How do you Lower your heart rate during exercise without lowering workload or cycling speed?

hi the things which determine your heart rate on the bike is . the load your pushing and the cadence<how fast your turning the pedals>. the only way to get a lower heart rate is to become fitter, there is no magic trick to lowering it. if you drink coffee all i can suggest is don't drink coffee,that will help. but other than that you need to just keep at it until your cardio system gets stronger and healthier