Valentina Palladino

Health tech firms, significantly Fitbit and Garmin, need to monitor the extent of oxygen in your blood. It is a metric that would assist spot indicators of sleep apnea and different breathing-related issues, so firms have been scrambling to good their SpO2 sensors and incorporate this information into their ecosystems in a significant manner.

Fitbit nonetheless hasn’t activated its SpO2 screens in its wearables (though that characteristic ought to roll out in beta in November), however Garmin has. Its latest health tracker, the $129 Vivosmart four, consists of an SpO2 monitor and measures Physique Battery, which helps you to know when it is best to plan your subsequent intense exercise session and when it is best to take a relaxation day.

These two options, along with an all-new design and an reasonably priced value, try and push the Vivosmart four above the remainder of the health tracker crowd. As we noticed with Fitbit’s Cost three, trackers have fallen right into a boredom lure as of late, so firms are looking for distinctive methods to seize the eye of potential prospects who aren’t totally offered on smartwatches. Whereas Garmin achieves a sure stage of differentiation with the Vivosmart four, it is unlikely that everybody who prefers health bands to smartwatches will gravitate towards this machine.


Garmin constantly one-ups itself when it redesigns wearables from scratch. The Vivosmart four is leaps and bounds extra enticing than the Vivosmart three, which was an unnecessarily cumbersome band. Garmin shaved off 3mm from the brand new machine’s width and practically 1mm from its thickness. That, mixed with the flippantly textured silicone band, the brand new zero.26×zero.70-inch OLED show, and the putting aluminum bezels, make the Vivosmart four really feel like a completely completely different machine, reasonably than simply the following within the Vivosmart line.

It is probably the most snug Garmin machine I’ve ever worn due to the up to date design and its new zero.6-ounce weight. Until you safe the band too tightly round your wrist, you will not really feel the Vivosmart four while you’re carrying it. Because it’s protected to swim and bathe with, you might overlook it is on while you go to do one or each of these actions.

However just like the Vivosmart gadgets to come back earlier than it, the Vivosmart four’s module is stationary in the course of the continual piece of silicone that makes up its band. You possibly can’t change the bands out, so you may be caught with the colour you initially select. That restriction will damage Garmin (and possibly already has), as a result of most different trackers like these from Fitbit permit customers to modify bands out for brand spanking new ones. Not solely does that improve the longevity of the machine, however it additionally lets customers really feel like they’re carrying a customizable accent reasonably than an digital machine.

Along with the usual array of activity-tracking sensors, the Vivosmart four consists of an SpO2 monitor to measure blood oxygen saturation. We’ll get into the main points of this information within the subsequent part, however the Pulse Ox sensor (Garmin’s identify for its SpO2 sensor) is a superb addition to such an reasonably priced machine. Garmin beforehand solely included it in its Fenix collection of smartwatches, all of that are rather more costly than the Vivosmart four. However the Vivosmart four is way simpler to put on all day and all night time than any Fenix watch, making it a great machine to watch respiration and oxygen ranges throughout sleep.

Health: Physique Battery, SpO2, and extra
Physique Battery

The 2 stand-out options of the Vivosmart four are Physique Battery and SpO2 monitoring. The previous quantifies all the things that each drains and powers your physique, providing you with a rating that exhibits how a lot “battery” your physique has all through the day.

Physique Battery takes stress ranges, coronary heart fee variability, and sleep and exercise information under consideration when adjusting your rating—an intense morning exercise might deplete your Physique Battery by 20 or 30 factors, however a restful interval after that would improve it by 15 factors. The rating always adjustments all through the day as you do various things, and on the finish of the day, you’ll be able to see the very best and lowest Physique Battery scores you achieved.

I discovered Physique Battery to be probably the most fascinating for me when it modified attributable to stress. Garmin gadgets acknowledge stress by your coronary heart fee—a pulse that is elevated for lengthy intervals of time (when not exercising) exhibits indicators of stress. These stress intervals can decrease your Physique Battery identical to train can, though you probably will not see a 30-point loss from stress except you have been experiencing a tragedy.

Within the Physique Battery web page in Garmin’s Join cellular app, you’ll be able to toggle between the general Physique Battery graph and stress information. It places stress into perspective as a result of it exhibits precisely when your pulse spiked all through the day. The Vivosmart four thought-about me “careworn” throughout just a few pockets of my day, lots of which have been proper once I awakened and was speeding to prepare for work or the health club. Whereas I’ll not think about myself careworn throughout these occasions, it is illuminating to see simply how typically my pulse spiked all through a traditional day.

Garmin’s loosen up alert goes hand in hand with this, and it is higher than I assumed. At any time when your coronary heart fee spikes above 100 BPM (or the BPM threshold you customise within the cellular app), the Vivoactive four vibrates and exhibits a loosen up alert on its display screen that prompts you to finish a guided respiration train. You do not have to do it (I hardly ever did), however it’s useful to know while you’re getting too labored up about one thing.

These new to day by day exercise will get probably the most out of Physique Battery. It may be tough to evaluate your physique’s state while you’re simply beginning to incorporate day by day train or extra intense exercises. Physique Battery might help these customers see how a lot their exercises affected their our bodies, in addition to how different elements like stress did, that they might not have in mind on their very own. That information might assist new customers make extra knowledgeable choices about coaching days, depth ranges, and relaxation intervals.


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