Period during light pulses (‘intervention’)
We did not observe a significant interaction or main effect of test cycle in the reaction speed of aPVT, aPVT reaction speed, RMSSD, and pre-/post aPVT sleepiness-alertness ratings (VAS). Note: the figure shows means and 95% confidence intervals of the means.Similar results were found for the HRV-parameter RMSSD in the period ‘intervention’ of the aPVT. We observed a significant main effect of light intervention (