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Sports physiotherapist Ben Warbuton explained that these masks are traditionally used in controlled environments, such as on a treadmill or exercise bike, to assess fitness levels. However, Real Madrid have adapted the technology so it can be used during normal training sessions.<\/p>\n
“They’ve got hold of high-tech equipment to complete it during training,” Waarbuton said. “This benefits the coaches because they can test the players and train at the same time.”<\/p>\n
He added that traditional VO2 max testing can be impractical during the season. “If all players did a treadmill or bike test, it would be very time-consuming. They would lose a training session, and a treadmill is a harder and different surface to grass,” he explained.<\/p>\n
By integrating the masks into football-specific drills, Warbuton says there is also a reduced injury risk. <\/p>\n
“By wearing these masks in training, there’s a slight decrease in the risk of soft-tissue injuries, such as tight calves. They don’t waste a session and still get valuable fitness information.”<\/p>\n
The data gathered allows staff to assess each player’s condition and tailor workloads accordingly. <\/p>\n
“The results will tell the coaches how fit the players are,” Warbuton added. “They’ll compare them to their own baselines, or to other players in the same position. Players with a lower VO2 max may need extra fitness and conditioning work.<\/p>\n
“It’s just one way of looking at a player’s conditioning levels. I imagine it’s very expensive, which is why not all clubs adopt it.”<\/p>\n
This article is the latest from BBC Sport’s Ask Me Anything<\/i><\/a> team.<\/p>\n<\/div>\n