Which hormones are highlighted as important for athletic development?

• A. Insulin, IGF-1, and HGH
• B. Testosterone, IGF-1, and HGH
• C. Cortisol, adrenaline, and thyroxine
• D. Estrogen, progesterone, and prolactin

Answer: (B)

Athletic development in response to training is driven by anabolic hormonal signaling that promotes muscle growth, repair, and adaptation. The best-supported trio for this process is testosterone, IGF-1, and growth hormone.

Testosterone provides a strong drive for muscle protein synthesis, increases muscle fiber size, and supports recovery after workouts. IGF-1 acts as a key mediator of growth hormone’s effects and directly stimulates muscle growth by activating signaling pathways that promote protein synthesis and satellite cell activity. Growth hormone raises circulating IGF-1 and also supports lean-tissue growth and recovery through metabolic effects. Together, these hormones create the hormonal environment that most effectively supports hypertrophy and athletic development.

Other options involve hormones more linked to stress (catabolic processes), energy metabolism, or reproductive function, which are not the primary drivers of athletic muscle development in the same way.