Just a few days ago, I received the highly anticipated BSX Insight device (Multisport unit). I had originally thought about waiting until after 70.3 NOLA to do a bike test, but after a quick conversation with my coach, Brian Grasky (a USAT level 3 coach), we both decided we were too curious to wait. This device is the world’s first wearable lactate threshold device. What does that mean? No more blood draws/finger pricks. We both knew that I would go into this test being fatigued since I had done a big race simulation on Friday morning, a hard swim set Friday afternoon, and a 6.5 hour training day on Saturday. We figured the results may run a little low, but at least put us in the ball park of what the actual result would be. Based on my high levels of fatigue, we figured the test would read about 10 watts lower. See chart below (a TSB less than -20 indicates high level of fatigue):
To get started, you need to pair your BSX Insight Device with your phone. Simply turn on the bluetooth on your phone and follow the prompts to pair the device. My phone found the BSX device in just a matter of a few seconds.
Secondly, you have a series of questions that it asks that you need to answer to the best of your ability to get the test protocol set up correctly.
Next, for the bike test, the BSX device needs to pair with your power meter and heart rate monitor. My HR monitor synced with my BSX device almost instantly, and the power meter took about 10-15 seconds. Once that is done you get a little tutorial of how the test will be run and you are on your way to the pain cave.
The test starts out extremely easy and ramps up every 3 minutes until failure. My test lasted a little over 33 minutes (not counting my own little warm up and cool down), which is about perfect. I made it about 30 seconds into the 420 watt phase and then cracked. This is a huge improvement for me from when I first demoed the product at the Maverick Multisport Pre-season camp in January where I only got 10-15 seconds into the 400 watt step.
Once I stopped the test, the BSX app went to work and came up with the results:
This is about what I was expecting based on my level of fatigue making the results a bit lower. This is the second time I’ve used the device and both times it was very accurate. The first time, as mentioned above, was at the Maverick Pre-season camp when I was well rested. My coach and I knew going into the test that my FTP was between 345 and 350 watts. The results for that test was 345.
As a reminder, Brian (my coach) and I thought that my level of fatigue would lower the results by about 10 watts. My latest 20 minute critical power test (CP20 test) was 380 watts. By taking 95% of that 20 minute power test, that puts my FTP at 361 watts… putting the BSX on target for this test.
Overall, I like doing the step test better because it takes out the guess work needed in pacing as hard as you can go for the CP20 test. No more starting out too fast and not getting accurate results because of not being able to complete the 20 minute critical power test. It also works well for people who may not push themselves hard enough in a 20 minute critical power test.
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