Relationship between the G Tolerance, Physical Performance, and Cardiac Force Index in Male Aircrew: A Prospective...

Area of Science:

• Aerospace Medicine
• Human Performance
• Cardiovascular Physiology

Background:

• G tolerance is critical for aircrew safety and performance.
• Understanding factors influencing G tolerance can optimize training and reduce risks.
• Previous research has explored various physiological and physical predictors, but the combined role of cardiac function and dynamic physical performance requires further investigation.

Purpose of the Study:

• To investigate the correlation between G tolerance and physical performance metrics in male aircrew cadets.
• To determine the relationship between cardiac force index (CFI) and G tolerance.
• To identify potential predictors for classifying cadets into high or low G tolerance groups.

Main Methods:

• Collected demographic and exercise data from 82 male military flight cadets.
• Monitored cardiac data, including walking CFI (WCFI), using BioPatch™ HP devices.
• Assessed physical performance through 100-meter sprint tests and jump performance tests (peak power, normalized peak power, jump height).
• Evaluated G tolerance using gradual onset rate for relaxed G tolerance (RGT) and straining G tolerance (SGT).
• Employed logistic regression to analyze correlations between G tolerance, physical performance, and CFI.

Main Results:

• Identified 53 trainees in the low G tolerance group and 29 in the high G tolerance group.
• The high G tolerance group exhibited significantly shorter sprint times (14.1 ± 1.0s) compared to the low G tolerance group (14.4 ± 1.1s).
• A higher WCFI (>0.15) was strongly associated with enhanced G tolerance (aOR: 3.72).
• Shorter sprint completion times were negatively associated with G tolerance (aOR: 0.38).

Conclusions:

• Higher WCFI and faster sprint times are significant positive predictors of G tolerance in male aircrew cadets.
• These findings suggest that integrating sprint and jump tests with cardiovascular monitoring can aid in stratifying cadets based on G tolerance.
• Personalized training regimens can be developed for aircrew based on these objective performance and physiological assessments.