Effect of birth control on building muscle

Hello MFP'ers,

I am on the mini-pill (norethindrone, branded as micronor in Canada), and am wondering what effect it has on building muscle. I've been lifting heavy for over a year now and have developed some very nice muscles. Now I am wondering what impact my birth control choice is having on my muscle development.

I've read an article or two that say some birth control decreases women's ability to develop muscle, but they don't say which ones. Any endocrinologists or gynaecologists in the audience with expertise in this area? Should I go off the pill and try another form of birth control?

It just seems a shame to work so hard if I could be seeing faster gains.

Thanks,
Emma

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