Fatigue evolved to protect us from overexertion and injury.
疲劳是为了保护我们免于过度劳累和受伤而进化的身体机制。
心理学小课堂
This can also be a by-product of tension due to overexertion of the muscles.
这也可能是由于过度使用肌肉导致的紧张的副作用。
哈利波特与混血王子
" I'm afraid that would come under the heading of 'overexertion'" , said Madam Pomfrey, pushing him firmly back onto the bed and raising her wand in a threatening manner.
“这恐怕属于‘用力过度’，”庞弗雷夫人坚决地把他推回床上，威胁他举起魔杖。
英语百科
Exertion
Exertion is the use of physical or perceived energy. It normally connotes a strenuous or costly effort related to physical, muscular, philosophical actions and work.