"One of these elite cyclists will have double that, about 40 litres per minute. They have massive volumes of blood moving through [...] The blood can pool there and that's what's happening in this extreme case. There is blood pooling in his veins which is why you're seeing them (so visibly)."
However, despite how concerned the internet were about his legs, you'll be happy to hear that Poljanski is fine and dandy. A few days later he posted a picture of him and polish racer Maciej Bodnar enjoying a well-earned beer in the pub. I have to say, whilst Pawel's legs certainly show off his all his years of training, I do hope that he takes a very long holiday now the Tour de France is over, where any and every form of exercise is strictly prohibited.
"The amount of blood that we get normally going down to our legs is five litres per minute, for anyone at rest. For an untrained athlete, their maximum exercise will have 20 litres per minute flowing through the muscles."