metabolic stress

You mustn't get stuck in a dogmatic routine following an arbitrary rep count simply because that's what you've always thought was best.
While it's contrary to a lot of popular fitness culture, the gym isn't the only place where you can lose weight, build muscle, and improve your performance.
With three to 8 weeks completely off training, you will lose some muscle. The good news it only takes 2-3 weeks to retain it.