Are Activity Trackers Effective in Helping You Reach Your Fitness Objectives?



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As the new year unfolds, numerous individuals embark on fulfilling their resolutions. A common and commendable aim is to increase physical activity.

If your 2024 resolution involves boosting your activity levels, you might have already purchased an activity tracker or are contemplating acquiring one.

But what are the benefits of activity trackers? And will a basic tracker do the trick, or do you need a fancy one with lots of features? Let's take a look.

Why use an activity tracker?

One of the most powerful predictors for being active is whether or not you are monitoring how active you are.

Most people have a vague idea of how active they are, but this is inaccurate a lot of the time. Once people consciously start to keep track of how much activity they do

they often realise it's less than what they thought, and this motivates them to be more active.

You can self-monitor without an activity tracker (just by writing down what you do)

but this method is hard to keep up in the long run and it's also a lot less accurate compared to devices that track your every move 24/7.

By tracking steps or "activity minutes" you can ascertain whether or not you are meeting the physical activity guidelines (150 minutes of moderate to vigorous physical activity per week).

It also allows you to track how you're progressing with any personal activity goals, and view your progress over time.

All this would be difficult without an activity tracker.

Research has shown the most popular brands of activity trackers are generally reliable when it comes to tracking basic measures such as steps and activity minutes.

But wait, there's more

Many activity trackers on the market nowadays track a range of other measures which their manufacturers promote as important in monitoring health and fitness. But is this really the case?

Let's look at some of these.

Resting heart rate

This is your heart rate at rest, which is normally somewhere between 60 and 100 beats per minute.

Your resting heart rate will gradually go down as you become fitter, especially if you're doing a lot of high-intensity exercise.

Your risk of dying of any cause (all-cause mortality) is much lower when you have a low resting heart rate.

So, it is useful to keep an eye on your resting heart rate.

Activity trackers are pretty good at tracking it, but you can also easily measure your heart rate by monitoring your pulse and using a stopwatch.

Heart rate during exercise

Activity trackers will also measure your heart rate when you're active.

To improve fitness efficiently, professional athletes focus on having their heart rate in certain "zones" when they're exercising so knowing their heart rate during exercise is important.

But if you just want to be more active and healthier, without a specific training goal in mind, you can exercise at a level that feels good to you and not worry about your heart rate during activity.

The most important thing is that you're being active.

Also, a dedicated heart rate monitor with a strap around your chest will do a much better job at measuring your actual heart rate compared to an activity tracker worn around your wrist.

Maximal heart rate

This is the hardest your heart could beat when you're active, not something you could sustain very long.

Your maximal heart rate is not influenced by how much exercise you do, or your fitness level.

Most activity trackers don't measure it accurately anyway, so you might as well forget about this one.



Your muscles need oxygen to work.

The more oxygen your body can process, the harder you can work, and therefore the fitter you are.

VO₂max is the volume (V) of oxygen (O₂) we could breathe maximally (max) over a one minute interval, expressed as millilitres of oxygen per kilogram of body weight per minute (ml/kg/min).

Inactive women and men would have a VO₂max lower than 30 and 40 ml/kg/min, respectively.

A reasonably good VO₂max would be mid thirties and higher for women and mid forties and higher for men.

VO₂max is another measure of fitness that correlates well with all cause mortality:

the higher it is, the lower your risk of dying.

For athletes, VO₂max is usually measured in a lab on a treadmill while wearing a mask that measures oxygen consumption.

Activity trackers instead look at your running speed (using a GPS chip) and your heart rate and compare these measures to values from other people.

If you can run fast with a low heart rate your tracker will assume you are relatively fit, resulting in a higher VO₂max.

These estimates are not very accurate as they are based on lots of assumptions.