The problem with NSAIDS such as ibuprofen mainly relates to rhabdomyolysis which is a precursor to kidney failure and death. It’s more of an issue in ultras.
However pain is your bodies way of telling you to stop doing something that is causing damage. Anything that blocks pain during exercise is generally a bad idea regardless of duration.
@ lotto The arm mounted HRM I tried was absolutely useless. The reading was pretty random and would change significantly if I moved the position slightly. It was generally difficult to tell whether it was working till the data was reviewed later. When it wasn’t working the reading might be 10-20 beats out at rest, and would be very slow to change or update. The error would increase at higher heart rates. Also the hrm would often move if I wore clothes with sleeves. Tightening the strap did not help.
Having said that the reason i got it was because chest straps are also poor unless you are hot and sweaty. Trying to base train to maffetone heart rate in a scottish winter is difficult as you don’t sweat enough.
I also find that static from technical t shirt fabrics can affect the reading on chest straps.
I suspect that arm based hrm’s may also be better in warmer conditions as the veins are nearer to the surface of the arm when hot.