The Pros And Cons Of Wrist Based Heart Rate Monitors
Pros
Convenient.An obvious pro for wrist-based monitors is their convenience. There are no straps you need to wear, wash and maintain. This simplicity makes using them easy and improves consistency in their use.
Comfort.Because wrist-based monitors are baked right into your watch, they’re usually more comfortable to use than a strap.
Accurate At Low Intensity.One of the big cons I hear of wrist-based monitoring is their accuracy. From my experience, this is not the case, although that comes with a caveat.
Atlow-intensity, wrist-based monitors seem to be fairlyaccurate. We do a lot of testing inour labusing a chest strap. Often, athletes use their wrist-based monitors at the same time. In my experience of witnessing hundreds of tests like this, wrist-based monitors prove to be accurate.
Running watches with wrist-based monitors are usually within 1 to 2 beats of the strap. Well-known fitness trackers like Fitbit and Apple Watch are usually within 2 to 3 beats of the strap.
Cons
Inaccurate.As I mentioned in the pros list, wrist-based monitors are fairly accurate at low intensity. Unfortunately, this does not seem to be the case when you increase the intensity.
In the later stages of our testing when the athletes are working hard, the numbers begin to show a different picture. Instead of being out by between 1 to 3 beats, they’re often out by upwards of 5bpm. I have seen many off by as much as 20bpm.
This has also been my experience in my own training where my heart rate numbers are skewed as I up the pace.
Placement And Tightness.The placement and tightness of the strap on a wrist-based monitor are very important for its ability to measure your heart rate accurately. I suspect this is part of the reason for their lack of accuracy at higher intensity.
If you place them correctly and do them up as tight as they need to be for accuracy, they become uncomfortable. As such, most athletes are wearing them too loosely and as the intensity goes up and the arms begin to move more aggressively, the monitor begins to move about and lose its accuracy.
Forearm Tension.If you use a wrist-based monitor and do an exercise where the tension in your forearm changes (think strength exercises), you’ll often see very different readings to what you will see from a chest strap.
Unreliable.Because of all of the above, wrist-based monitors don’t typically lend themselves to reliable and consistent heart rate monitoring.
The Pros And Cons Of Heart Rate Chest Straps
Pros
Accurate.When compared with wrist-based monitors, chest straps are more accurate at low intensity and at high intensity. This is a very important consideration if you’re serious about achieving the best results possible from your training.
I would suggest you place a higher importance on this than on some of the other pros and cons on the list.
Reliable & Consistent.A chest strap is more accurate and therefore it is more reliable and consistent too. Heart rate always has a lag but with a strap, it limits the lag you see on your monitor and it makes interpreting the numbers while running easier than a wrist-based monitor.
Cons
Comfort.While I have comfort down as a con, this is not always the case. Comfort – or discomfort rather – is the main pain point I hear from athletes when talking about chest straps. This has not really been a con in my own experience. So long as you have a good quality strap and you wear if often, you tend to forget you’re even wearing it.
Maintenance.The downside to a strap is that you have to clean it after each run to keep it in good working order. This can be a bit of hassle but could be worth it for the extra accuracy it offers.
You May Forget It.Because a strap is an additional piece of equipment, there’s a chance you leave it behind when you pack your gear.
Pairing Issues.While uncommon, sometimes you can experience pairing issues when trying to connect your strap to your monitor. This is not something I have personally had much of an issue with but it does happen.
In Closing
While there is no right or wrong choice per se, it is worth considering the above points when making a decision regarding whether to use a chest strap or a wrist-based monitor.
If you’re doing a lot of high-intensity training or are looking for accuracy, a chest strap is definitely the way to go.
If most of your training is at a low intensity or convenience outweighs accuracy, a wrist-based monitor may be a good option.
I personally mix it up.I’ll often use a wrist-based monitor for my easy or less important runs. For more important runs and for hard sessions and races, I will always connect and use a chest strap.
