It may differ a little bit from the actual steps.
Steps are counted from 24:00 to 24:00 the next day.
WHO suggests that an adult should walk 10,000 steps per day. When
your steps reach an integral multiple of 10,000, the screen will
flash 10s, to congratulate you on achieving the health requirement.
Mileage, means the distance you've walked and run that day.
Mileage is calculated according to the walking and running steps.
Meanwhile, it is related to the individual's height (set in "my
profile"). It may differ a little bit from the actual mileage.
Mileage is calculated from 24:00 to 24:00 the next day.
Exercises burned calories, only means the calories burned during
exercises, not including basal metabolism. Person daily burned
calories contain exercises burned calories and basal metabolism.
Basal metabolism, means the minimum energy demanded by organs to
keep the body functioning at rest. It is the energy metabolism at
rest, not affected by muscular activity, environment temperature,
food and mental state. It varies by age, weight and physical
Exercises burned calories are calculated according to the linear
relationship between speed and calories. The speed is obtained via
the calculated steps and mileage.
Calories burned are calculated from 24:00 to 24:00 the next day.
The more calories burned, it shows the more exercises you've done.
It's a sign of good health.
Sleep time, means sleep hours. Sleep contains deep sleep, light
sleep and awake moments.
Hesvitband analyses the body activity intensity according to the
data from 3-axis acceleration sensor per minute. Based on the
activity intensity, it determines the sleep state in current
minute: deep, light or awake. It further calculates the sleep start
time, sleep time and awake moments according to the sleep state per
minute. When Hesvitband is put aside, it does not calculate the
sleep. Errors may occur in determining the sleep state, such as sit
still, hold one position for a long time, etc.
Sleep time is calculated from 18:00 to 18:00 the next day.
Calculated sleep time means the displayed sleep hours. It may delay
20-30 minutes, which is normal.
Usually, the sleep time varies by age: 5-7 years: 15 hours; 8-12
years: 10 hours; 13-18 years: 9 hours; 19-59 years: 7-8 hours;
above 60 years: 5.5-7 hours. Besides, the best time to sleep is
suggested from 22:00-6:00. For seniors, it's 21:00-5:00 and for
children, 20:00-6:00. In addition, people feel refreshed when their
deep sleep reaches 4 hours. Otherwise, they get exhausted easily.
IV. Physical Signs
Heart rate refers to the number of heartbeats per minute. Normally,
it ranges from 60-100 bpm , which varies by age, gender, diet,
emotion or other physiological factors and external conditions. In
general, the younger has a higher heart rate, the elderly has a
lower heart rate and female has a higher heart rate than their male
counterparts. The normal adult human heart rate is 60-100 bpm.
Ideal heart rate is 55-70 bpm (athletes tend to have lower heart
rates, usually 50 bpm).
Resting heart rate is the number of heartbeats per minute at total
rest. It is found that the changes in resting heart rate over time
are related with the death rate due to heart disease. In general,
within the normal range, the resting heart rate is: the lower, the
better. Ways to lower the resting heart rate are to exercise and to
Maximum heart rate is the highest heart rate an individual can
achieve without severe problems through exercise stress. Current
prevailing calculation formula is: HRmax=220 – Age.
Target heart rate is the safe range for how fast your heart should
beat while you exercise, to improve the aerobic endurance level for
cardiovascular system. Current prevailing calculation formula is:
Target heart rate range=(HRmax-HRrest) x 0.6 + HRrest ~~
(HRmax-HRrest) x 0.8 + HRrest. For example, a man ages 22 with
HRrest of 68, his target heart rate range is:
((220-22)-68)x0.60+68=146~~((220-22)-68)x0.80+68=172, that is,
Normally, heart rate increases immediately after exercise and
decreases fast after exercising stopped, that is, heart rate
recovery time is quite short. For some person, the heart rate
increases slowly and decreases also slowly. This should be cared
Heart rate is obtained by measuring the pulse. With the
photoelectric reflection sensor, it obtains the wrist blood pulse
signal. The blood pulse is consistent with the heart rate.
To measure the heart rate accurately, wear the Hesvitband tightly
around a bare wrist about 2cm above the wrist joint. Heart rate
test may fail in the following situations: 1) Improper wearing of
the Hesvitband; 2) Too large space between the Hesvitband and your
wrist; 3) Too large amplitude of the arm swings, e.g., during
running or walking.
Heart rate tests automatically on the hour, such as 1:00, 2:00,
etc. Total 24 times a day. Or, press and hold button for more than
2s until "--" besides " " flashes. Release the button. It starts to
test heart rate.
When heart rate exceeds 100bpm, the screen will flash for 10 sec to
remind the heart rate is high.
6.Wrist skin temperature
Wrist skin temperature means the temperature on wrist skin. Body
temperature varies on different parts of the body and from person
to person and even at different time of the day.
Wrist skin temperature is measured by the temperature sensor.
Temperature sensor is usually a resistive sensor. The resistance
changes with the wrist skin temperature. Ideal resistance changes
linearly with the temperature. This linear relationship is used to
analyze the wrist skin temperature.
Same as the heart rate, the wrist skin temperature tests and saves
automatically on the hour, such as 1:00, 2:00, etc. Total 24 times
a day. Or, press and hold button for more than 2s until "--"
besides " " flashes. Release the button. It starts to test and
Temperature varies on different parts of the body. Head temperature
is generally higher than foot temperature. Take forearm for
example. Normally, forearm temperature is 1℃ lower than axillary
temperature. Body temperature can thus be inferred. It is found in
a comfortable environment, the average skin temperature is 33.8℃,
with a mean deviation of 0.6℃.To maintain a comfortable average
skin temperature is an important condition to ensure human thermal
V. Environment Parameters
Wrist humidity means the humidity of the air between wrist and
Hesvitband. It is different from environment humidity, and is
affected by both wrist skin humidity and environment humidity.
Wrist humidity is obtained according to the change of the
electrical signal, which is converted from the amount of humidity
by the temperature & humidity sensor.
Wrist humidity is tested automatically on the hour, such as 1:00,
2:00. Totally, 24 times a day.
At a given temperature in a given volume, the less water vapors
present in the air, the drier the air is. On the contrary, the more
water vapors in the air, the moister the air is. Most comfortable
humidity is 50%-70%.
When wrist humidity becomes extremely high, e.g., 80%-95%, it
indicates the user is sweating. When wrist humidity is too low, the
skin becomes dry, rough, peeling, which indicates the water content
of the cuticle is dropping.
According to the changes of wrist humidity, users can find out the
nursing method suitable for themselves, like strengthening the skin
care, adjusting the structure of diets and drinking more water.
Wrist temperature means the temperature of the air between wrist
and Hesvitband. It is different from environment temperature, and
is affected by both wrist skin temperature and environment
Wrist temperature is obtained according to the change of the
electrical signal, which is converted from the amount of
temperature by the temperature & humidity sensor.
Wrist temperature is tested automatically on the hour, such as
1:00, 2:00. Total 24 times a day.
When the difference between skin temperature and wrist temperature
exceeds 4℃, the screen will flash for 10s, to remind the users to
keep warm in cold days.
The most comfortable environment temperature in summer ranges 23-28
°C and in winter 18-25 °C. When environment temperature is above
the upper limit of the comfortable temperature, people feel so
warm. When it's above 37°C, people feel too hot. Usually, the
maximum temperature humans can withstand is 52°C. On the contrary,
when environment temperature is under the lower limit of the
comfortable temperature, people feel cool and cold. When it’s under
0°C, people feel freezing.
Barometric pressure is the air pressure per unit area. It is equal
to the weight of the vertical air column extended upward to the
aeropause above the unit area.
Altitude is the vertical distance of a location above sea level.
The barometric pressure is measured by barometric pressure sensor.
The altitude is calculated according to the barometric pressure
value. The conversion formula between barometric pressure and
altitude is: Altitude (meter) = (1013-Barometric pressure) x 10.
There is a small deviation in the altitude calculated from
barometric pressure, because the barometric pressure is affected by
both environment temperature and humidity.
Barometric pressure tests automatically on the hour, such as 1:00,
2:00. Total 24 times a day.
Most comfortable barometric pressure is 1bar, that is, 1013mbar. On
the airplane, the cabin is pressurized, so with the barometric
pressure in the range of 700-900mbar, people feel comfortable.