Final answer:
Growth hormone (GH), which stimulates lipolysis and leads to a glucose-sparing effect, is thought to play a role in the effectiveness of glycogen super-compensation.
Step-by-step explanation:
The hormone thought to play a role in the effectiveness of glycogen super-compensation by stimulating fat metabolism is growth hormone (GH). GH is produced by the anterior portion of the pituitary gland and not only accelerates the rate of protein synthesis in skeletal muscle and bones but also stimulates lipolysis. This leads to an increase in the use of fatty acids as an energy source through a glucose-sparing effect, which indirectly supports the glycogen super-compensation process that occurs particularly in athletes as they load carbohydrates to enhance glycogen stores beyond normal levels.