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Roles of Physiological Responses and Anthropometric Factors on the Gravitational Force Tolerance for Occupational Hypergravity Exposure

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  • 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 County 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)

  • Hsin Chu

    (Civil Aviation Medical Center, Taipei City 105, Taiwan
    Graduate Institute of Aerospace and Undersea Medicine, National Defense Medical Center, Taipei City 114, Taiwan)

  • Hsin-Hui Chen

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

  • Kwo-Tsao Chiang

    (Aviation Physiology Research Laboratory, Kaohsiung Armed Forces General Hospital Gangshan Branch, Kaohsiung City 820, Taiwan
    Institute of Medical Science and Technology, National Sun Yat-sen University, Kaohsiung City 804, Taiwan)

  • Je-Ming Hu

    (Division of Colorectal Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei City 114, Taiwan
    Graduate Institute of Medical 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)

  • Chen-Shu Yang

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

  • Chao-Chien Cheng

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

  • Chung-Yu Lai

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

Abstract

Gravity in the head-to-toe direction, known as +Gz (G force), forces blood to pool in the lower body. Fighter pilots experience decreases in blood pressure when exposed to hypergravity in flight. Human centrifuge has been used to examine the G tolerance and anti-G straining maneuver (AGSM) techniques of military pilots. Some factors that may affect G tolerance have been reported but are still debated. The aim of this study was to investigate the physiological responses and anthropometric factors correlated with G tolerance. We retrospectively reviewed the training records of student pilots who underwent high G training. Variables were collected to examine their correlations with the outcome of 7.5G sustained for 15 s (7.5G profile). There were 873 trainees who underwent 7.5G profile training, 44 trainees (5.04%) could not sustain the test for 15 s. The group with a small heart rate (HR) increase (less than 10%) during the first 1–5 s of the 7.5G profile had a nearly ten-fold higher failing chance compared with the large HR increase group (adjusted odds ratio: 9.91; 95% confidence interval: 4.11–23.88). The chances of failure were inversely related to the HR increase percentage ( p for trend <0.001). Factors, including body mass index, relaxed and straining G tolerance, and AGSM, were found to be negatively correlated with the outcome.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:21:p:8061-:d:438710
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    Cited by:

    1. 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.

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