Training & Nutrition - Losing muscle mass

I have not been riding much this past month, only 10 times in the last 30 days. I seem to be losing muscle mass in my legs. I just noticed it recently after doing a 3 hour mountain bike ride. I do not feel any weaker than before, this season has bean going pretty well, only 482 miles/47 hours so far, but a good bit of spinning unaccounted for as mileage in the first two months. Any thoughts on what I am doing wrong or need to do to change this around?

you may just be losing fat. sometimes overworking yourself can make ya fat. could be water loss. sleeping habits changed?

I'm a bodybuilder/cyclist and I have to really watch what I eat when I change up my routine. Your spinning classes are burning a lot of calories and if you are sacrificng muscle mass, I suspect you need to adjust your nutrition. Mainly, are you eating enough lean protein and calories?

I have not been riding much this past month, only 10 times in the last 30 days. I seem to be losing muscle mass in my legs. I just noticed it recently after doing a 3 hour mountain bike ride. I do not feel any weaker than before, this season has bean going pretty well, only 482 miles/47 hours so far, but a good bit of spinning unaccounted for as mileage in the first two months. Any thoughts on what I am doing wrong or need to do to change this around?

Ever since I started biking, I lost an inch and a half on my waist and gained 5 pounds. You might be losing fat and gaining muscle or getting leaner.

Before you decide if you are really losing muscle mass or not, perhaps it would be a good idea to go in to a health club and let a professional trainer do a bodyfat composition analysis on you first. That way, you can be sure because you never know if you're losing muscle vs. shaved off some fat.

Koffee

Definately get a proper body composition test done like coffee said. You don't want to play with guesswork in regards to loosing muscle and fat.

I should take my own advice. Been eating clean, hiking, biking, hitting the weights, quit the booze and gained 7 pounds in 2 months. Hahaha...