Heart rate and sport

I do a lot of sport in my free time. Thanks to my sports watch, I have now noticed that my heart rate is often very high and it doesn't feel any less high, even though I sometimes go at a moderate pace. Is it because of my asthma medication? (I take Foster Nexthaler for long-term therapy and Salbutamol before exercise). I also sometimes have headaches after light exercise, does anyone else have similar symptoms/ problems? Thank u!