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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]].) '''BSX has abandoned sales of this sensor, and will decommission the cloud services in Feb 2019. However, they have released the code to their [[Connect IQ]] data field to the 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.