![]() The main purposes of this study were to examine the association between cardiac function on the ground and G tolerance in the centrifuge and to further identify the difference in cardiac function between the different G tolerance groups. The aforementioned cardiac function variable CFI was added to the G tolerance test for the first time. We attempted to introduce the parameter CFI into the G tolerance assessment to address this concerning occupational safety issue. As stated above, we therefore presumed that CFI might also be connected to G tolerance during the centrifuge training. In addition, our former findings identified that there is an inverse relationship between the G tolerance and HR on the ground. From the literature review, we also summarized that weight is positively correlated with G tolerance. successfully applied a novel cardiac force index (CFI), which is calculated from the weight multiplying activity divided by HR and positively correlated to running performance. To date, there is no integrated cardiac function indicator that can be used to assess G tolerance on the ground before centrifuge training. In addition, the signal quality of those cardiovascular parameters was not good enough to be analyzed during a period of physical exertion or in high-G environment due to the limitations of the physiological monitoring machine. As those factors are certainly correlated with each other, it is difficult to consolidate them into a simple one during practical training. Ī number of reports have been conducted to investigate the relationship between G tolerance and cardiovascular index responses, such as heart rate (HR), mean arterial pressure, stroke volume, cardiac output, and total peripheral resistance. AGSM execution also simultaneously enhances cardiovascular performance under G load. Activation of the cardiovascular system plays a crucial role in the tolerance of G force. Trainees can experience physiological impacts and perform an effective anti-G straining maneuver (AGSM) against GLOC. A tolerance test and surveillance in the human centrifuge is a prerequisite for military aircrew in many countries. If G stress surpasses the tolerance, military aircrew will probably experience visual disturbances and even G-induced loss of consciousness (GLOC) that will extremely threaten the flight safety. Hydrostatic pressure produced by G force causes blood to flow toward the lower body region, and hemodynamic parameters are affected in hypergravity environments. Levels of downward inertial force can be quantified as gravity (+Gz, also called G force). Military aircrew are occupationally subjected to six axes of acceleration in flight. Results suggested that WCFI is positively correlated with G tolerance and has the potential for G tolerance surveillance and programs of G tolerance improvement among male military aircrew. There was an increased chance of RGT values higher than 5 G and SGT values higher than 8 G according to the WCFI increase. Each 100-unit increase in the WCFI increased the RGT by 0.14 G and the SGT by 0.17 G. Among 92 male participants, the average of RCFI, WCFI, and CFR were 0.02 ± 0.04, 0.15 ± 0.04, and 10.77 ± 4.11, respectively. G tolerance included relaxed G tolerance (RGT) and straining G tolerance (SGT) tested in the centrifuge. Cardiac force ratio (CFR) was calculated by walking CFI (WCFI)/resting CFI (RCFI). The formula for calculating cardiac function was CFI = weight × activity/HR. ![]() A noninvasive device, BioHarness 3.0, was used to measure heart rate (HR) and activity while resting and walking on the ground. ![]() ![]() ![]() We added the parameter CFI to the G tolerance test and elucidated the relationship between the CFI and G tolerance. A cardiac force index (CFI) has been developed to assess long-distance running by health technology. A tolerance test and surveillance is necessary for military aircrew before flight training. Military aircrew are occupationally exposed to a high-G environment. ![]()
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