The term "adrenal fatigue" is perhaps not totally scientific, but it's a reasonable term which describes what overtraining feels like and how to get out of it. A good way to think about it is that your HR increases in response to increases in activity. As we know, first the activity goes up, then HR follows. But how? Here's an explanation:
https://www.mytutor.co.uk/answers/88...se-to-exercise
But again this explanation skips a step:
This drop in pH is detected by specialised chemoreceptor cells located in the walls of the carotid artery (at the point where the common carotid bifurcates in the neck). These cells send this information to the Cardiac Acceleratory Centre in the Medulla Oblongata in the Brain Stem. In response, The CAC in the Medulla increases the FREQUENCY of impulses along the SYMPATHETIC chain of the autonomic nervous system which terminate on the Sino-Atrial Node in the heart.
Yes, but how is this information transmitted to the Medulla?
Here's another typical medical explanation which skips this key question:
https://courses.washington.edu/conj/heart/exercise.htm
But here's an article about heart rate monitors which does talk about it:
https://www.heartmonitors.com/blogs/...the-heart-rate
From this site, the two channels of the autonomic nervous system originate the sympathetic and parasympathetic components. The sympathetic components increase heart rate by releasing the neural hormone catecholamines - epinephrine and norepinephrine. These hormones are cardio accelerators. Acceleration of the heart rate is called tachycardia.
The parasympathetic nervous system located in the brain stem and upper or sacral portion of the spinal cord slows heart rate. The parasympathetic components decrease heart rate. These neurons release the neurohormone acetylcholine, which inhibits heart rate. The slowing of heart rate is called bradycardia.
One of my favorite truisms is that our brains are crummy computers floating in a sea of hormones. Our hormones do most of the thinking for some of us.
In any case, it's whatever that produces these overused accelerant hormones that gets exhausted. Probably not our adrenal glands, but that's still a good way to think about it.
So we see that the OP exhibits no overtraining syndrome w/r to heart rate. Quite the opposite in fact. His inability to train normally has caused him to rest more than usual, so now his HR is higher than normal. So not what we think of as overtraining. Therefore, he's either sick or has a dietary problem, which could very well be inadequate protein, or who knows, some other necessary nutrient.
Maybe a visit to the doctor to get a comprehensive blood test? Or experiment with diet - try 25g whey protein 3 X day for a week. Or something else, if you've done something weird with your diet.
OK, overtraining is too adrenal fatigue:
https://courses.lumenlearning.com/bo...ory-functions/
- Epinephrine, produced by the adrenal medulla, causes either smooth muscle relaxation in the airways or contraction of the smooth muscle in arterioles, which results in blood vessel constriction in the kidneys, decreasing or inhibiting blood flow to the nephrons.
- Norepinephrine, produced by the adrenal medulla, is a stress hormone that increases blood pressure, heart rate, and glucose from energy stores; in the kidneys, it will cause constriction of the smooth muscles, resulting in decreased or inhibited flow to the nephrons.