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Bit of a long post but just giving all the details, would be interested to hear any peoples thoughts on what is happening here.
I have been running for around a year and have slowly increased my stamina and distance over that time. I only run on a treadmill in the gym, and always run at a 12kmh. 2 weeks ago I was at the point where I the maximum distance I could run was 20k in 1 hour 40 minutes. I would do this distance once a week and on 2 or 3 other days a week would just run 10km or 12km or do some interval training and sprints
I was at the point where I could happily run 10km in 50 minutes without really breaking a sweat, and by the end my heart rate would be around 155bpm. Usually the first 30 minutes or so my heart rate rises to around 145bpm right away and then sits there.
However the last week, I have tried to run 3 times and each time within 10 minutes my heart rate is in the 150's and by 30 minutes is in the 160's and by the time I get to 9km I am absolutely done for, have not been able to even reach 10km, let alone any further.
My resting heart rate is between 39-42bpm. I have always had low blood pressure, usually around 110/70, though this week I have had it taken twice (at the doctors) and it has been 96/62 which although low, they say that is fine.
I have not changed my diet or my routine in anyway. I am generally very fit and over the last year have reduced my weight from 190lbs to 150lbs which I have been for a couple of months. I recently had a full 360 health assessment through my job now which gave me a clean bill of health and stated I was very fit, and had a body fat % of around 11%.
I have had a search around the net for information regarding why this might be but have got no where, so am curious if anyone here may have an insight as to why all of a sudden my stamina has plummeted and my max distance has halved ?
Any advise welcome, thanks for taking the time to read all this.