Impact of yoga training on heart rate variability and pilot performance: a randomized controlled trial

Background: Piloting military aircraft demands precise execution of maneuvers under high-stress conditions. Yoga has been proposed as a potential intervention to enhance stress management, operational performance, and flight safety in pilots. However, its effects on stress resilience and performance metrics need further investigation. Methods: In this randomized controlled trial, 18 pilots were randomly assigned to either a Yoga intervention group (n = 10) or a control group (n = 8). Heart rate variability (HRV) measures were analyzed to evaluate physiological stress responses. Performance variables, including completion times for flight maneuvers and number of errors during emergency protocol, were also assessed before and after a 12-week intervention period. Results: HRV analysis showed improvements in stress resilience, indicated by changes in heart rate variability (HRV) parameters such as standard deviation of NN intervals (SDNN), root mean square of successive differences (RMSSD), low frequency (LF), and high frequency (HF). The Wilcoxon rank test revealed significant results regarding performance variables within the Yoga group, particularly for the Touch & Go maneuver (p = 0.016) and the emergency maneuver (p = 0.039), with large effect sizes (0.9444 and 0.8333, respectively). While completion times were longer for the Yoga group, indicating a more careful approach, the number of errors significantly decreased (p = 0.025, effect size = 0.917), with a notable reduction observed in the Yoga group compared to controls. Conclusion: Incorporating yoga into pilot training protocols holds promise for better executive/cognitive functions, enhancing stress management and operational performance, reducing the number of errors, and leading to increased flight safety. While yoga may lead to longer completion times for maneuvers, the significant reduction in errors and improvements in stress resilience highlight its potential benefits. However, careful consideration is needed to balance improved precision with operational efficiency.