T Nation

Lose 5kgs of Muscle in 10 Days?


#1

I just measured myself on the Tanita body composition machine after a 10 day boozing/bucks party holiday.

Before I went on holiday my body fat had been steadily reducing from 21 down to 15 over a few months.

After the boozing, the machine told me I had not gained or lost any weight, but instead lost 5 kilos of muscle... meaning I had replaced it with 5 kilos of fat...

Seems pretty unlikely no???

Is it even possible to lose 5 kilos of muscle in 10 days?


#2

I assume 5 Kg is about 5% of your body weight, considering that that type of instrument has a 4% error, it's really meaningless. Take multiple reading at different times of day and take the average. I'm still not sure that you will have a reliable reading.

That said, alcohol and partying is very catabolic and it's likely you would have had significant muscle loss. 5 Kg does seem like a lot though.


#3

Alcohol dehydrates so that's probably the biggest issue.


#4

Do a search here on Tanita. They're OK to monitor changes if you always measure under the same conditions but you can't trust them otherwise.


#5

The other factor could be that alcohol is a diuretic. That would affect the readings.


#6

Wait a couple of days, rehydrate and eat some good food - take the measure again.


#7

Dehydration will give you a higher body fat % reading.


#8

OK, so I got a new reading today...

Now I'm 2kgs heavier in body weight

It's telling me I've gained just 0.2 kgs of fat and the rest of the gain is muscle!!!

I should go on 10 day benders more often!

I agree with all your comments, I should just keep measuring and maybe it'll become a little more reasonable....

I just can't help suspect Tanita machines are probably better used as paper weights...


#9

I use an Omron handheld rather than a Tanita. My observed measurements seem to hold within a plus or minus 2.5% range at most, with about a 1% variance being normal.

This is good enough for me because I track daily and use an exponential weighted average with 10% smoothing to calculate the actual number. I found that calipers were more precise but less accurate.


#10

These machines are totally useless crap.
Do you think they can analyze your body composition ?
Bone density ? lean mass ? fats , water.... ?
They can't. They just spit out some info based on statistics.