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When your muscles burn, it means you have gone from aerobic respiration to anaerobic respiration. Aerobic respiration, or cellular respiration, uses oxygen to produce the ATP your muscles need to function. When you run long enough or fast enough, however, your muscles run out of oxygen and must turn to anaerobic respiration, which also produces ATP but has lactic acid as a waste product. It is the lactic acid that makes your muscles burn and makes them sore afterwards and the next day.

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15y ago
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13y ago

You are using your legs when in a race, so those muscles are susceptible to "burning," or losing muscle mass.

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13y ago

Lactic acid builds up because of lactic acid fermentation.

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Q: Why do muscles burn while running?
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Related questions

What muscles are used while running?

Mostly your Quad muscles


Do you lose weight when you go running?

Running raises our metabolic rate, so we burn calories even while at rest. Running helps to burn calories while watching TV, while sleeping, even while taking a shower.


Does running on the spot give you as much as running?

No it doesnt you need to move your legs so you can use all of your leg muscles which causes you to burn more calories otherwise you are only using your calf muscles


What muscles are active while running?

Your triceps and biceps. Your calfs and thigh muscles. there, i think, are muscles in your tourso that are active. then your heart and lungs.


Can you burn fat while smoking marijuana?

yep like if you running whilst smoking you burn fat


How much does running affect weight loss?

Running does affect weight loss pretty significantly. Running is a pretty good form of cardiovascular exercise that can help you burn your excess fat and build your muscles.


Who many muscles work while running?

Quite a few muscles go to work while running. While there are the obvious muscles (Such as calf, thigh, hip, and hamstrings) other muscles are subtly at work also. The abdominal muscles are slightly worked, along with the arms and back muscles. The arms are constantly swinging, going against air friction/wind during the run. Your back helps keep you in the upright position and is constantly shifting while you take each step. So pretty much your entire body goes to work while running (even your toes which push you off the ground). Hope that helped :)


How many calories do you burn while running at around 6 MPH?

Around 800.


How do I burn calories best when running?

The best way for you to burn lots of calories while running is to run up hills or at an incline. If that is not an option you can also run up and down stairs those provides a lot of burn calories.


Why stomach pain occur while running?

Pain in the stomach while running is called a side stitch. This may be due to membranes and muscles rubbing against each other.


What is the difference between running a mile and swimming a mile if you are counting calories burned?

If you are swimming at a pretty decent pace you should burn more calories than running because you are using more body muscles, like your arms, legs, back muscles, and abs.


Why does fat burn while you exercise?

Because exercise works Ur muscles which causes the fat cells to shrink! :)