Final answer:
Rest time between sets should be 1 to 2 minutes to maximize serum testosterone levels and growth hormone levels for the given exercise protocol.
Step-by-step explanation:
Rest time between sets can have an impact on serum testosterone and growth hormone levels during exercise. Research suggests that shorter rest periods of around 30 to 60 seconds promote a greater release of testosterone and growth hormone, while longer rest periods of around 3 to 5 minutes are necessary for complete recovery and performance in strength training.
For the given exercise protocol of three sets of 8 to 10 reps at 75% of the 1RM, it is recommended to take rest periods of 1 to 2 minutes between sets to maximize serum testosterone levels and growth hormone levels.
It's important to note that individual response to rest time can vary, and it is advised to consult with a qualified fitness professional for personalized guidance.