I’ve done it a couple times. It stopped once I started wearing a heartrate monitor on leg days. I started wearing a heartrate monitor when hiking above 10,000’ feet and noticed I couldn’t maintain a good pace.
The monitor told me it was because even maintaining a walking pace uphill with a pack would shoot my heartrate into the 170’s. That gave me the idea to wear it on leg days. First day I did it I maintained my normal routine and noticed my heartrate was getting just over 170 after a set, dropping to 140 before starting the next set, and hitting 180 by the end of that set…which would cause me to feel lightheaded.
Now I aim for just over 160 at the end of a set, then don’t start the next set till I’m back below 130. Often times my legs feel like they can do much more when the monitor tells me my heart is already maxed out.