I need your advice because my heart rate over the past few months has gotten real low when I am cycling. I commute to work, and I do longer rides over 40 miles on the weekend days.



My normal average after a vigorous ride was always in the 120s or 130s, with a high around 160 or 170. Now my average heart rate is below 110.



For example, today I biked with Ellen and Darcy. We did a 55 mile loop with lots of head wind and rolling hills, so it was a physically demanding ride. We stopped for a nice lunch. At the end of the ride, both Ellen and Darcy had average heart rates in the low 130s, including the time spent at lunch. My average heart rate was 105.



I don’t know why my heart rate won’t go up when I ride. I’ve examined everything. I’ve taken rest days. I make sure I stay hydrated. I eat enough. I push myself on every ride, and I even experimented with cycling in higher gears.



Can you tell me what is happening?



Suzie