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in muscle fiber proportion.

Testosterone

During puberty in males, hypertrophy occurs at an increased rate.Natural hypertrophy normally stops at full growth in the late teens.As testosterone is one of the body's major growth hormones, on average, males find hypertrophy much easier (on an absolute scale) to achieve than females.On average, men have about 60% more muscle mass than women.

Taking additional testosterone, as in anabolic steroids,

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