New link between sleep and concussion identified by researchers flinders
During the acute post-SRC phase, participants reported a median of 11 symptoms , with a median score of 21 . During the subacute post-SRC phase, participants reported a median of four symptoms , with a median overall symptom score of 5 .Sleep data for both the acute and subacute phases of SRC, as well as the normative data, are presented in
. No EEG data was lost for any participant; however, one participant lost electrocardiograph measures, whilst another lost pulse oximetry, both on subacute nights.When comparing the acute sleep metrics to the normative data, the t-tests indicated that those with SRC experienced significantly longer total sleep time , significantly fewer arousals , and significantly longer REM latency . Further, there was a trend towards significantly increased percent of the total sleep spent in Stage N3 sleep .
When comparing the subacute sleep metrics to the normative data, the t-tests indicated those with SRC experienced significantly longer total sleep time , reduced percent of the total sleep time spend in Stage N1 sleep , increased percent of the total sleep spent in Stage N3 sleep , increased sleep efficiency , fewer arousals , shorter sleep onset latency , and reduced wake after sleep onset . No other significant differences were shown.
Methodologically, our study aligned closely with Roa et al’s study measuring sleep acutely within a week after concussion, but showed conflicting results.Rao et al showed no difference in any sleep metric between those with concussion and controls who did not have concussion.
We speculate that longer and less disrupted sleep during both phases of SRC, when compared to normative values, and improvements in sleep from acute to subacute phases of SRC, is an attempt by the brain to minimise and repair the damage resulting from SRC. The significantly increased proportion of Stage N3 sleep during the subacute phase is potentially important.
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