LifeSpan TR5500iM Owner's Manual page 40

Operations
Hand Pulse Sensors
To use, grasp the sensors with a comfortable grip, with the palms of your hands
placed over the sensors. If the sensors are having difficulty picking up your heart
rate, use aloe or a moisturizer on your hands or further warm up as you exercise
to increase the moisture in your hands. Dry hands do not transfer your pulse as
effectively as moist hands.
Chest Strap
All three of the treadmill models covered
in this Owner's Manual have integrated
bluetooth heart rate receivers built into the
console.
The chest strap should be worn as shown.
When using a chest strap you may need to
warm-up first to increase the moisture in your
skin. If this doesn't work, use aloe or another
moisturizer where the sensors on the chest
strap are making contact with your skin.
NOTE:
The heart rate monitoring system will vary due to your age,
method of use, physiology and other factors. LifeSpan cannot guarantee
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the accuracy of the heart rate readings.