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A Cardiac Force Index Applied to the G Tolerance Test and Surveillance among Male Military Aircrew

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  • Kwo-Tsao Chiang

    (Aviation Physiology Research Laboratory, Kaohsiung Armed Forces General Hospital Gangshan Branch, Kaohsiung City 820, Taiwan
    School of Public Health, National Defense Medical Center, Taipei City 114, Taiwan)

  • Min-Yu Tu

    (Aviation Physiology Research Laboratory, Kaohsiung Armed Forces General Hospital Gangshan Branch, Kaohsiung City 820, Taiwan
    Department of Health Business Administration, Meiho University, Pingtung City 912, Taiwan
    Department of Life Sciences and PhD Program in Translational Medicine, National Chung Hsing University, Taichung City 402, Taiwan
    Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung City 804, Taiwan)

  • You-Jin Lin

    (Graduate Institute of Aerospace and Undersea Medicine, National Defense Medical Center, Taipei City 114, Taiwan)

  • Yi-Hsiang Hsin

    (Aviation Physiology Research Laboratory, Kaohsiung Armed Forces General Hospital Gangshan Branch, Kaohsiung City 820, Taiwan)

  • Yu-Lung Chiu

    (School of Public Health, National Defense Medical Center, Taipei City 114, Taiwan
    Graduate Institute of Life Sciences, National Defense Medical Center, Taipei City 114, Taiwan)

  • Fang-Ling Li

    (Department of Psychiatry, Tri-Service General Hospital Beitou Branch, National Defense Medical Center, Taipei City 114, Taiwan)

  • Hsin-Hui Chen

    (Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei City 114, Taiwan)

  • Chung-Yu Lai

    (Graduate Institute of Aerospace and Undersea Medicine, National Defense Medical Center, Taipei City 114, Taiwan)

Abstract

Military aircrew are occupationally exposed to a high-G environment. A tolerance test and surveillance is necessary for military aircrew before flight training. A cardiac force index (CFI) has been developed to assess long-distance running by health technology. We added the parameter CFI to the G tolerance test and elucidated the relationship between the CFI and G tolerance. A noninvasive device, BioHarness 3.0, was used to measure heart rate (HR) and activity while resting and walking on the ground. The formula for calculating cardiac function was CFI = weight × activity/HR. Cardiac force ratio (CFR) was calculated by walking CFI (WCFI)/resting CFI (RCFI). G tolerance included relaxed G tolerance (RGT) and straining G tolerance (SGT) tested in the centrifuge. 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. Each 100-unit increase in the WCFI increased the RGT by 0.14 G and the SGT by 0.17 G. There was an increased chance of RGT values higher than 5 G and SGT values higher than 8 G according to the WCFI increase. 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.

Suggested Citation

  • Kwo-Tsao Chiang & Min-Yu Tu & You-Jin Lin & Yi-Hsiang Hsin & Yu-Lung Chiu & Fang-Ling Li & Hsin-Hui Chen & Chung-Yu Lai, 2021. "A Cardiac Force Index Applied to the G Tolerance Test and Surveillance among Male Military Aircrew," IJERPH, MDPI, vol. 18(16), pages 1-12, August.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:16:p:8832-:d:619063
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    References listed on IDEAS

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    1. Olivier Manen & Caroline Dussault & Fabien Sauvet & Stéphanie Montmerle-Borgdorff, 2015. "Limitations of Stroke Volume Estimation by Non-Invasive Blood Pressure Monitoring in Hypergravity," PLOS ONE, Public Library of Science, vol. 10(3), pages 1-13, March.
    2. Min-Yu Tu & Hsin Chu & Hsin-Hui Chen & Kwo-Tsao Chiang & Je-Ming Hu & Fang-Ling Li & Chen-Shu Yang & Chao-Chien Cheng & Chung-Yu Lai, 2020. "Roles of Physiological Responses and Anthropometric Factors on the Gravitational Force Tolerance for Occupational Hypergravity Exposure," IJERPH, MDPI, vol. 17(21), pages 1-10, November.
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