Lactic acid build-up causes a burning sensation in your muscles during intense exercise. Lactic acid is not responsible for sore muscles the day after exercise, contrary to popular belief.

Your muscles get tired due to repeated use, lactic acid buildup, dehydration, poor nutrition, underlying health conditions, and lack of rest. Read on to know more about it.

As the time of pedaling increases, oxidation products (lactic acid) build up in the muscles and fatigue starts to decrease the sustainable power. At long times the steady state energy conversion ...

So when there's too much lactic acid, that would secrete into the muscles, and the muscles would start to fatigue, they'd start to slow down. And then after a while, they would start to cramp.

The resulting lactic acid accumulation impaired skeletal muscle relaxation, causing the (involuntary ... anaerobic/catastrophic model is the exclusive explanation for the fatigue that develops during ...