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The first ever all-in-one wearable sensor that pairs with your sports watch. Includes lactate threshold technology, HR, cadence & more Read more

Houston, TX Wearables
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This project was successfully funded on April 11, 2014.

The first ever all-in-one wearable sensor that pairs with your sports watch. Includes lactate threshold technology, HR, cadence & more

Houston, TX Wearables
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About this project

BSX Insight is the most powerful athletic monitor, period. Its technology combines the activity measurements of four separate devices into one sleek, comfortable design. With BSX Insight you can simultaneously record heart rate, cadence, pace, calories burned, and for the first time ever, your Lactate Threshold! Have you ever wondered what your athletic horsepower is, and how it stacks up against the competition? Well, you're about to find out!

Insight represents the next generation of wearable tech by going beyond just passively tracking activity to actively transforming it. It is also the first and only wearable smart sensor on the market to sync at the same time with both ANT+ and Bluetooth 4.0—which means more flexibility when you’re on the go and want to check your stats on your watch. 

Insight “looks inside” your muscle during exercise to measure real bio signals and determine how hard you’re actually working, compared with how hard you should be working. Through paired communication with your sports watch it lets you know, in real-time, whether to speed up, slow down, or even rest.  BSX Insight is best used both during training as well as on race day to help you finish your perfect race. With BSX Insight you are sure to get the most out of every mile, every time.

Whether you train to complete or train to compete, chances are you do it because it tells you something about yourself. Or because of the way it makes you feel as you watch the sweat pooling at your feet knowing that you’re a little better than you were the day before.

Sure, a side effect might be that you look better naked or that you have something else to brag about on Facebook, but most likely, it’s about much more than that.

Sports are about self actualization and discovery. And if you're like the rest of us, training with tech is not about the numbers but the self awareness. It helps you recognize how your body is responding to training and make the real-time adaptations that will help you become your very best. 

This is why we created BSX, to help athletes redefine what is possible and continually set new personal records.

Industry experts report that training with lactate threshold can increase performance up to 5% to 25% in elite and aspiring athletes. Envision shaving a full 40 minutes off your marathon PR.  How great would that feel?

With BSX Insight you completely take the guesswork out of training, enabling you to train smarter. It does this by simultaneously measuring your HR, pace, cadence, fuel reserves and most importantly your lactate threshold (or athlete horsepower). These create a composite of your current fitness profile and tell you precisely what changes to make so you can focus on what your body needs.

Everyone will probably use Insight a little bit differently, but we recommend both athletes and coaches use Insight to:

Runner's Edition: Designed specifically for runners.  Capable of measuring and maintaining lactate threshold profiles for a single user.

Multi Sport Edition: Includes both CYCLING and RUNNING profiles.  Enhanced capabilities allow a user to measure and simultaneously maintain multiple lactate thresholds for each of their sports, plus other advanced metrics like bike cadence.

Team Edition: Designed for multiple users. Capable of holding up to 10 profiles simultaneously on a single device. Perfect for coaches who understand the value of data. 
Keeping it simple:
  • The sensor is comfortably placed on the leg using a stylish, custom designed compression sleeve.
  • LEDs shine an invisible light inside your calf muscle during exercise.
  • The signal of light is altered as it returns back to the sensor.
  • Real time analysis of all 5 bio signals are used to precisely determine how hard your body is actually working.
  • Information is immediately sent back to your paired sports watch telling you how to adjust intensity.
  • Training recommendations are simple and actionable (e.g. “slow down!”) so you can focus only on the workout while the tech does the rest. 
  • After your workout, BSX Insight automatically syncs with our free web-based software (trainBSX) so that you can review all your data. (Other third party platforms being added soon thanks to your support!)

Keeping it not so simple (for us nerds):

The primary sensor is comprised of an LED array that passes light through the muscle belly of the gastrocnemius (also known as the calf muscle), and a detector. As the light passes through the muscle tissue, it is reshaped by elements within the tissue (known as chromatophors) to produce a unique signal (similar to a fingerprint) that contains information about the local metabolic activity. 

This profile is then processed by embedded BSX algorithms to analyze identifiable signal features which exist within the profile. When combined together, these are used to accurately generate a lactate threshold curve. Real-time monitoring of this curve allows the athlete to always know where they are along that curve and their proximity to crucial training thresholds.

In each of the examples above, the biosignal is determined by measuring changes in the optical characteristic of the calf muscle which differs in large part due to the muscle contractions and blood pulsing through the tissue.

Note: The BSX Insight that you see in the videos and pictures is a real, working prototype.  We are still working on the final look and feel!  We'll keep you updated along the way as we add new features, make it smaller and lighter, and finalize its sleek, powerful design. 

Mechanically speaking, horsepower is the best way to understand and compare a vehicle’s potential performance. Generally, the higher the number, the faster it will go and better it will perform in a race. Similarly in human performance, LT (or athletic HP) perfectly measures how the athlete’s body is performing so that real-time adjustments can be made.

Lactate Threshold is one of the most common, and THE most effective, performance marker used by competitive coaches and athletes. For over 50 years it has been the gold standard for performance measurement and has repetitively been shown to be over 95% accurate at predicting race finish order*.  This means it can be used with near perfect accuracy to personalize the appropriate training intensities of each athlete.

*Predicting competition performance in long-distance running by means of a treadmill test. Med. Sci. Sports Exerc., Vol. 30, No. 10, pp. 1552-1557, 1998.

Lactic acid is similar to the exhaust emissions produced from the muscular contractions of exercise. In a car, stepping on the gas harder produces more fumes. Similarly, in exercise, greater training intensities produce more lactic acid. When measured accurately lactic acid levels can precisely measure how hard the body’s engine is working.

Even though lactic acid is not entirely harmful (the subject of an entirely separate discussion!), too much of a good thing is always bad for you. When lactic acid starts to build up in the body it does so very dramatically and very quickly. This event is known as lactate threshold and it signals a state of imbalance—when the body is starting to depend on less efficient energy sources. Exercise intensities at this level can only be maintained for a short period of time before fatigue and exhaustion occurs.

Since fatigue and exhaustion are never the goal of an endurance athlete, lactate threshold is an important event to both know and train for. Training by lactate threshold is a primary method used both at the Olympic Training Center and by other elite athletes.

 And now, BSX Insight makes lactate threshold easily accessible to you as well!

 Kickstarter is an all-or-nothing shot at bringing something people believe in to life.

We believe that just because “that’s how it’s always been done” doesn’t mean that’s necessarily the best way to do something. Neither did Thomas Edison. That’s why we didn’t pursue residency after medical school. That’s why we left successful jobs in other fields. That’s why we’ve been in our office for nearly a year and managed to kill all of our plants and hang none of our pictures.

We genuinely believe that BSX Insight has the ability to transform endurance training forever. 

If you’re the kind of person who likes being at the forefront of change and believes in challenging the status quo, in finding a better way, and in improving yourself, then we’d love to have you accompany us on this journey.

By contributing and thereby supporting our dream, and helping to bring BSX Insight to market, we hope to support your dream of shattering personal records and becoming a better version of yourself.

Your contributions will be used to:
  • Take our prototypes through one final board spin as we prepare for volume manufacturing
  • Complete the software that will enable BSX Insight to communicate with your sports watch or other wearable device. (It currently only connects with Garmin devices and we want it to connect with others like Polar, Suunto, Timex, and more).
  • Integrate with social and training platforms like Training Peaks, Strava, Daily Mile, Athlinks, Facebook, Twitter, etc.
  •  Finalize the sleek, low profile, fully miniaturized design.
We tested the following athletes as part of the validation process for BSX Insight:

We’ve been hard at work for four years preparing for this moment. What started as a simple question has now turned into an elegant technological solution for one of the most prevalent problems in any endurance sport—how do I unleash my full potential? To spare you the burdensome details of all that has transpired while solving this problem, we will highlight the most important milestones that have occurred:

Our intellectual property portfolio consists of two utility patents with others on the way (i.e. you're getting a truly unique product).

  • Jan 2014: Final round of subject recruitment for usability testing and data collection and preparation of data for analysis
  • Feb 2014: Data analysis and final round of algorithm training
  • March 2014: Finalization of EE optical and software design in preparation for volume manufacturing
  • July 2014: PCB/enclosure miniaturization, power optimization and battery customization
  • August 2014: Lock down final design and quality control testing
  • Sept 2014: Begin contract manufacturing
  • Q4 2014: Get BSX Insight in your hands!
  • Current Dimensions: 110mm x 55mm x 12mm (estimated finished dimensions will be 40% smaller)
  • Current Weight: 50 grams (estimated final weight will be 30g)
  • ARM microcontroller
  • ANT+ compatible 
  • Bluetooth 4.0 compatible  
  • Accelerometer, 3-axis Gyroscope 
  • Rear LED color display for accuracy visualization 
  • Front facing multi-wavelength LED array for bio sensing
  • Built-in rechargeable 800 mAh lithium polymer battery (run time: 12 hours, standby: Up to 3 weeks)
  • IP67 water-resistant (currently undergoing testing) 

You may have noticed that we've included free months of trainBSX premium as part of the rewards you receive for contributing to our campaign. trainBSX is our web-based training software for the modern coached athlete. While we're fully intent on forging partnerships to ensure that you can eventually use BSX Insight with the training software of your choice, we're confident that combining BSX Insight with trainBSX's simple plan creation and intuitive performance analysis will take your training to the next level.

You DO NOT have to be a premium member or coached athlete to analyze the data received from BSX Insight. Our free version of trainBSX will provide analysis of your lactate threshold, heart rate, cadence, pace and calories burned.

Risks and challenges

We know we can't make a high quality finished product without strong and well informed partnerships. We have already built that foundation (including optical consultants, electrical and software engineering, and industrial design) and are identifying several other key partners including the Sourcing and Manufacturing team.

We've applied and plan to incubate with top companies in the supply chain and logistics industry. Together, with strategic partnerships, we will deliver a high quality finished product on time and defect free.

Will there be issues and concerns along the way? Yes is the only real answer. Our supporters will continuously be informed on the progress we're making towards delivering their order. If an unforseen issue poses a potential delay to our timing, then we will be transparent and timely in our communication to the people who are making our growth a reality.

The people who support BSX Insight on Kickstarter are our most important asset. Thank you for believing in us. We will do whatever it takes to
exceed your expectations. Thanks!

- Dustin Freckleton, President and Co-Founder

Learn about accountability on Kickstarter


  • BSX Insight is equipped with both ANT+ and BLE communication stacks. This allows it to communicate with any ANT or low energy Bluetooth enabled device, including sports watches and eventually even phones (for example new Samsung Galaxy and Note phones have built in ANT antennas).

    Most watches on the market today use ANT+ (it has become the defacto standard for wireless transmission of sports data) including Garmin, Timex, Suunto, etc. I'd recommend checking with your watch manufacturer to confirm they use ANT and if they do, it will pair just like other peripheral devices you’re currently using (e.g. HRM).
    Watch integration is our first priority and right now we are working with Garmin to fully integrate BSX Insight into both their watches as well as their software platform. As we grow, we will branch out to include other watch platforms too. This tight integration will provide a more seamless and automatic experience, allowing athletes to both download data from their watch after a workout, as well as push new workouts to the watch which include personalized training zones.

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  • Insight will connect via ANT+ with your watch just like a HR meter, power meter, pedometer, or other peripheral device. At the moment BSX Insight is a wearable lactate threshold sensor and our algorithms are built to identify target zones and then facilitate an athlete’s adherence to that zone. I.e. telling them when they need to speed up or slow down to obtain the best training outcome. We did this for two reasons: 1) the ANT+ communication standard does not contain LT profiles allowing us to prompt with exact LT information in real time. This is something we are working on with currently and hope to have added soon. 2) speed up/slow down is much simpler and more actionable than mmol concentrations! As we face a sizeable need to educate the endurance community on lactate dynamics this is a good first step. Long story short... in either a future feature update or second generation (if hardware requires it) we hope to include real-time mmol values as well.

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  • NO!

    You DO NOT have to be a premium user (coached or uncoached) on trainBSX to analyze the data received from BSX Insight. In fact, you don’t have to use trainBSX at all. Our goal is to develop a truly agnostic piece of wearable tech that in time will sync with any other training platform—Training Peaks, Addaero, etc. Of course this will depend on the cooperation of the developers of those platforms. We are working on developing the relationships with those parties to make that possible very soon. At the same time, we wanted a platform that would seamlessly integrate with Insight from the very beginning.

    If you think of BSX Insight as a wearable peripheral (similar to power meter, heart rate meter, pedometer, etc) this makes sense. Each of these devices transmit their data wirelessly (e.g. ANT+, BLE, etc) to a sports watch that packages the information into a workout and transmits that (e.g. TCX file) to a piece of software for storage and post workout analysis. We are eagerly working with and the developers of third party platforms to ensure lactate data can be both transmitted and stored no matter what watch or software you choose to use.

    We naturally believe that trainBSX will be a pedestal product in this space. If you don’t want to use it, you can still get full value out of BSX Insight. If you do choose to use trainBSX for your training you don’t have to be a premium user. You will still have full ability to measure, record, and trend both your LT and other endurance metrics over time. If you choose to become a premium user ($3.99/mo) it costs less than fifty dollars per year. Additionally, the premium version will enable you to create your own workouts and push planned workouts to your watch. This will essentially allow you to take your coach with you whenever/wherever you train. The watch will tell you when to speed up/slow down based on your LT training zones and the schedule of your coach.

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  • Each device (Runner and Multisport) is only capable of maintaining training data and profiles on a single athlete. Sharing between multiple athletes will obscure results and result in inappropriate training zone calculations. For those of you looking for this shared functionality though, you’re not alone and we would recommend the Team Edition. It is perfect for this scenario. The Team Edition is capable of maintaining up to 10 lactate threshold profiles at once. You can learn more about the different models of BSX Insight in our other FAQs or the campaign page.

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  • BSX Insight comes in 3 versions: Runners Edition, Multisport Edition, and Team Edition.

    The *Runner’s Edition* is capable of measuring and maintaining a running lactate profile (including both lactate threshold and variable training zones) for a single user, along with traditional endurance metrics like heart rate, cadence, pace, and calories-all in a single device.

    Initially we had only a single device type, but found that lactate profiles were significantly different between different sports in the same athlete. This made it impossible to have a single LT curve accurately depict optimal training paces for both running and cycling. In response, we have had to change some of the components and algorithms to be able to identify and maintain two separate lactate profiles. This is the reason for the two separate SKUs.

    The *Multisport Edition* was developed at the behest of our cyclist and multisport friends who train on a bike and, whether in event preparation or cross training, also run. This edition allows a user to measure and simultaneously maintain multiple lactate profiles (including both lactate threshold and variable training zones) for each of their sports in addition to the other traditional endurance metrics found in the Runner’s Edition. For now, it will also include bike cadence. Depending on the level of support from the Kickstarter Community we also hope to include left/right balance at product launch or soon thereafter.

    We’re excited to be including this edition in our initial market release to Kickstarter supporters this Fall! If it weren’t for the support of our local endurance community it would not have been possible to tackle both for joint release so soon.

    The *Team Edition* was designed at the request of our MUCH APPRECIATED partner coaches who want to be able to use Insight for multiple users at once. It is capable of holding up to ten lactate profiles (including both lactate threshold and variable training zones) simultaneously on a single device. It is perfect for coaches and teams who understand the value of data or users who want to share Insight for only periodic lactate threshold measurements.

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  • The compression sleeve is primarily the apparatus used to hold BSX Insight in place so that it can get the most accurate LT reading during your assessment run and subsequent training and racing activity.

    We’re well aware that some people don’t love compression sleeves for any number of reasons and we’re working with our fabric partners on multiple solutions, including smaller, less invasive sleeves.

    Many athletes have asked, “How should I wear the sleeve? Does it matter if I switch legs or always keep it on the same?”

    We'd recommend either of the following: 1) wearing all the time on one leg really doesn't matter, you won't notice a difference, 2) rotate legs if you'd like to, or 3) in response to the many questions we've also developed a matching pair of sleeves so you always get the support of both legs and can rotate the device if you'd like.

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  • Your initial lactate threshold and zone targets are set by the LT assessment run. Real-time target adherence is then monitored by continuous wearing of Insight and your watch. If you wanted, you could then use those zones and/or pace and plug them into your current training systems.

    Here's two different use cases:
    1. Daily training (Recommended): BSX Insight untangles you from the multitude of one-off wearable devices out there (including constrictive heart rate monitors) and measures all the endurance metrics you care about. We recommend wearing it continuously as part of your training regimen.
    2. Monthly LT training zone updates: Alternatively you can use the device once to determine your lactate threshold and LT training paces and then plug the zones/pace into your smart watch or power meter to monitor adherence. In this instance, you'd still want to periodically (every 4-6 weeks) use BSX Insight to determine how your fitness has improved based on your improved training -- and to alter your zones/systems accordingly.

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  • BSX Insight is the product of many years of research to develop a noninvasive technique for measuring lactate threshold. Our work actually started in the medical space as we worked with local university and hospital research centers to develop translational technologies. Our efforts build on over a decade of scientific effort that has demonstrated the viability of using optical techniques (specifically near-infrared spectroscopy- aka NIRS) to noninvasively monitor athletic performance. NIRS uses light to measure and record activity inside living tissue in a safe manner. A light source shines a signal into the target which then passes through as it returns back to a detector. Depending on the physical and chemical properties of that tissue, the signal is distorted along its path. These distortions (also known as absorption spectra) are what contain the information we are able to process afterwards. For example, oxygenated and deoxygenated hemoglobin have very predictable and very distinct absorption spectra from each other (you mentioned Moxy and Portamonn which do just this). This allows us to measure their relative and absolute ratios as well as the total amount of blood flow through the target region. BSX has perfected both the front end electronics as well as the post processing intelligence to do this with much higher quality and exponentially lower cost than other comparables. These oxygenation parameters are just some of our predictors, along with others simultaneously collected by Insight that feed into the algorithms for surrogately measuring lactate threshold curves.

    The concept of measuring surrogate markers to correlate with biologic events/conditions is common practice. In medicine we use surrogate markers all the time to measure things we otherwise couldn’t measure and /or quantify. When we want to know how the kidney is functioning we measure creatinine instead; when we want to assess liver health and/or toxicity we look at the transaminases. By measuring surrogates of lactate we are simply applying the same rigor a physician would use to help him/her understand the body system of their primary interest in a manner that overcomes many of the traditional limitations to blood lactate testing.

    Using NIRS to measure this is a very standard practice which has been well documented in the scientific community for many years. As exercise physiologists though, we were further interested in understanding how changes to these oxygenation and other predictor variables occurred in real time during exercise in peripheral muscle tissue, and how (if at all) these changes could be used to correlate with actionable training decisions that would benefit athletes of all levels.

    We knew that lactate threshold was the gold standard for quantifying endurance performance and the best way for an athlete to personal their training intensities for best outcomes. The problem with LT was it was a blood test and very expensive to complete. We wondered if we could somehow correlate the blood measurements we were noninvasively recording with the blood measurements of a lactate threshold test. In short, we hypothesized that there must be a predictable correlation between local blood oxygenation concentrations and lactate levels. The rationale went as such: muscles extract increasing quantities of oxygen during increasing workloads. This leads to recordable desaturation event. At the same time, increased workloads begin to stress cellular aerobic machinery beyond their capacity to produce sufficient energy leading to a state of acidosis and increasing lactate production. We believed there might be a predictable correlation between the downward flexion of blood oxygenation and upward flexion of lactate levels. Our hypothesized relationship looked something like this:

    [Insert Graph Here]

    In this graph the blue line represent oxygenated hemoglobin and the red line represents blood lactate over the course of an incremental exercise protocol. In the spring of 2011 we then set out to test our hypothesis by running a pilot study of 35 athletes through standard LT protocols while collecting NIRS measurements from our wearable device. As predicted, successive samples at the beginning of the test did not show much variability, and revealed a relative plateau. But as intensities continued to increase, there was a clear downward trend in oxygenation data that accelerated as the athlete increased their workload. When overlayed with the blood lactate samples taken there appeared to be a visual symmetry.
    Initial visual inspection indicated a strong relationship between features measured by our wearable device and the LT sampling protocol. We then used statistical modeling to correlate the two data sets which revealed a 90-93% correlation between the two across our pilot subjects.

    It appeared from our initial research that we had discovered an unprecedented opportunity for measuring the metabolic condition of exercising muscle in real-time and thereby providing both athletes and coaches with powerful predictive training information. This initial proof-of-concept research was completed in 2011 and since then we have continued testing hundreds of athletes (including runners, cyclists, and multisport athletes). Raw data samples look like this:
    Our ongoing research and development efforts have successfully, overcome many of the major hurdles faced by other research groups to make a NIRS based approach feasible for use in a consumer electronic device. Based on further statistical analysis we have developed mathematical models to describe this relationship between BLa and oxygenation for automatic interpretation and recommendation algorithms while the athlete is training (or racing). For the first time ever they can know what is essentially their athletic horsepower and know if they need to speed up or slow down for optimal results.

    Additionally, we have developed novel algorithms that use proprietary machine learning techniques leveraging hundreds of individual subject tests (n=240) to deliver a robust predictor (True Positive Rate > 0.95) of lactate threshold. What we mean by this, is that across all athletes in our sample population we were able to identify the lactate threshold event using Insight with 5% or less deviation from what independent professional assessment determined it to be using traditional blood sampling methods. Those errors measurements essentially represent the percent of deviation from what the blood tests determined an LT to be, and what Insight determined them to be. As mentioned previously, current efforts are investigating how much of this error is due to true inaccuracies in Insight's data collection and/or algorithms, vs how much is due to the increased resolution that Insight has over traditional measurements and therefore represents an overall improvement in accuracy.

    This approach is far superior to the basic regression techniques that have been published to date, because it eliminates the need for the identification of a 'break-point', which is especially susceptible to bias. In addition, our machine learning techniques are data driven, which allow the system to improve its predictive power over time, as more data is collected with each new athlete that trains with BSX Insight. This is why we mentioned increasing our sample size so significantly. The more data that goes into the system. The better it gets!

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  • All of our testing has been to correlate Insight's noninvasive measurements with that of traditional blood lactate testing. At this point, our algorithms are slightly more than 95% accurate at identifying LT. With the increased sampling size (initial sample size was 240 athletes, but we anticipate increasing the training set to n=600-750 by the time we ship the device) and introduction of more sophisticated techniques, our ultimate goal is to increase this to 97%.

    To clarify the 95%, what we mean is that across all athletes in our sample population we were able to identify the lactate threshold event using Insight with 5% or less deviation from what independent professional assessment determined it to be using traditional blood sampling methods. Those error measurements essentially represent the percent deviation from what the blood tests determined an LT to be, and what Insight determined them to be.

    Current efforts are investigating how much of this error is due to true inaccuracies in Insight's data collection and/or algorithms vs. how much is due to the increased resolution that Insight has over traditional measurements and therefore represents an overall improvement in accuracy. In other words, traditional blood sampling is taken every 2-3 minutes. Insight records many times per second. This gives us much greater resolution and theoretically will allow Insight to be more accurate than the old finger-stick method. We believe any discrepancy between the blood and needless method can eventually be explained by the limitations of the old method. These are things we're still investigating.

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  • We've been overwhelmed by the support of the endurance community and the many offers to help test Insight. At some point (relatively soon) in this journey we will need additional beta testers in the field; however, at this point we’re doing most of the testing in our own lab so that we can carefully monitor the correlation between our device and the traditional finger-prick method of measuring lactate.

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    KICKSTARTER EDITION: One-time Multi-sport Edition BSX Insight (gold) with both cycling AND running profiles. We'll never make this color again and each unit will be numbered! Also includes 6 months free trainBSX premium access.

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    A limited edition Multi-sport BSX Insight and 6 months free trainBSX access. Plus, you and a friend will be invited to Houston to meet the team behind BSX Insight and pick the brains of the BSX co-founders. Talk about anything from training to wearable devices. Transportation to and from the airport is included along with a 2 night stay in a 4 star hotel and a Texas-sized steak dinner. Flights are not included.

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Funding period

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