If you are suffering with a chronic injury or pain lack of sleep may be the hidden piece of your recovery puzzle.
Lack of sleep leads to increased inflammation, increased pain and slowed healing – all of which are obviously disastrous when it comes to recovering from injury. Lets look at each in a little more detail…
“Sleep is necessary, if not essential, for recovery from pain and disability”
Okifuji, A
The tissues of the body are continuously broken down and rebuilt / renewed. Sleep is critical for healing as it shifts the balance in favour of building and renewal. In fact, when tissues have been damaged, the rate of healing is greatest during sleep, whatever time of day the injury occurred [2].
Lack of sleep not only slows recovery but also increases injury risk in the first place. Adolescent athletes who sleep less than 8 hours per night (on average) were found to have 1.7 times greater risk of injury than those who sleep more than 8 hours [3].
This increased to over double the risk (2.3) when shorter sleep was coupled with an increased training intensity and volume [4]
And this makes perfect sense. If you are training hard (and breaking down your muscles, tendons, ligaments etc) but you are not sleeping adequately to allow them to recover its logical that the outcome will be injury. The same goes for recovery after injury. If you are not sleeping enough for the injured tissue to rebuild, recovery will be slow or non-existent.
Not only does lack of sleep slow recovery but it also effects the pain we feel.
Sleep disruption has been found to reduce pressure pain thresholds by 24% the next day. Unsurprisingly, improved sleep has been shown to reduce pain. [5]
“Sleep appears to be a natural analgesic.”
Matthew Walker
There are many different mechanisms at play but 2 key ones are sleeps effect on hormonal release and inflammation.
Sleep deprivation or restriction leads to a decrease in the “renewal” hormones (e.g. testosterone and growth factor) whilst increasing the “breakdown” hormones (e.g. glucocorticoids). [6]
Lack of sleep also promotes chronic inflammation. Chronic or systemic inflammation is the “persistent inflammatory state which promotes ongoing tissue damage”. [7,8]
This chronic and widespread inflammation is linked with a host of chronic diseases including diabetes, cancer and cardiovascular disease but also muscle and joint problems such as disc herniation, arthritis and tendonitis. [9] And the level of sleep deprivation doesn’t have to be severe to start having an effect. For most people, not getting at least 6 hours of sleep over a 24-hour period can cause out cells to release thesame inflammatory chemicals that are released during infection or trauma. [10]
‘Pain, Injury, Recovery and Sleep’ was written by Steffen Toates. Steffen is a chiropractor at Dynamic Health Chiropractic in Jersey CI. For more information about Steffen click here.
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