"Lean muscle increased by just 2.1 percent in OC users compared with 3.5 percent in non-OC users.
"The factors that explain the differences in the magnitude of the
responses to resistance exercise training between individuals are
largely unknown," Chang-Woock Lee, from Texas A&M University in
College Station, told Reuters Health.
"The present study is meaningful in that we have identified a
potential new factor that may be independently associated with the
characteristics and variability of muscle responses to a controlled
resistance exercise training program," the researcher added."
In others, the women using the pill had a much harder time building muscles mass which is a critical component to not only strength training, but also speed in endurance sports such as running, biking, swimming. and triathlon.