Track distance runners exhibit bilateral differences in the plantar fascia stiffness

Abstract Human steady-state locomotion modes are symmetrical, leading to symmetric mechanical function of human feet in general; however, track distance running in a counterclockwise direction exposes the runner’s feet to asymmetrical stress. This may induce asymmetrical adaptation in the runners’ f...

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Autores principales:	Hiroto Shiotani, Ryo Yamashita, Tomohiro Mizokuchi, Natsuki Sado, Munekazu Naito, Yasuo Kawakami
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f99081ed70bf4339962fbc604f647d6c
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spelling	oai:doaj.org-article:f99081ed70bf4339962fbc604f647d6c2021-12-02T13:41:34ZTrack distance runners exhibit bilateral differences in the plantar fascia stiffness10.1038/s41598-021-88883-42045-2322https://doaj.org/article/f99081ed70bf4339962fbc604f647d6c2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88883-4https://doaj.org/toc/2045-2322Abstract Human steady-state locomotion modes are symmetrical, leading to symmetric mechanical function of human feet in general; however, track distance running in a counterclockwise direction exposes the runner’s feet to asymmetrical stress. This may induce asymmetrical adaptation in the runners’ foot arch functions, but this has not been experimentally tested. Here, we show that the plantar fascia (PF), a primary structure of the foot arch elasticity, is stiffer for the left than the right foot as a characteristic of runners, via a cross-sectional study on 10 track distance runners and 10 untrained individuals. Shear wave velocity (index of tissue stiffness: SWV) and thickness of PF and foot dimensions were compared between sides and groups. Runners showed higher PF SWV in their left (9.4 ± 1.0 m/s) than right (8.9 ± 0.9 m/s) feet, whereas untrained individuals showed no bilateral differences (8.5 ± 1.5 m/s and 8.6 ± 1.7 m/s, respectively). Additionally, runners showed higher left to right (L/R) ratio of PF SWV than untrained men (105.1% and 97.7%, respectively). PF thickness and foot dimensions were not significantly different between sides or groups. These results demonstrate stiffer PF in the left feet of runners, which may reflect adaptation to their running-specific training that involves asymmetrical mechanical loading.Hiroto ShiotaniRyo YamashitaTomohiro MizokuchiNatsuki SadoMunekazu NaitoYasuo KawakamiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hiroto Shiotani Ryo Yamashita Tomohiro Mizokuchi Natsuki Sado Munekazu Naito Yasuo Kawakami Track distance runners exhibit bilateral differences in the plantar fascia stiffness
description	Abstract Human steady-state locomotion modes are symmetrical, leading to symmetric mechanical function of human feet in general; however, track distance running in a counterclockwise direction exposes the runner’s feet to asymmetrical stress. This may induce asymmetrical adaptation in the runners’ foot arch functions, but this has not been experimentally tested. Here, we show that the plantar fascia (PF), a primary structure of the foot arch elasticity, is stiffer for the left than the right foot as a characteristic of runners, via a cross-sectional study on 10 track distance runners and 10 untrained individuals. Shear wave velocity (index of tissue stiffness: SWV) and thickness of PF and foot dimensions were compared between sides and groups. Runners showed higher PF SWV in their left (9.4 ± 1.0 m/s) than right (8.9 ± 0.9 m/s) feet, whereas untrained individuals showed no bilateral differences (8.5 ± 1.5 m/s and 8.6 ± 1.7 m/s, respectively). Additionally, runners showed higher left to right (L/R) ratio of PF SWV than untrained men (105.1% and 97.7%, respectively). PF thickness and foot dimensions were not significantly different between sides or groups. These results demonstrate stiffer PF in the left feet of runners, which may reflect adaptation to their running-specific training that involves asymmetrical mechanical loading.
format	article
author	Hiroto Shiotani Ryo Yamashita Tomohiro Mizokuchi Natsuki Sado Munekazu Naito Yasuo Kawakami
author_facet	Hiroto Shiotani Ryo Yamashita Tomohiro Mizokuchi Natsuki Sado Munekazu Naito Yasuo Kawakami
author_sort	Hiroto Shiotani
title	Track distance runners exhibit bilateral differences in the plantar fascia stiffness
title_short	Track distance runners exhibit bilateral differences in the plantar fascia stiffness
title_full	Track distance runners exhibit bilateral differences in the plantar fascia stiffness
title_fullStr	Track distance runners exhibit bilateral differences in the plantar fascia stiffness
title_full_unstemmed	Track distance runners exhibit bilateral differences in the plantar fascia stiffness
title_sort	track distance runners exhibit bilateral differences in the plantar fascia stiffness
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f99081ed70bf4339962fbc604f647d6c
work_keys_str_mv	AT hirotoshiotani trackdistancerunnersexhibitbilateraldifferencesintheplantarfasciastiffness AT ryoyamashita trackdistancerunnersexhibitbilateraldifferencesintheplantarfasciastiffness AT tomohiromizokuchi trackdistancerunnersexhibitbilateraldifferencesintheplantarfasciastiffness AT natsukisado trackdistancerunnersexhibitbilateraldifferencesintheplantarfasciastiffness AT munekazunaito trackdistancerunnersexhibitbilateraldifferencesintheplantarfasciastiffness AT yasuokawakami trackdistancerunnersexhibitbilateraldifferencesintheplantarfasciastiffness
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Track distance runners exhibit bilateral differences in the plantar fascia stiffness

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