There are a growing number of wearable devices that will analyze your biomechanics, mostly from small startup companies, though the bigger players are also contributing to the space. Many of these devices a making use of the cheap and accurate accelerometers that are now readily available, though there are some other approaches being used.
=Garmin's Running Dynamics=
Many newer Garmin watches ([[Garmin 620| 620]], [[Garmin 920XT| 920XT]], [[Garmin Epix| Epix]], [[Garmin Fenix 3| Fenix 3]], etc.) combined with a special chest strap will provide extra metrics that can give insight into your Running Form. The Garmin watches will provide these metrics in real time, allowing you to see the effect of changes in your form. These metrics include:
|[[File:MilestonePod 6.png|none|thumb|200px|A sample of the graphs in the app.]]
The [[BSX| BSX Lactate Threshold Monitor]] attempts to estimates your [[Lactate Threshold]] by measuring the oxygen saturation of the blood within your muscles. The results of the first version were extremely disappointing, but I have not had the opportunity to fully test the updated hardware. However, even if the BSX works perfectly, its value is limited by the relative ineffectiveness of [[Tempo Runs| Lactate Threshold Training]]. You can read about my testing at [[BSX]].
[[File:BSX1.jpg|none|thumb|x300px|The dashboard view of the BSX app, showing previous results.]]
[[Moxy]] uses the same approach as BSX, using infrared light to detect the oxygen saturation of the muscles of blood. Moxy is not as easy to use as the BSX, but it's the data seems to be rather more reliable, though it requires rather more effort to interpret.
[[File:Moxy Test 20150823 0825.jpg|none|thumb|800px|Here data from a Moxy test, showing a clear decline in SmO<sub>2</sub>.]]
The [https://www.amazon.com/Sensoria-Fitness-Socks-and-Anklet/dp/B019RWCWCA Sensoria smart socks]] are made of materials that can detect pressure changes under your foot and transmit them back to anklet that communicates with a smart phone via Bluetooth. The anklet also includes accelerometers to enhance the data gathered from the pressure sensors. While these socks are interesting, unlike a true pressure plate that has a matrix of pressure sensors, the socks have just three sensors, one in the heel and two in the forefoot. <jfs id="B019RWCWCA" noreferb="true"/> for a pair of left & right socks, plus one anklet. Note that the socks last for 60 washes and cost $45, which works out to $0.75 per run. That might be cheap to a triathlete, but to most runners that works out pricy. I have a Sensoria anklet on order and I'll report back soon.
Like many other devices, Lumo uses accelerometers to measure body movement, but uniquely (so far) Lumo places the accelerometers at the small of your back. This allows Lumo to not only detect [[Cadence]] and Vertical Oscillation, but also breaking and pelvic movement. The measurement of braking force is rather different from [[RunScribe]], as Lumo measures how much your overall body slows up with each stride, rather than measuring the deceleration of your foot in touch down. I believe that both approaches are important, and give valuable insight into possible biomechanical problems. In addition, Lumo will measure how much your hips (pelvis) will drop from side to side, and how much it rotates (twists). Lumo is not yet shipping, but the preliminary price is $80, which is fairly reasonable for this type of device. I really wish that Lumo would measure impact, as it would be great to know how much of the foot strike impact reaches the hips. I am planning on testing the Lumo in the near future.
Power meters have helped cyclists for a number of years, providing a valuable metric around how hard the cyclist is exercising. Stryd is attempting to provide a power meter for runners, which superficially sounds like a good idea. Certainly, there are many problems with using Heart Rate to determine training intensity, and measuring VO2 is only practical in a laboratory, so and a power meter could be a better option. However Stryd actually measures movement and then calculates power. The details are a little unclear, as their website does not explain their approach or a well, nor do they seem to be any validation studies that I could find. It seems that Stryd measures Vertical Oscillation
as the primary metric, along with Ground Contact Time , from a chest strap, so it 's a lot like Garmin's [[Running Dynamics]]. It seems likely that you could perform similar calculations using the Garmin system, but I find myself unconvinced by the approach.
Zoi is unique in that it places sensors on both the foot and the torso. This allows it to gain a little more insight than other sensors as it knows about the movement of the foot and the torso independently. Eventually I expect to see a company produce a group of sensors placed on each foot, each knee, and the pelvis, which would give insight into the movement and impact forces across most of the body. In the meantime, Zoi is the only "multizone" sensor. It only has one Footpod, so it doesn't give you detailed foot strike information in the way that [[RunScribe]] can, though you could see them adding that functionality in the future. The Zoi gives quite a few metrics, including [[Cadence]], Ground Contact Time, Vertical Oscillation, breaking (at the torso, not foot breaking), of [[Foot Strike]] type (fore, mid, heel), Foot impact, and some [[Pronation]] information. Zoi has a smartphone app that provides real time feedback and post-run analytics, but I've not seen any support for displaying metrics on a watch. Currently Zoi is on pre-order in Europe for 150 EUR. I'd like to test this system if I can get hold of one.