Polar RS400 Heart Rate Monitor – A Review
The Polar RS400sd is the perfect heart rate monitor for runners that want to improve their perfomance through the use of science in their training. 
The Polar RS400 has one of the largest displays on the market. It also can measure your running speed and distance to help you with your training.
The Polar RS400sd heart rate monitor measures heart rate, running speed, and distance. Of course it also calculates other things like calories burned, time in different heart rate zones and much more.
Here are some of the function of this heart rate monitor:
Batteries
Polar has finally made sure it is possible for you to change the batteries in this heart rate monitor. You don’t have to go to a watch store to have it done any more.
Polar OwnOptimizer
This is a function that only Polar heart rate monitors have. It makes it possible to monitor if you are over training or under training. The heart rate variability is used to calculate the index of the current training load.
Polar Running Index
This is a function only available in the new Polar RS series. The Running Index takes into account your running speed in comparison to your heart rate. Through reviewing your Running Index over a period of time you can see your increase in performance and fitness.
Polar OwnIndex
Polar has found out that resting heart rate tests can calculate your approximate VO2 max. They have done a lot of tests on different persons to validate and design this test. The Polar rs400sd includes a possibility to view the fitness trend graphically.
Polar OwnZone
Polar OwnZone is a function that let’s you calculate your own training zone intensities automatically. The training zone will generally be about 65 – 85 % of Max HR.
Polar OwnCal
This is the well known calorie expenditure calculation that almost all Polar heart rate monitors have.
Difference to RS800
The main differences to the RS800 are stride length, running cadence and altimeter. These functions are all found in the rs800 but not in the rs400.
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