Muscle fatigue is caused by accumulation of muscles?

Muscle fatigue is caused by accumulation of muscles?

پٹھوں کی تھکاوٹ پٹھوں کے کیا جمع ہونے سے ہوتی ہے؟
Explanation

The presence of lactic acid in milk is due to the fermentation of lactose caused mainly by lactic bacteria