
Originally Posted by
RedBaron
The ones that you hang on to (attached to the cardio equipment) have a few problems inherent to their design. One is how tightly you grip them. Try it sometime. Hold it loosely then grab it tightly and watch the change in the reading. Keeping a constant pressure on the sensor is sometimes tough while you are trying to do cardio.
The other thing is how many people use them daily and keeping them maintained in a gym environment. If you had a $10,000 life fitness treadmill or bike at home and were the only one using it, it would probably be great. But at the gym, you can get different readings from the same exact exercise done in exactly the same way. I have rotated around machines just to check them out in a couple of gyms. Sometimes the readings are pretty close, sometimes they vary by a large percentage.
Once one of the machines consistantly said that my heart rate was 62 doing 4.8 miles an hour at 12.5 % incline. I switched machines and then the next one said 128. I checked a third machine and it said 119, but when I took my hands completely off the sensor it would jump from 126 to blank without holding on at all.
The reason for your own strap on heart monitor is to get some sense of consistancy. As you can see by the example above, it is pretty hard to figure out where you are really at when relying on the cardio equipment supplied monitors....you have to take what machine is available, so unless you want to learn and remember the nuances to all 50 -100 machines in the gym and how they relate to reality, a monitor is a good investment IMO.