How racing is making strides into ‘Big Data’
/Article by Alysen Miller
Unless you’ve been living under a rock, you may have noticed many male footballers wearing what appears to be a sports bra during training and matches. This is not a political statement, a show of solidarity with their female counterparts, perhaps; nor is it the latest fashion craze. Rather the bras are, in reality, GPS tracker vests. Containing a small Global Positioning System gadget, they allow team managers and trainers to collect and analyse players’ individualised GPS data in order to make informed decisions about tactics and training.
Like all big-money sports, the top football clubs now employ legions of data nerds to crunch the numbers on all aspects of their players’ performances. Premier League football club, Arsenal, uses the STATSports system to gather physical data on all their players, from the under-12s to the men’s and women’s first teams. Marketed as “the most advanced wearable tech on the market” (that’s the famous bra), it records some 250 separate metrics, including accelerations and decelerations, average heart rate, calories burned, distance per minute, high-speed running, high-intensity distance, max speed, sprints and strain. The statistics are available live during training sessions so coaches can make real-time adjustments where necessary.
And it goes beyond wearable tech. Players at last year’s World Cup in Qatar were able to get insights into their on-field performance through FIFA’s own player app. Physical performance metrics were collected through a highly accurate in-stadium tracking system, including multiple cameras located around the pitch. These included distance covered at various speed thresholds, number of actions above 25 miles per hour (about 40 kilometres per hour), and maximum speed – all displayed on positional heat maps. Thanks to this data, we know that Kylian Mbappé hit a top speed of 35.3 kilometres per hour (about 22 miles per hour) against Poland in the round of 16. Impressive for a two-legged athlete, even if he won’t be giving the likes of Flightline or Baaeed a run for their money.
Football is following in the footsteps of baseball and American football by embracing “Big Data”. Not only does this enhance teams’ abilities to play and train, it adds another dimension to the spectator experience. Who doesn’t want to know how far their favourite player ran? Horse racing, by contrast, still relies on a mathematical speed model, Timeform, developed in the 1950s.
“When you look at other professional sports, racing’s a fair way behind in terms of how we measure the athlete,” says David Hawke. “Basically, we don’t measure the athlete in a biometric sense at all, whereas most other professional sports measure their athletes in competition, when the athletes are at their highest output and highest exertion. And this is the crucial point.” Hawke is hoping to change all that. He is the managing director of StrideMaster, a system that combines GPS and motion capture technologies to produce detailed insights into the horse’s performance.
“When we developed the technology, back in 2010, it was essentially technology for race day: tracking horses, getting all their times—all the normal race track performance information that punters might want to see,” he explains. In the course of gathering this information, Hawke accumulated a treasure trove of biometric data. In 2018, he joined up with Dr David Lambert. Kentucky-based Dr Lambert is an expert on equine physiology and the founder of a company called Equine Analysis Systems, which leverages this understanding of how the horse moves to select elite, high-performance thoroughbreds.
He is looking for the top one percent, the cream of the crop. Hawke’s idea was to take this hypothesis and turn it on its head; in other words, to find the one percent “who were in trouble.” In this way, by identifying the horses that are trying to cope with a problem, vets and trainers would have a crucial data point which could be used to help prevent injuries before they happen.
So how does it work? Here comes the science part. Essentially, every horse has a unique stride “fingerprint.” Thanks to Hawke’s data, we not only know what that fingerprint looks like, but also when the horse deviates substantially from that fingerprint.
The first step is to collect high-resolution data of the horse at the gallop. This is because, as prey animals, horses are disinclined to show lameness at the walk or trot (the traditional way of assessing a horse’s soundness). “The forces that are at play when a horse is going at 40 miles per hour compared to when it’s being trotted up at five miles per hour are completely different,” says Hawke. “The price that the horse pays for going fast is that it gives up autonomy over a number of things,” he continues. “It gives up autonomy over its breathing, for example. It becomes a mechanical breather. It also gives up autonomy over its footfall. If it’s got a raging foot abscess at the walk or the trot, it will decide not to put its foot down. But at the gallop, it can’t do that. It has no choice over when it puts each foot down. So the only option it’s got left to manage an issue that’s impacting it is postural change: it’s going to hold itself differently; it’s going to use different muscles to try and take the pressure off.”
To capture these changes, samples are taken from three axes: the vertical, the longitudinal and the medial. This data is captured by a device about the size of an iPhone that’s slipped into the saddle cloth. These samples are then broken down further: “We split the stride up into three parts,” Hawke explains. “We have the hind leg stance phase, which is the primary propulsion and power source for the horse. Hind leg spring function is absolutely critical to a good stride, so if anything’s wrong at the back end, that immediately gets transferred to the front end on the corresponding diagonal. Then we have the forelimb stance phase. And then we have the flight phase, or the collection phase, when the horse is off the ground. The flight phase is where the horse is making most of its postural adjustments in the air. So if it’s got a problem it’s managing, it’s trying desperately to accommodate that problem during the stride. And then when it goes into the air, it’s trying desperately to get itself ready for the next stride to do it all over again.”
The system is capable of detecting minute variations in the horse’s stride that are effectively invisible to the human eye. “From an observational point of view, humans can’t detect these sorts of changes that we’re picking up. It’s simply happening too fast,” he says. The sample rate in StrideMaster’s sensors is 800 hertz, or 800 frames per second. The human eye, by contrast, cannot directly perceive more than about 60 frames per second. “That enables us to look at the stride in a very high level of detail,” he says.
Hawke has accumulated so much data that it’s no longer necessary to have historic data on an individual horse in order to make a judgement about its soundness. Rather, there exists an “ideal” fingerprint for different categories of horse: “We have a Gp.1 fingerprint, we have a Gp.2 fingerprint, right down to a $10,000 claimer fingerprint, to use the American parlance,” he explains. In other words, soundness can be assessed against an ideal archetype. If a horse is more than two standard deviations outside of this ideal, that is considered an adverse change that the system then flags for the attention of the trainer.
So how is this “deviation” measured? “We’re tracking two or three things that are important: we’re tracking the amount of power they produce, and we’re tracking the amount of vibration they produce,” Hawke explains. Vibration is, essentially, any rapid change in acceleration. That is what is most likely to cause injury. Think of the horse as a four-cylinder engine, with the legs as the pistons. Each piston—or leg—moves in a set rhythm. As long as this rhythm is maintained, vibration will be kept to a minimum. But changes in rhythm (for example, because the horse is managing a problem) generate vibration which, in turn, generates damage. The sounder the horse, in other words, the less vibration. But with great power comes the potential to generate huge amounts of vibration. This explains why most of the horses that get flagged are competitive horses in whatever cohort they’re in. “They’re not horses that are running 20 lengths down the track,” says Hawke. “Generally, those horses are not producing enough power or vibration to get themselves into trouble. [The good horses] will always find a way to go fast,” he says.
While Hawke sees the technology primarily as an injury prevention tool, he acknowledges that its potential is broader than that: “From a social licence point of view, that’s where the pressure is: to manage these injury rates and welfare outcomes better than we have been. So that’s the primary focus,” he says. But the same technology could, in theory, be used to identify future elite performers:
“When you compare, say, a Gp.1 horse to a low-rating handicapper, what we see is increased deviation from optimum,” he explains. “To take a metric at random: gravity. The acceleration of an object toward the ground caused by gravity alone, near the surface of Earth, is called ‘normal gravity,’ or 1g. This acceleration is equal to 32.2 ft/sec2 (9.8 m/sec2). If you drop an apple on Earth, it falls at 1g”.
“The Gp.1 horse will be much closer to that 1g than the lower rating handicapper,” he explains. “[The lower-rated horse] is not as efficient. They’re losing power in all directions. They’re going up and down more, they’re going side to side more. Whereas the elite horse actually generates surprisingly less power, but it’s all pointing down the road in the right direction.”
Hawke is keen to emphasise that he is not marketing a diagnostic tool. Rather, trainers should see this technology as another tool in their toolkit: “When the trainer gets the information, either they come and seek more information or talk to their vets about what’s going on. The vet can review the stride on a stride-by-stride basis. And when we get down to that level of detail, we can actually, on most occasions, give some indication of what quadrant the problem is emanating from.”
But what if you could identify such problems without even galloping the horse?
Stephen O’Dwyer thinks he has a solution. O’Dwyer is the founder of Irish start-up TrojanTrack, which uses video cameras to record the horse at the walk and, from there, identify any variations in its movement. “We take video data of 52 different parts of the horse at 120 frames per second,” he explains. “We then convert those parts into biomechanical data: joint velocities, accelerations, angles. And then we can compare that to the horse’s healthy baseline movement to track any deteriorations or imbalances that might be creeping in.” But wait. Horses are prey animals. Won’t they naturally try to mask any injuries at the walk? “Horses are herd animals, so rather than show any sign of injury, they try to hide it as much as possible, and that means compensating on a different limb or something like that,” O’Dwyer acknowledges. “But because we’re tracking 52 points, we’re able to pick up any tiny deviations, tiny nuances that won’t be picked up by the human eye.
“In talking to a few of the vets, they say that when the horse is in its walk, it’s at its most comfortable,” he continues. “And because they’re in their most comfortable state, they won’t be trying to hide their injury as much.” O’Dwyer plans to incorporate trot movements in the future.
Like Hawke, O’Dwyer sees his technology primarily as another arrow in the trainer’s quiver, rather than a diagnostic tool. “It’s hard for the trainer to pick up on the whole horse at once,” he explains. “They might be staring at one limb while the hip isn’t moving, and they’d have to walk by again and check the hip, and then they’re not looking at another limb. We look at all four limbs landing, the hip movement as one of the limbs is landing. So it’s the whole package of the horse in one to really show the trainer exactly what is going on.”
O’Dwyer acknowledges that the technology is still in its nascency. He is currently running customer trials a couple of yards in Ireland while he tries to drum up the next round of investment. StrideMaster, meanwhile, has been adopted by racing authorities in the United States and in Hawke’s native Australia. But any technologies that can help spot potentially catastrophic injuries before a horse hits the track must be taken extremely seriously by an industry that can, at times, feel like it is operating on the razor’s edge of public acceptability. As Hawke says, “The first priority is welfare because we have to look after the animal. If we’re not seen to be looking after the animal, the whole game’s in trouble.”
It seems like it is only a matter of time before racing joins the ranks of other sports in embracing Big Data. Says Hawke: “If I walked into a major football club and said, ‘Who here’s got expertise in biometric sensor analysis,' half the football department would put their hand up because they’ve been doing it for 20 years. But the information can be used in so many different ways in terms of performance, breeding and training techniques. We’re just scratching the surface.”
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