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Tips for Erratic Heart Rate Data
If the heart rate data is erratic or does not appear, you can try these tips.
• Reapply water to the electrodes and contact patches (if applicable).
• Tighten the strap on your chest.
• Warm up for 5 to 10 minutes.
• Follow the care instructions (
Caring for the Heart Rate Monitor, page 39
).
• Wear a cotton shirt or thoroughly wet both sides of the strap.
Synthetic fabrics that rub or flap against the heart rate monitor can create static electricity that interferes
with heart rate signals.
• Move away from sources that can interfere with your heart rate monitor.
Sources of interference may include strong electromagnetic fields, some 2.4 GHz wireless sensors, high-
voltage power lines, electric motors, ovens, microwave ovens, 2.4 GHz cordless phones, and wireless LAN
access points.
Caring for the Heart Rate Monitor
NOTICE
A buildup of sweat and salt on the strap can decrease the ability of the heart rate monitor to report accurate
data.
• Rinse the heart rate monitor after every use.
• Hand wash the heart rate monitor after every seven uses or one pool swim, using a tiny amount of mild
detergent, such as dishwashing liquid.
NOTE: Using too much detergent may damage the heart rate monitor.
• Do not put the heart rate monitor in a washing machine or dryer.
• When drying the heart rate monitor, hang it up or lay it flat.
Running Dynamics
You can use your compatible Descent device paired with the HRM-Run
™
accessory or other running dynamics
accessory to provide real-time feedback about your running form.
The running dynamics accessory has an accelerometer that measures torso movement in order to calculate six
running metrics.
Cadence: Cadence is the number of steps per minute. It displays the total steps (right and left combined).
Vertical oscillation: Vertical oscillation is your bounce while running. It displays the vertical motion of your
torso, measured in centimeters.
Ground contact time: Ground contact time is the amount of time in each step that you spend on the ground
while running. It is measured in milliseconds.
NOTE: Ground contact time and balance are not available while walking.
Ground contact time balance: Ground contact time balance displays the left/right balance of your ground
contact time while running. It displays a percentage. For example, 53.2 with an arrow pointing left or right.
Stride length: Stride length is the length of your stride from one footfall to the next. It is measured in meters.
Vertical ratio: Vertical ratio is the ratio of vertical oscillation to stride length. It displays a percentage. A lower
number typically indicates better running form.
Heart Rate Features
39
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