To what does 身体的反应能力 refer here? I have this text. I do not understand to what 身体的反应能力is referring. I must be missing something. What is it? Is there a clue in this text?

If you argue with you partner, you may be angry, but what has that got to do with a 'bodily reaction'? Is  the woman referring, in a subtle Chinese way, to: 'No sex after an argument'？

生活中，夫妻之间免不了因为一些事情而争吵。但有研究表明，和爱人争吵半个小时，起码要花一天的时间来恢复身体的反应能力。对于那些经常争吵一个半小时的夫妻来说，恢复的时间还要加倍。有些社会学家做过实验，实验结果表明：需要用五件积极的事情，才能消除掉一件负面事情产生的阴影。

Edit: I changed this a bit for clarity:

和爱人争吵半个小时（的人），（这些人）起码要花一天的时间来恢复（他们）身体的反应能力。
People who quarrel for half an hour with their loved ones need at least a whole day to restore/recover [不知道] 身体的反应能力 ??normal relations??
I think it's better translated as neural response than literally 'bodily reaction' since the neural system controls the reaction of the body.

I'm not a neurologist, but I do have that feeling that if I had a quarrel with someone, I would need some time to restore my spirits, In that period, my reaction to outside circumstance slows down a lot, I'm distressed, distracted and thus can't focus, perhaps some nervous substances not working as usual?

You can imagine that if you quarrel with you GF, even someone throw something at you you wouldn't care that much or you couldn't even feel that.