Question: Hi am a 54 year old male. I have increased the number of days I workout from 3 to 5 days a week for the past 2 months. I have also started running more. My workout s1chedule is Monday -5 K run, Tuesday - 1to 1.5 hrs of Table Tennis, Wed - Weight Training ( mostly anaerobic), Thu - 10K run, Friday - 1 -1.5 hrs of Tennis/TT, Saturday - Weights. Also since 2 months I have been under stress with job. I do suffer from GERD with bad refluxes some days. I take Nexium 40 as needed. With this background, here is my question - 1) Over the last 2 months since I began working out regularly and running more I see that my resting heartrate has constantly reduced ( as seen on my Fitbit) from being around 52 bpm to last night when it 45 bpm. 2) I do not get winded climbing up the stairs or tired easily - I can run a 5 K comfortably with ~ 10.45 min/mile. 3.) I do suffer from GERD 4). I don't feel much tired during the day, but do feel a little sleepy after lunch - a 15 minute nap or a coffee refresehes me. 5) But I do not get more than 4-5 hours of sleep, I lie down for 7 hrs though.

With the above background , Is this lowering of Resting Heartrate (Bradycardia) a good sign or something to be concerned about. The last Treadmill test about a year ago, the cardiologist mentioned that though my resting HR was ~ 53, the stress response was normal and there was no need for concern. But wanted to get an opinion now since my resting HR is ~ 42-45!

Thanks for the response and it is reassuring. Is there a lower limit of resting heart rate below which is of concern. I am very active alright, but by no means a triatholon or marathon athlete. With that do you think 45-46 average resting HR ( occasionally goes down to 39-40) is still ok?

Thanks. There are no excess fatigue, shortness of breath or palpitations. Only one or two days following my 5K and 10 K runs, I will be sore and a little tired. But ever since I have ramped up my exercises, I feel hungry all the time. Also I have seen my blood sugar drops to almost 70 ( one day was 57) if I do not eat for 4-5 hrs. Are all these normal with increasing exercise/physical activity.

Attached are three reports from an App called Preventicus which measures HR and Rhythm using the iPhone's camera. Has good reviews. Just attaching FYI and to comment if you see anything of concern. Thanks for all your inputs!