Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance

Passive muscle stiffness is positively associated with explosive performance. Drop jump training may be a strategy to increase passive muscle stiffness in the lower limb muscles. Therefore, the purpose of this study was to examine the effect of 8-week drop jump training on the passive stiffness in t...

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Autores principales:	Ryosuke Ando, Shinya Sato, Naoya Hirata, Hiroki Tanimoto, Naoto Imaizumi, Yasuhiro Suzuki, Kosuke Hirata, Ryota Akagi
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	passive muscle stiffness gastrocnemius soleus rate of torque development drop jump elastography Physiology QP1-981
Acceso en línea:	https://doaj.org/article/31b7cc06886c4a249fa10b0c0aee8344
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spelling	oai:doaj.org-article:31b7cc06886c4a249fa10b0c0aee83442021-11-18T09:23:51ZRelationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance1664-042X10.3389/fphys.2021.777268https://doaj.org/article/31b7cc06886c4a249fa10b0c0aee83442021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fphys.2021.777268/fullhttps://doaj.org/toc/1664-042XPassive muscle stiffness is positively associated with explosive performance. Drop jump training may be a strategy to increase passive muscle stiffness in the lower limb muscles. Therefore, the purpose of this study was to examine the effect of 8-week drop jump training on the passive stiffness in the plantar flexor muscles and the association between training-induced changes in passive muscle stiffness and explosive performance. This study was a randomized controlled trial. Twenty-four healthy young men were divided into two groups, control and training. The participants in the training group performed drop jumps (five sets of 20 repetitions each) 3days per week for 8weeks. As an index of passive muscle stiffness, the shear moduli of the medial gastrocnemius and soleus were measured by shear wave elastography before and after the intervention. The participants performed maximal voluntary isometric plantar flexion at an ankle joint angle of 0° and maximal drop jumps from a 15cm high box. The rate of torque development during isometric contraction was calculated. The shear modulus of the medial gastrocnemius decreased for the training group (before: 13.5±2.1kPa, after: 10.6±2.1kPa); however, such a reduction was not observed in the control group. There was no significant group (control and training groups)×time (before and after the intervention) interaction for the shear modulus of the soleus. The drop jump performance for the training group improved, while the rate of torque development did not change. Relative changes in these measurements were not correlated with each other in the training group. These results suggest that drop jump training decreases the passive stiffness in the medial gastrocnemius, and training-induced improvement in explosive performance cannot be attributed to change in passive muscle stiffness.Ryosuke AndoShinya SatoNaoya HirataHiroki TanimotoNaoto ImaizumiYasuhiro SuzukiYasuhiro SuzukiKosuke HirataKosuke HirataKosuke HirataRyota AkagiRyota AkagiFrontiers Media S.A.articlepassive muscle stiffnessgastrocnemiussoleusrate of torque developmentdrop jumpelastographyPhysiologyQP1-981ENFrontiers in Physiology, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	passive muscle stiffness gastrocnemius soleus rate of torque development drop jump elastography Physiology QP1-981
spellingShingle	passive muscle stiffness gastrocnemius soleus rate of torque development drop jump elastography Physiology QP1-981 Ryosuke Ando Shinya Sato Naoya Hirata Hiroki Tanimoto Naoto Imaizumi Yasuhiro Suzuki Yasuhiro Suzuki Kosuke Hirata Kosuke Hirata Kosuke Hirata Ryota Akagi Ryota Akagi Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance
description	Passive muscle stiffness is positively associated with explosive performance. Drop jump training may be a strategy to increase passive muscle stiffness in the lower limb muscles. Therefore, the purpose of this study was to examine the effect of 8-week drop jump training on the passive stiffness in the plantar flexor muscles and the association between training-induced changes in passive muscle stiffness and explosive performance. This study was a randomized controlled trial. Twenty-four healthy young men were divided into two groups, control and training. The participants in the training group performed drop jumps (five sets of 20 repetitions each) 3days per week for 8weeks. As an index of passive muscle stiffness, the shear moduli of the medial gastrocnemius and soleus were measured by shear wave elastography before and after the intervention. The participants performed maximal voluntary isometric plantar flexion at an ankle joint angle of 0° and maximal drop jumps from a 15cm high box. The rate of torque development during isometric contraction was calculated. The shear modulus of the medial gastrocnemius decreased for the training group (before: 13.5±2.1kPa, after: 10.6±2.1kPa); however, such a reduction was not observed in the control group. There was no significant group (control and training groups)×time (before and after the intervention) interaction for the shear modulus of the soleus. The drop jump performance for the training group improved, while the rate of torque development did not change. Relative changes in these measurements were not correlated with each other in the training group. These results suggest that drop jump training decreases the passive stiffness in the medial gastrocnemius, and training-induced improvement in explosive performance cannot be attributed to change in passive muscle stiffness.
format	article
author	Ryosuke Ando Shinya Sato Naoya Hirata Hiroki Tanimoto Naoto Imaizumi Yasuhiro Suzuki Yasuhiro Suzuki Kosuke Hirata Kosuke Hirata Kosuke Hirata Ryota Akagi Ryota Akagi
author_facet	Ryosuke Ando Shinya Sato Naoya Hirata Hiroki Tanimoto Naoto Imaizumi Yasuhiro Suzuki Yasuhiro Suzuki Kosuke Hirata Kosuke Hirata Kosuke Hirata Ryota Akagi Ryota Akagi
author_sort	Ryosuke Ando
title	Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance
title_short	Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance
title_full	Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance
title_fullStr	Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance
title_full_unstemmed	Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance
title_sort	relationship between drop jump training–induced changes in passive plantar flexor stiffness and explosive performance
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/31b7cc06886c4a249fa10b0c0aee8344
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Relationship Between Drop Jump Training–Induced Changes in Passive Plantar Flexor Stiffness and Explosive Performance

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