What’s Really Happening To Tour de France Riders’ Legs…

Because it looks crazy.

Selene Yeager |

Last year, Bora-Hansgrohe rider Pawel Poljanski broke the Internet after Instagraming a photo of his “tired legs” following stage 16 of the Tour de France.

After sixteen stages I think my legs look little tired 😬 #tourdefrance

A post shared by Paweł Poljański (@p.poljanskiofficial) on

The sprawl of veins punching through his paper-thin skin looked like a host of spiders throwing a web-weaving rave. Heck, even my mom reposted it asking, “Does this hurt?!” Other slack-jawed observers wondered if such a vascular look was worth aspiring to or whether Poljanski was simply a freak of nature.

And Poljanski isn’t the only one. Team Sky shared a dramatic photo of Chris Froome’s legs back in 2014, and Antoine Duchesne also shared a photo of his after training for the Tour before missing the selection in 2017.

Almost every year, a similar photo from a pro cyclist on the Tour pops up. And while these photos are jarring, vascular legs don’t actually hurt (though the efforts to get there usually do). As for the rest of the questions, we tapped vascular expert Debabrata Mukherjee, M.D., chair of the department of internal medicine and chief of cardiovascular medicine at Texas Tech University Health Sciences Centre, to find out what’s really going on here.

“These prominent veins are due to a combination of low body fat and significant increase in blood that flows through the legs of high level cyclists,” Mukherjee says. Tour de France riders have minimal body fat, so there’s no soft layer under the skin to mask the veins, which are essentially sitting closer to the surface.

“High level cyclists also have double the blood flow to their legs compared to recreational exercisers,” he explains. So while you may have about 20 litres a minute coursing through your pistons as you ride, a pro like Poljanski pumps around 40 litres a minute through his pedal pushing muscles. “That contributes to bulging prominent veins,” Mukherjee says.

And if those metabolic changes don’t pump you up enough, blood pressure increases during exercise can force plasma fluid out of your thin vessel walls and into compartments surrounding your muscles. This process, known as filtration, causes swelling and hardening of the muscle, which nudges all those bulging veins even further to the skin’s surface.

Should you aim to create your own vascular network to share on your social network? Not necessarily. Though they may get a lot of attention, prominent veins in and of themselves are not particularly beneficial, and like diamond carved calves and second knee cap quads, not every rider is genetically wired to achieve the same aesthetic. That said, Mukherjee says a few more veins rising to the surface is definitely an indicator of improving fitness or decreased body fat.

“Since it reflects lower subcutaneous fat and higher blood volume, the harder a cyclist trains the more prominent the veins will become,” he says. “It is something that may tell an athlete that he/she is getting to a higher level of performance.”

This article originally appeared on bicycling.com.

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