Hi, my name is Shane Paul O'Neil from City Coast Multisport. I'm here to talk to you about muscle fatigue in sprinting, commonly known as rig. Sprinters generally called muscle fatigue in sprinting rig, short for rigarmortis. And it's simply because you start to feel very, very stiff. While it sounds like a major, major, event, very unusual, it's actually quite common in sprinting. What's actually happening is your muscles are building up lactic acid.
Unlike distance runners who are working more aerobically, sprinters are using what is called anaerobic lactic. Which essentially means they're not using oxygen to fuel their muscles. When the energy within the muscle itself wears out, it starts to produce acid and your arms start to feel very heavy and you'll feel a burning sensation.
The truth of the matter is you can't really fight rig. The best thing you can go is just understand that it's coming on and try to relax. The truth be told, when sprinters sprint, they're actually decelerating the entire time, you don't get faster. So if you're running at the end of your 400, or even at the end of your 60, just know that everybody's feeling the same way. Relax your shoulders, relax your body, and try to maintain proper form as much as possible. And that's how sprinters fight rig or muscle fatigue.