What is the fine-grained topic of the following text: Testosterone exerts the majority of its effects by initiating gene transcription in a very specific manner, thereby promoting increased nitrogen retention in the muscle.Testosterone is also known to increases levels of the growth factor IGF-1 in both the muscle tissue as well as the liver.Testosterone also increases the activity of satellite cells,which are cells that play an active role in repairing exercise-damaged muscle. Only return the topic.
Effects of Testosterone on Muscle Growth and Repair