There are certain measures you can take to temporarily increase your "Human Growth Hormone" (HGH) levels. Two of them being fasting intermittently and having short rest periods in between sets [1, 2]. .
But these acute increases in HGH do not seem to result in more muscle growth since anabolic hormones need to increase drastically for an extended period of time to enhance muscle growth [3-5]. Not to mention that HGH does not have a strong relationship with hypertrophy in the first place . .
This helps explain why experimental research investigating the effects of intermittent fasting and short rest intervals do not find greater muscle growth [7, 8]. .
Intermittent fasting is still a solid fat loss tool with great benefits and you can shorten your rest periods if you want shorter workouts, but you should not expect a magical increase in muscle growth because of a temporary HGH spike. .