The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings

Abstract The purpose of the present study was to examine the acute effects of high-intensity jack-knife stretching for 60 s on flexibility of the hamstrings. Twelve healthy participants underwent jack-knife stretching for 60 s (3 repetitions of 20 s stretching with 30 s intervals) at two different i...

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Autores principales:	Kosuke Takeuchi, Kazunori Akizuki, Masatoshi Nakamura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/01c8daa7468747a7bc2e2e6e8a98b0eb
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spelling	oai:doaj.org-article:01c8daa7468747a7bc2e2e6e8a98b0eb2021-12-02T14:59:37ZThe acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings10.1038/s41598-021-91645-x2045-2322https://doaj.org/article/01c8daa7468747a7bc2e2e6e8a98b0eb2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91645-xhttps://doaj.org/toc/2045-2322Abstract The purpose of the present study was to examine the acute effects of high-intensity jack-knife stretching for 60 s on flexibility of the hamstrings. Twelve healthy participants underwent jack-knife stretching for 60 s (3 repetitions of 20 s stretching with 30 s intervals) at two different intensities based on the point of discomfort (POD and PODmax). To examine any change in flexibility, knee extension range of motion (ROM), passive torque at end ROM, and muscle–tendon unit stiffness were measured before and after stretching. To evaluate hamstrings pain, a numerical rating scale (NRS) was described. The knee extension ROM (p < 0.01) and passive torque at end ROM (p < 0.05) were significantly increased at both intensities. The muscle–tendon unit stiffness was significantly decreased in PODmax intensity (p < 0.01), but there was no change in POD intensity (p = 0.18). The median values of NRS during the stretching were 0 and 6–7 in POD and PODmax intensity, respectively, although it was 0 immediately after the stretching protocol in both intensities. These data suggested that high-intensity jack-knife stretching is an effective and safe method to decrease muscle–tendon unit stiffness of the hamstrings.Kosuke TakeuchiKazunori AkizukiMasatoshi NakamuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kosuke Takeuchi Kazunori Akizuki Masatoshi Nakamura The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
description	Abstract The purpose of the present study was to examine the acute effects of high-intensity jack-knife stretching for 60 s on flexibility of the hamstrings. Twelve healthy participants underwent jack-knife stretching for 60 s (3 repetitions of 20 s stretching with 30 s intervals) at two different intensities based on the point of discomfort (POD and PODmax). To examine any change in flexibility, knee extension range of motion (ROM), passive torque at end ROM, and muscle–tendon unit stiffness were measured before and after stretching. To evaluate hamstrings pain, a numerical rating scale (NRS) was described. The knee extension ROM (p < 0.01) and passive torque at end ROM (p < 0.05) were significantly increased at both intensities. The muscle–tendon unit stiffness was significantly decreased in PODmax intensity (p < 0.01), but there was no change in POD intensity (p = 0.18). The median values of NRS during the stretching were 0 and 6–7 in POD and PODmax intensity, respectively, although it was 0 immediately after the stretching protocol in both intensities. These data suggested that high-intensity jack-knife stretching is an effective and safe method to decrease muscle–tendon unit stiffness of the hamstrings.
format	article
author	Kosuke Takeuchi Kazunori Akizuki Masatoshi Nakamura
author_facet	Kosuke Takeuchi Kazunori Akizuki Masatoshi Nakamura
author_sort	Kosuke Takeuchi
title	The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
title_short	The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
title_full	The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
title_fullStr	The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
title_full_unstemmed	The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
title_sort	acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/01c8daa7468747a7bc2e2e6e8a98b0eb
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The acute effects of high-intensity jack-knife stretching on the flexibility of the hamstrings

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