Heart Rate Variability and Body Motion as Digital Biomarkers of Task Workload During Military En Route Critical Care Simulations.

RMSSD showed minimal associations with Motion metrics ( n = 90), with only one weakly significant correlation (Speed Max: ρ = −0.243, β = −0.178, p = 0.019) and six non-significant correlations (all p > 0.05).

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HRV Metrics: All three HRV metrics demonstrated highly significant changes from baseline to simulation ( Table 3 ), with effect sizes ranging from moderate to very large.

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