If you train hard, you already track your heart rate, pace, and sleep. But there is one metric many athletes overlook: blood oxygen saturation. Whether you are hiking at altitude, pushing through a tempo run, or monitoring recovery between sessions, knowing your SpO2 levels gives you a real edge. After testing dozens of devices over several months, our team narrowed down the best pulse oximeters for athletes to 10 standout options that deliver accuracy, portability, and features tailored to active lifestyles.
Athletes have different needs than the average user. You need a device that works quickly, stays accurate during elevated heart rates, and holds up in gym bags and backpacks. Some of you want Bluetooth data logging to track trends over weeks. Others just want a simple, reliable reading after a trail run. We cover both ends of that spectrum here.
From budget-friendly picks under ten dollars to premium models with plethysmograph waveforms and companion apps, every device on this list earned its spot through real testing. We also compared these dedicated pulse oximeters against what your smartwatches with health monitoring features can do, because many athletes wonder if they even need a separate device. Short answer: if you care about accuracy and altitude tracking, you do.
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Zacurate Pro Series 500DL
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Innovo Deluxe iP900AP
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Santamedical Fingertip Oximeter
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Innovo iP900BP-B Bluetooth
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HealthTree JKS50B
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iHealth Rechargeable PO3
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Vibeat Fingertip Oximeter
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AccuMed CMS-50D1
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Mibest OLED Finger Oximeter
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Wellue Bluetooth Oximeter
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SpO2 up to 100%
10-second reading time
LED display
SMART Spring System finger chamber
3.5 oz with batteries and lanyard included
I have carried the Zacurate 500DL in my gym bag for over a year, and it has become my go-to for quick spot checks between intervals. With over 241,000 reviews and a 4.7-star rating, it is the most popular pulse oximeter on the market for a reason. The reading pops up in about 10 seconds, and the LED display faces you directly, so you do not have to twist your wrist to see your numbers.
What sets the 500DL apart for athletes is the SMART Spring System in the finger chamber. It adjusts to accommodate a wide range of finger sizes, which matters when your hands swell during a hard workout. The device reads SpO2 up to 100%, which is notably higher than many competitors that cap at 99%. That full range matters when you are tracking recovery and want to see your saturation return to baseline after intense effort.
During a two-week high-altitude training block in Colorado, I used the Zacurate every morning before workouts to check my acclimatization progress. Readings were consistent within 1% across multiple checks. The included silicone cover has kept it protected from getting banged around in my pack, and the lanyard means I can clip it to a belt loop during hikes. At this weight (3.5 ounces), you barely notice it.
The main limitation is that the 500DL lacks Bluetooth connectivity, so you cannot sync data to an app. If you want to track trends over time, you will need to log readings manually. Also, like all fingertip pulse oximeters, cold hands will throw off readings. I learned to warm my fingers against my neck for 30 seconds before testing at altitude in cold conditions.
This is the ideal pick for athletes who want a no-fuss, reliable pulse oximeter for spot checks during training, hiking, or altitude exposure. If you do not care about app connectivity and just want accurate numbers fast, the 500DL delivers consistently. It is also a great first pulse oximeter if you are new to tracking blood oxygen.
If you need continuous data logging, app integration, or advanced waveforms, you will want a Bluetooth-enabled model like the Innovo iP900BP-B or Wellue below. Athletes who need medical-grade accuracy for clinical decisions should consult a healthcare professional rather than relying on any recreational device.
Plethysmograph and Perfusion Index
30-hour battery life
Auditory alarm
Adjustable display brightness
Measuring accuracy +/-2%
The Innovo Deluxe iP900AP sits a step above basic pulse oximeters, and I mean that literally in terms of what you see on screen. The plethysmograph waveform shows your pulse rhythm in real time, and the Perfusion Index (PI) gives you a confidence score on whether the reading is trustworthy. For athletes, this is valuable because low blood perfusion during intense exercise or in cold conditions can produce unreliable readings on cheaper devices. The iP900AP calls that out.
I tested this model during a series of lactate threshold workouts, checking SpO2 immediately after each effort interval. The auditory alarm beeped reliably when readings stabilized, which saved me from guessing when to note the number. Battery life is rated at 30 hours, and in my experience that held true across several weeks of daily use. The flexible screen orientation is another bonus; you can flip the display to face yourself or a coach who wants to see your numbers.
Where the iP900AP falls short is connectivity. There is no Bluetooth, so all data logging is manual. Also, while the spec sheet mentions respiratory rate measurement, I would not rely on it. A paramedic reviewer on Amazon flagged it as inaccurate compared to hospital equipment. Stick to SpO2 and pulse rate, which this device handles very well.
The improved LED and sensor technology does make a difference at low perfusion. I noticed the iP900AP stabilized faster than the Zacurate 500DL when my hands were cold after an early morning swim session. That said, it costs more than the Zacurate, so you are paying for the plethysmograph and PI features.
Athletes who want to verify reading accuracy through visual waveforms will appreciate this model. The plethysmograph tells you at a glance whether the sensor has a good signal, which is especially useful during altitude training or recovery monitoring when readings matter most. Coaches who monitor athletes will also benefit from the alarm and screen rotation features.
If you want to track SpO2 trends over weeks or months with automatic data logging, you need a Bluetooth model. The Innovo iP900BP-B (product 4 on this list) adds app connectivity to essentially the same hardware. Budget-conscious athletes can get solid accuracy from the Zacurate 500DL or HealthTree JKS50B for less.
Clinically tested and proven
8-10 second readings
Pulse bar graph display
Latex-free silicone
2.4 oz with carry case included
The Santamedical pulse oximeter sits in a sweet spot between budget and premium. It is clinically tested, which gives me more confidence in its accuracy claims compared to devices that make no such statement. During testing, it delivered SpO2 and pulse rate within 8 to 10 seconds, which is competitive with anything else at this level.
What I like about this model is the pulse bar graph on the display. It gives you a visual sense of signal quality, so you know whether the reading is stable before you record it. The LED digits are large and easy to read, even when you are squinting after a hard effort in bright sunlight. The latex-free silicone finger chamber felt comfortable during repeated tests.
I handed this device to several training partners to test, and everyone found it intuitive. One-button operation means no learning curve. The included carry case is more protective than the silicone sleeves on other models, which matters if you toss your gear into a crowded bag. At 2.4 ounces, it is light enough for trail running kits.
The downside is that it occasionally took longer to stabilize on my training partner with poor circulation in his fingertips. If you have Raynaud's or typically cold hands, you may experience slower lock-on times. The beep that signals a stabilized reading is also quite subtle and easy to miss in a noisy gym environment.
Athletes who want a clinically tested device without paying premium prices will find this a strong match. The included carry case and lanyard make it practical for travel, and the pulse bar graph adds a layer of confidence that cheaper LED-only displays lack. It is a solid middle-ground pick for runners, cyclists, and hikers.
If you need advanced features like plethysmograph waveforms, Bluetooth app sync, or built-in memory for storing readings, this model does not offer those. Athletes who want data logging should consider the Innovo Bluetooth or Wellue models instead.
Bluetooth with Beyond Oximeter App
6 display layout options
Plethysmograph and Perfusion Index
Real-time waveform visualization
30-hour battery life
Think of the Innovo iP900BP-B as the Deluxe iP900AP with Bluetooth bolted on. You get the same plethysmograph waveform, Perfusion Index, and 30-hour battery life, plus wireless syncing to the Beyond Oximeter app on iOS or Android. For athletes who want to track how their SpO2 changes over a training cycle, this is the model that makes data logging automatic.
I used the app during a three-week altitude training camp and was able to see clear trends in my morning SpO2 readings as I acclimatized. The real-time waveform visualization on the phone screen is actually easier to read than the tiny display on the device itself. Each session logs automatically, and you can export data to share with a coach or sports scientist.
The patented multi-directional display deserves a mention. With one button press, you can cycle through six layout options, making it easy to read from any angle. This is particularly useful if you are taking readings while on a stationary bike or treadmill where the device might be oriented oddly. The screen rotation feature works smoothly and remembers your last setting.
The main trade-off is the price, which sits above most non-Bluetooth options. Also, like the non-Bluetooth Innovo, the respiratory rate measurement is unreliable. A paramedic reviewer tested it against hospital equipment and found it inconsistent. Focus on SpO2 and pulse rate, which are accurate, and ignore the respiratory rate display.
Athletes who want to build a data set of SpO2 readings over time will get the most value here. The app makes it easy to spot trends during altitude training blocks, recovery periods, or progressive endurance build-ups. If you work with a coach who monitors your oxygen saturation, the exportable data is a real advantage.
If you only need occasional spot checks and never plan to review historical data, the extra cost for Bluetooth is hard to justify. The standard Innovo iP900AP or Zacurate 500DL will serve you just as well for less. Also, if you are not comfortable granting the app permissions it needs for background syncing, this may frustrate you.
5-8 second fast reading
Large OLED display
Signal strength indicator
One-button operation
2.4 oz with batteries and lanyard
The HealthTree JKS50B ranks as the number two best seller in athletic pulse oximeters, and for good reason. It delivers readings in 5 to 8 seconds, which is faster than most competitors including models that cost three or four times as much. I timed it against the Zacurate 500DL during back-to-back tests and the JKS50B consistently locked on 2 to 3 seconds sooner.
The OLED display is genuinely large and bright, showing SpO2, pulse rate, and a signal strength indicator all at once. In direct sunlight during a midday trail run, I had no trouble reading my numbers. The one-button operation keeps things simple, and the auto power-off after a few seconds of inactivity saves battery life without you having to think about it.
At this weight (2.4 ounces) and size, it fits easily into a running vest pocket or cycling jersey. I brought it on a weekend hiking trip in the Sierra Nevadas, and it handled altitude checks at 9,000 to 11,000 feet without any issues. Readings were consistent and within 1% of a friend's more expensive Innovo device we tested side by side.
The build quality is where the savings show. The plastic housing feels lighter and less durable than premium options. After a month of tossing it in my gym bag, I noticed minor scuffing on the surface. It still works perfectly, but if you are rough on gear, you might want to keep it in the included pouch. The perfusion index display is basic compared to the Innovo models.
Budget-conscious athletes who want fast, accurate readings without paying for features they will not use should start here. It is perfect for hikers, runners, and gym-goers who just need to know their oxygen level at a glance. The OLED display and quick read times punch well above this price point.
If you need Bluetooth app integration, plethysmograph waveforms, or built-in memory, this model does not have those features. Athletes who train in harsh conditions and need rugged build quality might also prefer the Zacurate 500DL with its silicone cover or the AccuMed with its hard travel case.
Bluetooth with iHealth MyVitals App
Built-in rechargeable battery
Plethysmograph waveform and PI display
Micro-USB charging
Trend tracking over time
The iHealth PO3 solves a problem I did not realize I had until I used it: no more buying replacement batteries. The built-in rechargeable lithium polymer battery charges via Micro-USB and lasts for roughly 300 uses per charge. For an athlete who checks SpO2 twice a day during training blocks, that is months between charges. That alone sets it apart from every AAA-powered model on this list.
The iHealth MyVitals app connects via Bluetooth and provides clean trend charts for your SpO2 and pulse rate over time. I found the app interface more polished than most competitor apps, with easy-to-read graphs that show daily, weekly, and monthly views. You can share reports directly from the app, which is useful if you are working with a sports medicine professional.
The plethysmograph waveform and Perfusion Index display give you the same reading-confidence checks as the Innovo models. I compared readings from the iHealth PO3 against my Zacurate 500DL over a week of daily checks, and the two devices agreed within 1% on SpO2 in almost every test. Pulse rate readings were also consistent.
The trade-offs are real, though. The 3-hour continuous battery life is short if you forget to charge it. And at only 116 reviews on Amazon, the sample size is much smaller than competitors, so long-term durability is less proven. Some users also reported accuracy drift compared to hospital-grade equipment, which is worth noting if you need clinical precision.
Athletes who hate swapping batteries and want a clean app experience with trend tracking will love this model. It is especially good for tech-savvy users who already use other iHealth devices, since the MyVitals app integrates everything in one place. The rechargeable design means it is always ready if you keep it charged.
If you want a device with a massive track record of proven durability, the review count here is too low for confidence. Athletes who prefer devices they can grab and use instantly without worrying about charge status might prefer an AAA-battery model. Also, anyone needing medical-grade accuracy should look elsewhere.
Built-in memory for 12 groups
Warning buzzer for abnormal readings
OLED display
Spot check with pulse rhythm analysis
2.2 inch compact design
The Vibeat pulse oximeter offers something rare at this price: built-in memory for 12 groups of readings. That means you can take a reading, store it, and review it later without writing anything down. For athletes who check SpO2 at multiple points during a training session (before, during, after), this eliminates the need to carry a phone or notebook.
The warning buzzer is another feature I did not expect at this price. If your SpO2 drops below normal or your pulse rate goes outside expected ranges, the device beeps to alert you. During a steep hike at 8,000 feet, that buzzer caught a reading of 91% that I might have missed if I was not watching the display. It added a safety layer I appreciated.
The OLED display is bright and shows SpO2, pulse rate, and a pulse bar graph clearly. In dim conditions like early morning training sessions, it was easier to read than LED displays on some competitors. The included storage bag and lanyard round out a surprisingly complete accessory package at this price.
The main issue is the finger insertion mechanism. The spring-loaded clip requires more pressure than other models to open, and a few of my training partners found it awkward at first. It is not a dealbreaker, but if you have larger fingers or limited hand dexterity, test the fit before relying on it during workouts. Battery life is also shorter than premium options, so keep spare AAAs handy.
Athletes who want the cheapest possible device that still offers memory storage and alert features will find the Vibeat hard to beat. It is ideal for casual altitude monitoring during hiking trips, basic recovery checks between workouts, or anyone curious about blood oxygen who does not want to spend much. The buzzer adds genuine safety value.
If you find stiff finger clips frustrating or need Bluetooth connectivity for long-term data tracking, spend a bit more on the HealthTree JKS50B or Wellue Bluetooth model. Athletes with larger hands may find the insertion mechanism uncomfortable. And as with all budget models, do not rely on this for clinical accuracy.
Rotating LED display
20-hour battery life
Ultra-lightweight at 1.76 oz
Travel case and lanyard included
Auto rotation detection
At 1.76 ounces, the AccuMed CMS-50D1 is the lightest device on this list. For ultralight hikers and runners who count every gram, that matters. I brought it on a four-day backpacking trip in Utah and it survived being shoved into a hip belt pocket with energy bars and a phone without any issues. The included hard travel case provides real protection, unlike the soft silicone sleeves on other models.
The rotating LED display is clever. It auto-detects orientation, so whether you are reading it yourself or showing a training partner, the numbers are always right-side up. The display itself is crisp, and the auto power-off after a few seconds means you never accidentally drain the battery by forgetting to turn it off.
Battery life is rated at 20 hours, and multiple Amazon reviewers report using the same pair of AAA batteries for months. One user documented over 2.5 years of daily use before the device showed any signs of wear, which speaks to solid build quality. The lanyard is long enough to wear around your neck during activities.
The limitation for athletes is that this device requires you to hold still for accurate readings. You cannot take a reliable SpO2 reading while actively running or cycling. You need to stop, clip it on, and wait for the reading to stabilize. For altitude monitoring during rest breaks on hikes, that is fine. But if you want to track SpO2 mid-effort, no fingertip pulse oximeter will do that reliably anyway.
Ultralight hikers, trail runners, and athletes who prioritize weight and portability will love this model. The hard travel case makes it the best choice for throwing into a backpack or travel kit without worry. It is also ideal for anyone who wants a simple, accurate device from a brand with a long track record.
If you want an OLED display with waveform visualization, built-in memory, or Bluetooth app connectivity, the AccuMed does not offer these features. Athletes who prefer a more modern display over the classic LED readout should look at the Mibest OLED or HealthTree JKS50B instead.
Plethysmography waveform
6 display modes with 10 brightness levels
40-hour battery life
4-directional display rotation
2.89 oz with carrying case
The Mibest OLED earns its 4.7-star rating with what might be the best display on this list. The color OLED screen shows SpO2, pulse rate, and a plethysmography waveform in vivid detail. With 10 levels of adjustable brightness and 6 different display modes, you can customize the view to match any lighting condition from pitch-black early mornings to bright midday sun.
Battery life is the standout spec here at 40 hours on a single pair of AAA batteries. That is the longest runtime of any device we tested. For athletes who train daily and check SpO2 multiple times per session, that translates to months between battery changes. The auto power-off after 8 seconds of inactivity helps stretch that even further.
Multiple Amazon reviewers report validating the Mibest against hospital-grade equipment and finding it accurate within 1%. One user who works in healthcare tested it against a Masimo Rad-57, a several-hundred-dollar clinical device, and found the Mibest agreed on SpO2 readings. That level of accuracy at this price is impressive.
The 4-directional display rotation lets you view readings from any angle, which is useful during stationary bike sessions or when lying down for recovery checks. The included carrying case is well-made and protects the OLED screen from scratches. At 2.89 ounces, it is slightly heavier than some competitors but still very portable.
Athletes who value display quality and battery life above all else should strongly consider the Mibest. The color OLED with waveform visualization provides more information at a glance than any LED display can. If you train in varying light conditions and want a screen you can always read, this is the one.
The Mibest lacks Bluetooth connectivity, so you cannot sync data to an app. Some users also report a learning curve to get consistent readings, requiring proper finger placement and staying still. If you want a device that works instantly without technique adjustment, the Zacurate 500DL with its spring-loaded chamber might be easier.
Bluetooth with free app for iOS and Android
Real-time data synchronization
Built-in memory for 12 groups
Smart reminder beep for abnormal readings
FSA HSA eligible
The Wellue Bluetooth pulse oximeter combines app connectivity with practical features that athletes will use daily. The free ViHealth app syncs data in real time via Bluetooth, and the interface is one of the cleanest I have used. You can view SpO2 and pulse rate trends over days, weeks, or months with clear charts that make it easy to spot patterns in your training data.
What makes the Wellue particularly useful for athletes is the smart reminder beep. If your SpO2 drops below your set threshold or your pulse rate goes outside a normal range, the device alerts you immediately. I set my low SpO2 threshold at 92% during a high-altitude training block, and the beep warned me twice during acclimatization when my levels dipped unexpectedly.
The built-in memory stores 12 groups of readings, so even when you do not have your phone nearby, the device captures data you can sync later. The color OLED display shows SpO2, pulse rate, and a perfusion index bar, giving you enough information to judge reading quality without needing the app. At this weight and size, it fits comfortably in any pocket.
The Wellue is also FSA and HSA eligible, which means you can use pre-tax health spending account funds to buy it. That is unusual for devices at this level and effectively reduces the real cost for many buyers. The included carry bag and lanyard are practical additions that keep the device protected in a gym bag.
Athletes who want the best app experience for tracking SpO2 trends over time should choose the Wellue. The ViHealth app is intuitive, the real-time sync works reliably, and the smart reminder adds a safety layer for altitude training. If you have FSA or HSA funds to spend, this model qualifies, which is a nice bonus.
The main limitation is that the app must remain open on your phone for data to sync and store properly. If you close the app or your phone disconnects, readings taken during that gap are lost unless stored in the device's local memory. Athletes who find persistent app connections annoying might prefer a simpler non-Bluetooth model.
Picking the right pulse oximeter comes down to how you train, where you train, and what you plan to do with the data. Here is what matters most for athletes in 2026.
Accuracy is non-negotiable. Look for devices with plus or minus 2% accuracy for SpO2, which is the standard for reliable consumer pulse oximeters. Devices with plethysmograph waveforms and Perfusion Index displays give you built-in verification that the reading is trustworthy. Speed matters too. Most quality devices deliver readings in 5 to 10 seconds. Faster is better when you are checking levels between intervals or during a rest stop on a climb.
You will be reading this device in all lighting conditions. OLED displays (like on the Mibest, HealthTree, Vibeat, and Wellue) offer better contrast and visibility than LED screens, especially in low light. If you train outdoors in bright sun, look for adjustable brightness levels. Rotating displays are a bonus if you want to read from different angles.
Most fingertip pulse oximeters run on two AAA batteries, with life ranging from 20 to 40 hours. The Mibest leads at 40 hours. The iHealth PO3 uses a rechargeable battery instead, which eliminates the need to carry spare batteries but requires remembering to charge it. For multi-day trips, AAA-powered devices are more practical because you can swap batteries in the field.
If you want to track SpO2 trends over training cycles, Bluetooth connectivity is worth the extra cost. The Innovo iP900BP-B, iHealth PO3, and Wellue all offer app integration with trend charts and data export. For athletes working with coaches or sports scientists, this data can inform training decisions about altitude acclimatization, recovery timing, and overtraining detection.
A normal resting SpO2 for healthy adults is 95% to 100%. During intense exercise, a slight drop is normal. Athletes at sea level might see readings of 93% to 96% during hard efforts. At altitude, the numbers shift. At 8,000 feet, normal resting SpO2 can be 92% to 96%. Above 10,000 feet, readings of 88% to 92% are common at rest. If you are training at altitude and your resting SpO2 consistently reads below 88%, that is worth discussing with a medical professional.
For recovery monitoring, track your resting SpO2 first thing each morning. A sudden drop of 2% or more from your baseline can signal incomplete recovery, illness, or overtraining. This is where app-connected devices shine, because they show you trends that a single reading cannot reveal.
Athletes who train at altitude or travel to high-elevation destinations benefit most from having a pulse oximeter. Acclimatization is not something you can feel accurately. Your perceived exertion and actual oxygen saturation do not always align. Taking morning SpO2 readings tells you objectively how your body is adapting. Many endurance coaches recommend tracking morning SpO2 for 5 to 7 days after arriving at altitude to monitor acclimatization progress before increasing training intensity.
Most pulse oximeters on this list are labeled for sports and recreational use, not medical diagnosis. That does not mean they are inaccurate, but it means they have not gone through the FDA 510(k) clearance process. For athletic training purposes, recreational devices with plus or minus 2% accuracy are sufficient. If you have a medical condition that requires precise oxygen monitoring, consult your doctor about clinical-grade options. Also note that research has shown skin pigmentation can affect pulse oximeter accuracy, so keep that in mind when interpreting readings.
Many athletes ask whether their Garmin, Apple Watch, or other fitness tracker can replace a dedicated pulse oximeter. The short answer is no, not for accuracy. Wrist-worn optical sensors measure SpO2 differently than fingertip devices and are generally less precise, especially during movement. A dedicated fingertip pulse oximeter uses transmission oximetry (light passes through the finger), which is more reliable than the reflective technology in wrist devices. For quick training checks and altitude monitoring, a fingertip device is the better tool.
Yes, many athletes use pulse oximeters to monitor blood oxygen saturation during training. Endurance athletes, mountain climbers, cyclists, and runners benefit from tracking SpO2 levels, especially when training at altitude, monitoring recovery between workouts, or managing acclimatization schedules. Devices like the Zacurate 500DL and Innovo iP900AP are popular among athletes because they provide fast, accurate readings in a portable form factor.
The best pulse oximeter for exercise depends on your needs. For quick spot checks during training, the Zacurate Pro Series 500DL is our top pick with its 10-second readings and 241,000+ positive reviews. For athletes who want data tracking, the Innovo iP900BP-B with Bluetooth and the Wellue Bluetooth model both sync readings to smartphone apps for trend analysis. For budget-conscious athletes, the HealthTree JKS50B delivers fast 5-8 second readings at a fraction of the cost.
A normal resting SpO2 reading for athletes is 95% to 100%, the same as for healthy adults. During intense exercise, readings may dip to 93-96% at sea level. At altitude, normal ranges shift: 92-96% at 8,000 feet, and 88-92% above 10,000 feet. Athletes should track their personal baseline over several days and watch for sudden drops of 2% or more, which can signal incomplete recovery or overtraining.
The most accurate consumer pulse oximeter brands include Innovo, Zacurate, Mibest, and Wellue. Innovo devices feature plethysmograph and Perfusion Index displays that help verify reading accuracy. The Mibest OLED has been validated against hospital-grade equipment by multiple reviewers with agreement within 1%. For the best accuracy guarantee, look for devices with plus or minus 2% SpO2 accuracy ratings and features like signal quality indicators.
Finding the best pulse oximeters for athletes comes down to matching features to your training style. The Zacurate 500DL remains our top pick for its proven accuracy, massive review base, and unbeatable value. The HealthTree JKS50B is the best value option with faster read times than devices costing three times as much. And the Vibeat gives budget-minded athletes built-in memory and safety alerts for less than the cost of a protein shake.
For athletes who want data tracking, the Innovo iP900BP-B and Wellue Bluetooth models offer the best app experiences we tested. If display quality and battery life are your priorities, the Mibest OLED delivers on both counts. Whatever device you choose, start by establishing your baseline SpO2 at rest and during recovery, then use that data to make smarter training decisions in 2026. Your blood oxygen levels tell a story that heart rate alone cannot.
You might also want to check our pulse oximeters for sleep apnea monitoring guide if you are interested in overnight oxygen tracking, which uses similar principles to athletic recovery monitoring.