Masimo Mighty Sat Finger Tip Pulse Oximeter
Kris Keefer

For anyone that has been hurt on a dirt bike has had this little clip (Pulse Oximeter) on their finger to measure certain parameters that are needed by doctors. Well those numbers are not only important when you're laid up in a hospital bed, but also is very important when it comes to training correctly. The Masimo Mighty Sat Fingertip Pulse Oximeter by Masimo Corporation is a Bluetooth enabled pulse Oximeter which uses hospital grade technology to measure Oxygen Saturation, Pulse Rate, Perfusion Index, Respiration Rate, and Pleth Variability Index. It is measured by placing the pulse Oximeter on your fingertip (left ring finger) and within seconds the information is on the screen. It can be used with a companion iOS or Android app, or standalone.

You can pair your smartphone or tablet via Bluetooth so you can track trend over time, or you can simply use the Pulse Ox standalone. There is no setup other than downloading the app to your device. It also supports multiple profiles and can be used on those that weigh over 65 pounds. 

Measurements on the Mighty Sat:

Oxygen Saturation (SpO2) – the oxygen level in the arterial blood to indicate changes due to heart or lung function, oxygen use by your body, or altitude.

Pulse Rate (PR) – the number of pulses per minute to indicate overall fitness as well as exertion levels at a particular moment in time.

Perfusion Index (PI) – the strength of blood flow to your finger to indicate changes in blood circulation.

Respiration Rate (RRp) – the number of breaths you are taking each minute to indicate how well your heart and lungs are functioning as well as how quickly you can recover after exercise.

Pleth Variability Index (PVI) – the variation in perfusion index over your breathing cycle. Changes in PVI may indicate changes in hydration, breathing effort, perfusion, or other factors.



I woke up every morning to track my numbers over the course of just over a month. By tracking my oxygenation and pulse rate along with numerous other biophysical and behavioral metrics, I used this data to measure and improve my athletic performance and gauge my recovery. With the rigors of testing and trying to cram my own personal training in for Loretta Lynn’s, I am lighting the candle on both ends on most days.

With the Masimo Mighty Sat it took a lot of the guesswork out of trying to figure out if I was really tired or just being lazy on any given day. If my oxygen saturation was near 98-99% along with a low resting heart rate I knew I could train on that day. If my oxygen saturation was below 95% with a higher resting heart rate, I knew I should try to get my testing done and not add to my day with any extra circular physical activities. I really tried to pay attention to the numbers when I read the Sp02 readings were high and if I could really push it on those training days. I was surprised to find out that I did feel fresh on those days and I could push more. I guess science can help, who would of thought!

On the days my Sp02 numbers were low an PR was high I didn't feel like I was super tired, but I could tell that I was just a little flatter on those days. Don’t expect to see your numbers vary right away when you start out as it took me a solid 8-10 days to see variances in my readings. The Masimo Mighty Sat is super easy to use and was really informative to track (record) all of my numbers when training with the Masimo Professional Health app on my iPhone.

I am going to continue to use this sucker, especially since I have some scientific facts behind my claims that I can’t train and must rest. That way when I tell my good friend and trainer Seiji Ishii I should stay home and chill, he will not call me out and tell me I am a wussy boy. 

The Masimo Mighty Sat will run you $299.99 and is available at