Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge

Abstract Increased heart rate (HR) is a reaction to head-to-toe gravito-inertial (G) force. The anti-G straining manoeuvre (AGSM) is the crucial technique for withstanding a high-G load. Previous studies reported the main effects of HR only or AGSM only on G tolerance. We assessed the combined effec...

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Autores principales:	Min-Yu Tu, Hsin Chu, You-Jin Lin, Kwo-Tsao Chiang, Chuan-Mu Chen, Hsin-Hui Chen, Chen-Shu Yang, Chung-Yu Lai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/adabbe1246624c2e8370472d8aaf52e8
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spelling	oai:doaj.org-article:adabbe1246624c2e8370472d8aaf52e82021-12-02T11:43:58ZCombined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge10.1038/s41598-020-78687-32045-2322https://doaj.org/article/adabbe1246624c2e8370472d8aaf52e82020-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-78687-3https://doaj.org/toc/2045-2322Abstract Increased heart rate (HR) is a reaction to head-to-toe gravito-inertial (G) force. The anti-G straining manoeuvre (AGSM) is the crucial technique for withstanding a high-G load. Previous studies reported the main effects of HR only or AGSM only on G tolerance. We assessed the combined effect of HR and AGSM on the outcome of 9G profile exposure. A total of 530 attempts for the 9G profile were extracted to clarify the association of interest. Subjects with an AGSM effectiveness of less than 2.5G had a 2.14-fold higher likelihood of failing in the 9G profile. Trainees with HR increases of less than 20% in the first five seconds also had higher odds of 9G profile intolerance (adjusted OR 1.83, 95% CI 1.09–3.07). The adjusted OR of 9G profile disqualification was 2.93 (95% CI 1.19–7.20) for participants with smaller HR increases and lower AGSM effectiveness. The negative effect of a smaller HR increase on the outcome was likely to be affected by improved AGSM effectiveness (adjusted OR 1.26, 95% CI 0.65–2.42). We speculate that low AGSM effectiveness and a small HR increase were separately associated with failure of high-G challenge. Nonetheless, good AGSM performance seemed to reduce the negative effect of weak HR responses on the dependent variable.Min-Yu TuHsin ChuYou-Jin LinKwo-Tsao ChiangChuan-Mu ChenHsin-Hui ChenChen-Shu YangChung-Yu LaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Min-Yu Tu Hsin Chu You-Jin Lin Kwo-Tsao Chiang Chuan-Mu Chen Hsin-Hui Chen Chen-Shu Yang Chung-Yu Lai Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge
description	Abstract Increased heart rate (HR) is a reaction to head-to-toe gravito-inertial (G) force. The anti-G straining manoeuvre (AGSM) is the crucial technique for withstanding a high-G load. Previous studies reported the main effects of HR only or AGSM only on G tolerance. We assessed the combined effect of HR and AGSM on the outcome of 9G profile exposure. A total of 530 attempts for the 9G profile were extracted to clarify the association of interest. Subjects with an AGSM effectiveness of less than 2.5G had a 2.14-fold higher likelihood of failing in the 9G profile. Trainees with HR increases of less than 20% in the first five seconds also had higher odds of 9G profile intolerance (adjusted OR 1.83, 95% CI 1.09–3.07). The adjusted OR of 9G profile disqualification was 2.93 (95% CI 1.19–7.20) for participants with smaller HR increases and lower AGSM effectiveness. The negative effect of a smaller HR increase on the outcome was likely to be affected by improved AGSM effectiveness (adjusted OR 1.26, 95% CI 0.65–2.42). We speculate that low AGSM effectiveness and a small HR increase were separately associated with failure of high-G challenge. Nonetheless, good AGSM performance seemed to reduce the negative effect of weak HR responses on the dependent variable.
format	article
author	Min-Yu Tu Hsin Chu You-Jin Lin Kwo-Tsao Chiang Chuan-Mu Chen Hsin-Hui Chen Chen-Shu Yang Chung-Yu Lai
author_facet	Min-Yu Tu Hsin Chu You-Jin Lin Kwo-Tsao Chiang Chuan-Mu Chen Hsin-Hui Chen Chen-Shu Yang Chung-Yu Lai
author_sort	Min-Yu Tu
title	Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge
title_short	Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge
title_full	Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge
title_fullStr	Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge
title_full_unstemmed	Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge
title_sort	combined effect of heart rate responses and the anti-g straining manoeuvre effectiveness on g tolerance in a human centrifuge
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/adabbe1246624c2e8370472d8aaf52e8
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Combined effect of heart rate responses and the anti-G straining manoeuvre effectiveness on G tolerance in a human centrifuge

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