Running Dynamics
You can use your compatible Garmin device paired with the HRM-Pro Plus accessory to provide real-time
feedback about your running form.
The HRM-Pro Plus has an accelerometer that measures torso movement in order to calculate six running
metrics.
NOTE: To use the running dynamics features, the HRM-Pro Plus accessory must be paired to your compatible
Garmin device using ANT+ technology. For more information, see your owner's manual.
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.
Running Pace and Distance
The heart rate monitor calculates your running pace and distance based on your user profile and the motion
measured by the sensor on every stride. The heart rate monitor provides running pace and distance when GPS
is not available, such as during treadmill running. You can view your running pace and distance on your
compatible Garmin device when connected using ANT+ technology. You can also view it on compatible third-
party training apps when connected using Bluetooth technology.
Heart Rate While Swimming
The heart rate monitor records and stores your heart rate data while swimming. Heart rate data is not
transmitted to paired Garmin devices while the heart rate monitor is underwater.
You must start a timed activity on your paired Garmin device to view stored heart rate data later. During rest
intervals when out of the water, the heart rate monitor sends your average and maximum heart rate for the
previous interval, and your real-time heart rate, to your Garmin device.
NOTE: To record heart rate data while swimming, your HRM-Pro Plus accessory must be paired to your
compatible Garmin device using ANT+, rather than Bluetooth technology. Only some Garmin devices support
heart rate data while swimming. For more information, see your owner's manual.
Your Garmin device automatically uploads stored heart rate data when you save your timed swim activity. Your
heart rate monitor must be out of the water, active, and within range of the device (3 m) while data is uploaded.
Your heart rate data can be reviewed in the device history and on your Garmin Connect account.
Pool Swimming
NOTICE
Hand wash the heart rate monitor after exposure to chlorine or other pool chemicals. Prolonged exposure to
these substances can damage the heart rate monitor.
The HRM-Pro Plus accessory is designed primarily for open water swimming, but it can be used occasionally for
pool swimming. The heart rate monitor should be worn under a swim suit or triathlon top during pool swimming.
Otherwise, it may slide down your chest when pushing off the pool wall.
Heart Rate Monitor Instructions
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