Losing muscle mass after 1 week of not working out?

So I got one of those (cheap) scales that measure bodyfay, muscle mass, etc. It might not be 100% accurate, but it is very consistent in it's measurements.

I've only been working out seriously now for about 10 weeks now. During the first 8 weeks, my muscle mass slowly but surely increased. At 8 weeks I was up about +2kg / 4.4 lbs. Also gained some fat which wasn't my intention since I'm skinny fat, but hey, at least some progress.
Then I got a small injury in my arm and thought it could be time for a rest week, so in week 9 I only trained once, lightly. After that week I measured again, and I lost about a 1kg / 2.2 lbs of muscle mass according to the scale. After working out twice again in the week after, I'm back at where I was in week 8 give or take.

How does this work? Is this thing really measuring muscle mass correctly? Or is it just water rentention from temporary swollen muscles? Or is that a precursor of growth?

I don't see much in the mirror yet, but that might be because I'm still only at 10 weeks and have a pretty high percentage of BF.


Thanks!


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