Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities

Abstract The current study investigated body roll amplitude and timing of its peak in backstroke and compared them with front crawl swimming. Nineteen anatomical landmarks were digitised using 80 swimming trial videos (ten swimmers × two techniques × four intensities) recorded by two above- and four...

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Autores principales:	Tomohiro Gonjo, Ricardo J. Fernandes, João Paulo Vilas-Boas, Ross Sanders
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d0ab11cd0abd4052b3ec191c7e800c2b
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spelling	oai:doaj.org-article:d0ab11cd0abd4052b3ec191c7e800c2b2021-12-02T14:12:45ZBody roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities10.1038/s41598-020-80711-52045-2322https://doaj.org/article/d0ab11cd0abd4052b3ec191c7e800c2b2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80711-5https://doaj.org/toc/2045-2322Abstract The current study investigated body roll amplitude and timing of its peak in backstroke and compared them with front crawl swimming. Nineteen anatomical landmarks were digitised using 80 swimming trial videos (ten swimmers × two techniques × four intensities) recorded by two above- and four below-water cameras. One upper-limb cycle was analysed for each trial, and shoulder and hip roll, whole-body roll (WBR), and WBR due to the buoyant torque (WBR BT ) were obtained. Main effects of intensity and technique on the amplitude and timing to reach the peak in those variables were assessed by two-way repeated-measures ANOVA. Swimmers decreased their WBR BT amplitude with an increase in the intensity in both techniques (p ≤ 0.005). The same result was observed for the amplitude of WBR, shoulder roll, and hip roll only in front crawl (p ≤ 0.017). Swimmers maintained the timing of peak WBR BT in both techniques, while they shifted the timing of WBR and hip roll peak toward the beginning of the cycle when increasing the intensity in front crawl (p ≤ 0.017). In conclusion, swimmers maintain the amplitude of WBR, shoulder roll, and hip roll in backstroke when the intensity increases, whereas they reduce the amplitude of all rolls in front crawl.Tomohiro GonjoRicardo J. FernandesJoão Paulo Vilas-BoasRoss SandersNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tomohiro Gonjo Ricardo J. Fernandes João Paulo Vilas-Boas Ross Sanders Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
description	Abstract The current study investigated body roll amplitude and timing of its peak in backstroke and compared them with front crawl swimming. Nineteen anatomical landmarks were digitised using 80 swimming trial videos (ten swimmers × two techniques × four intensities) recorded by two above- and four below-water cameras. One upper-limb cycle was analysed for each trial, and shoulder and hip roll, whole-body roll (WBR), and WBR due to the buoyant torque (WBR BT ) were obtained. Main effects of intensity and technique on the amplitude and timing to reach the peak in those variables were assessed by two-way repeated-measures ANOVA. Swimmers decreased their WBR BT amplitude with an increase in the intensity in both techniques (p ≤ 0.005). The same result was observed for the amplitude of WBR, shoulder roll, and hip roll only in front crawl (p ≤ 0.017). Swimmers maintained the timing of peak WBR BT in both techniques, while they shifted the timing of WBR and hip roll peak toward the beginning of the cycle when increasing the intensity in front crawl (p ≤ 0.017). In conclusion, swimmers maintain the amplitude of WBR, shoulder roll, and hip roll in backstroke when the intensity increases, whereas they reduce the amplitude of all rolls in front crawl.
format	article
author	Tomohiro Gonjo Ricardo J. Fernandes João Paulo Vilas-Boas Ross Sanders
author_facet	Tomohiro Gonjo Ricardo J. Fernandes João Paulo Vilas-Boas Ross Sanders
author_sort	Tomohiro Gonjo
title	Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
title_short	Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
title_full	Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
title_fullStr	Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
title_full_unstemmed	Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
title_sort	body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d0ab11cd0abd4052b3ec191c7e800c2b
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Body roll amplitude and timing in backstroke swimming and their differences from front crawl at the same swimming intensities

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