usually what I see is carb cycling...where calories don't change too much, but you change your macro ratios. such as more carbs on weight training days, and less on rest or cardio days, increasing fats and protein in take to make up for it.
there's plenty of info out there on carb cycling, even seen some for bulking phases...moderate carbs and heavy carbs centered around the days you train weak areas of they physique.
some are good, some are gimmicky...some people respond better to them, others do better on a very consistent macro ratio/calorie intake.