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BSX is a simple, easy to use [[Running Sensors| Running Sensor]] that estimates your [[Lactate Threshold]], but I don't believe its results are correct or useful. You just wear the BSX monitor in a custom calf compression sleeve that it comes with, along with the BSX app on your phone, while running on a treadmill. The BSX app tells you what pace to run at, which increases every 3 minutes until you can't continue, at which point it (probably) tells you (it's guess at) your [[Lactate Threshold]] pace. Sadly, while the BSX simple and easy to use, the results are rather dubious and it's unclear to me if it does a better job than simply using an estimate of your 10K race pace. (This review is for the second generation BSX; for results of the first generation, see [[BSX Gen1]].) '''It seems that BSX has abandoned sales of this sensor, and is going to will decommission the cloud services it requires in Feb 2019. However, they have released the code to their [[Connect IQ]] data field to be usefulthe open source community. '''More at http://blog.bsxtechnologies.com/2018/02/09/bsxinsight/

* '''Usefulness'''. I have two concerns around the usefulness of BSX. The first issue is that [[Tempo Runs]] don't appear to be an effective form of training, so the value of knowing your Lactate Threshold seems rather limited. However, the BSX could still be of value if it's a viable measure of training intensity, especially for [[High Intensity Interval Training]]. Typically, [[Heart Rate Drift| Heart Rate Training suffers from drift]], so something more reliable might be useful. However, in my testing I found that the BSX did not seem to meaningfully reflect my training intensity. During either the BSX incremental treadmill tests or during [[High Intensity Interval Training]] the BSX showed a relatively stable muscle oxygenation[[Muscle Oxygen Saturation]]. This is in contrast with the [[Moxy]] system that showed a better relationship between intensity and muscle oxygenation[[Muscle Oxygen Saturation]]. The only noticeable change in muscle oxygenation that I saw with BSX was during the initial transition from walking to running.