46
7. ABOUT HEART RATE DETECTION
Heart rate detection functions are selected at the time of purchase. Not every product
includes every type of heart rate detection device. The following explains factors that
influence the performance of two of the most common types of heart rate detection
devices.
HEART RATE
Telemetry
The words “telemetry heart rate” refer to the detection of heart rate via a device worn
on the exerciser and transmitted over the air to a circuit board built into the product.
Telemetry heart rate devices are commonly worn on the exerciser’s chest, where
the pulse is strongest and relatively easy to detect.
The following explains conditions that affect the performance of the telemetry heart
rate detection in all fitness products.
●
The telemetry heart rate transmitter emits a wireless 5 kHz signal that
is harmless to the human body. Inside the transmitter is a 3-volt battery
(CR2032). If the battery voltage is too low, either the reception distance
shortens or there will be no reception whatsoever.
●
Secure the telemetry heart rate transmitter on your chest so that it stays
in place without making you feel uncomfortable. Moisten the skin for better
contact.
●
Because the telemetry heart rate signal varies in strength from 20 Hz to
20 KHz, environmental interference can block signal reception. Physical
vibration and electronic devices, including stereos, TVs, and even fluores
-
cent lights, can interfere with signal reception. For best results, install fitness
products in an area free from such interference.
● Space fitness products apart by at least 39 inches (100 cm) to avoid hav
-
ing the heart rate value from one exerciser appear on a neighboring fitness
product.
HEART RATE
Contact
The words “contact heart rate” refer to the detection of the heart rate via sensors
on the fitness product. By holding the sensors, the exerciser can view his or her
heart rate on the product display. Like telemetry heart rate, contact heart rate can be
influenced by several factors. The following list includes some of these factors.
● A weak pulse makes it difficult to detect heart rate.
● Low systolic blood pressure makes it difficult to detect heart rate.
●
Dry, course palms impede heart rate detection. For best results, moisten
your palms. But do not apply hand lotion immediately prior to your workout,
because hand lotion can gum up the contact pads.
Heart rate detection devices used on fitness products are not medical de-
vices. Heart rate values are for reference only. Do not use them for medical
diagnostic or treatment work.
