To start with there are 2 regulatory mechanisms of the body, the autonomic nervous system (ans) and the neuro endocrine system (nes). The ans is then broken down further into the parasympathetic nervous system (pns) and the sympathetic nervous system (sns). Both of these are part of the fight or flight equation:
PNS - Flight
SNS - Fight
The ANS is stimulated when the brain senses any form of challenge and once it is activated, it stimulates the output of cortisol, a stress fighting but fat storing hormone. Adrenaline is also increased which keeps us alert by increasing heart rate and blood pressure by quickly mobilising energy reserves, while cortisol works more slowly to help replenish energy supplies.
All of these adaptive changes is called allostasis which refers to maintaining stability, or homeostasis, through change.
I bet we've all played with the bloke who has a bit of white line fever and gets quite ramped up during games - this is from him being in a very sympathetic state which for competition, is actually essential.
On the flip side we've all played with that bloke who looks like he's barely awake who pretty much stays in a parasympathetic state regardless of the "challenge'.
The biggest trick though is to be able to interchange through both the parasympathetic and sympathetic nervous systems.
So you're on the ground and going like a bat of hell (how bad was Meatloaf that time?) and you blow up and it's time to head to the bench to recover. In order for you to recover in as fast a time as possible you need to swiftly move into a parasympathetic state to slow your rate down and to start shifting your body back to homeostasis (normal).
Thinking long term, training with high volumes and intensities means you enter a sympathetic dominant state very often which is fine, but during this time when you feel a bit rundown, have trouble sleeping and have a lack of appetite compared to normal, then you're getting stuck in the SNS and not shifting back to the PNS. This means that you're not really recovering enough and sooner rather them later, you're body might make you take a break through illness, or even injury.
Taking heart rare variability is something you do everyday to get a gauge at how your body is tracking against your playing stress, training stress and outside stressors because they all add up. Once you overflow the "stress" cup, it can take a while to get rid of this excess build up. This means that relationships, food quality and alcohol can also have a big effect on your readings.
I have recently started using an app called HRV4Training for my own heart rate variability. There are others on market such as bioforce and iathlete that are the go-to app's for this but they require a compatible heart rate monitor and mine is non-compatible.
HRV4Training provides a lot of funky readings but the ones I look at is the day's reading, how it compared to yesterday and also how it compares to my baseline. I also keep track of resting heart rate and rMSSD reading too which the creator told me is the equivalent of a HRV reading from the other app's. The app does this in 1 single 60sec measurement that you'd take immediately upon waking. I do it while I'm actually still in bed!
The home screen tells you your assessment today, yesterday's assessment and you're baseline based on the last 7 days.
It provides with 1 of 3 tips to program your training for the day.
#1 - Your condition has improved since yesterday and is above baseline so go hard today
#2 - Your condition has worsened since yesterday and its below baseline so take it easy today
#3 - Your condition has worsened for 2 days in a row so take today off.
So the app takes your daily reading then tells you what you should do with your training today. In the above image you can see that I registered 7.9 which was lower then the day before and also lower then my baseline so it suggests I take it easy today. So instead of doing that hard repeat sprint session I had planned, I would opt for a recovery based session today so hopefully I improve for tomorrow and can go hard then.
Now you don't have to live your life by what it tells you to do, it might be game day where it says to take a day off, but what you can do there is go back to your monitoring and rate of perceived exertion tables and find correlations between your scores and your 'low' days which should be able to help you alter your training and lifestyle accordingly.
UPDATE - I have read many times that you should never go against the HRV reading and yesterday was the proof in the pudding. At the moment I've just started a depth jumping cycle which requires pretty much stresses the nervous system more then anything of which I started last week. I was coming off a day off and 2 full days since my last depth jumping session so I "should" have been rested and ready to go. I did nothing on the weekend or new years eve so there was no reason to not get a good HRV score come Monday.
My test gave me a reading of 7.4 against the previous days 8.4 against my baseline of 7.9 which said take a day off training but being as it's the off season then I can train and make up the rest later if I need to.
About 3/4's of the way through my workout which was feeling fine, I felt a 1% twinge in the lower back between sets. Something I've probably felt a million times before without repercussion. Except this time! Language Warning!!
I did my 9th set of power cleans and the back went which it does probably once a year in the 1st part of the year when my training load is at it's highest but I was determined not to do it this year...and failed miserably.
The lesson is to not go against the HRV reading so if it says take it easy then limit any activities that have a history with making you sore, run down or injured.
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