Key result
Nonstationarity of cardiac interval time series did not influence the assessment of the functional state of operator personnel, allowing reliable assessments from short samples of 32 to 256 RR intervals.
Observational
Reliable functional state assessments using HRV can be obtained from short ECG samples (down to 32 RR intervals) despite nonstationarity.
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Short RR samples may enable reliable operator functional assessments via HRV; leaves open prospective validation before broader use.
V. A. Mashin (2007) conducted an observational in Functional state of operator personnel. Nonstationarity and duration of cardiac interval time series was evaluated on Assessment of functional state using a three-factor model of heart rhythm variability. Nonstationarity of cardiac interval time series did not influence the assessment of the functional state of operator personnel, allowing reliable assessments from short samples of 32 to 256 RR intervals.
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