Key result
Flight training elicits divergent autonomic responses, with ~45% of trainees showing sympathetic activation.
Why the study?
The study aimed to elucidate autonomic regulation by investigating correlations between RR intervals and spectral bands of HRV during flight training in student pilots.
Do flight operations alter heart rate variability and autonomic nervous system balance in student pilots?
Observational (n=21)
No
Do flight operations alter heart rate variability and autonomic nervous system balance in student pilots?
During flight training, student pilots exhibit varying autonomic nervous system responses, with a demand for increased cardiac output characterized by sympathetic activation and decreased RR intervals in high performers.
Variable autonomic responses during flight training associate with performance; hypothesis-generating for HRV monitoring in aviation but should not change practice.
Spectral analysis techniques are employed to evaluate electrocardiographic signals. The high-frequency (HF) and low-frequency (LF) components of the tachogram reflect autonomic nervous system modulation of heart rate variability (HRV). This study investigated the correlations between successive heartbeats (RR intervals) and these spectral bands to further elucidate autonomic regulation. Student pilots were monitored with Holter electrocardiograms during training missions. Data were analyzed across three phases: 1) before flight operations on ground (bfo), 2) during flight operations (dfo), and 3) after flight operations on ground. RR interval analysis identified three trends during dfo compared to bfo: a decrease (45,1% of students), no change (15,7%), and an increase (39,2%). These patterns were associated with alterations in the correlation indices for LF and HF power. Students demonstrating superior performance (D-Students) exhibited the strongest positive correlation coefficient between RR intervals and LF/HF band power (+58,3%). A similar trend was observed for the correlation between LF and HF power in this group (+2,9%). The findings suggest that a demand for increased cardiac output, typified by decreased RR intervals, is primarily driven by sympathetic activation. A different autonomic state is observed when the heart is already engaged at the onset of a performance challenge. Notably, some individuals establish a new autonomic balance at the start of a demanding task, characterized by increased total spectral power and elevated HRV, indicative of an optimized autonomic state under high-load conditions.
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Volsi et al. (2026) conducted an observational in Healthy student pilots (n=21). Flight training operations vs. Ground operations before flight was evaluated on Change in RR intervals and spectral bands (LF and HF) during flight operations compared to pre-flight ground operations. Flight training operations elicited distinct autonomic responses, with 45.1% of students showing decreased RR intervals indicative of sympathetic activation, while 39.2% established a new autonomic balance with increased RR intervals under high load.
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