HRV parameters across ‘fatigue’ and ‘no-fatigue’ state: multilevel linear modelling.

The relationships between HR or HRV parameters and the fatigue variable (X variable) were analysed separately: one model for each HR or HRV parameters (Y variables) and each line of the table presents the results of one model. Beta column displays the model parameter and can be seen as the average distance between the values of the ‘fatigue’ and the ‘no-fatigue’ states, as e.g. in ‘fatigue’ recordings supine HR values were on average 6.27 bpm higher and logTP of HRV were on average 0.36 lower than when measured with ‘no-fatigue’ QSFMS score. The variance columns display the within–subject variance of values across the ’no-fatigue’ and ‘fatigue’ state variable (including significance probability).